This is a partial list of the British Air Ministry (AM) specifications for aircraft. A specification stemmed from an Operational Requirement, abbreviated "OR", describing what the aircraft would be used for. This in turn led to the specification itself, e.g. a two-engined fighter with four machine guns. So for example, OR.40 for a heavy bomber led to Specification B.12/36. Aircraft manufacturers would be invited to present design proposals to the ministry, following which prototypes of one or more of the proposals might be ordered for evaluation. On very rare occasions, a manufacturer would design and build an aircraft using their own money as a "private venture" (PV). This would then be offered to the ministry for evaluation. The ministry may well release a specification based on the private venture aircraft if the plane aroused interest from the RAF or the ministry due to its performance or some other combination of features.[1]

The system of producing aircraft to a specification ran from 1920 to 1949 during which the Air Ministry was replaced by first the Ministry of Aircraft Production (MAP) in 1940 and then the Ministry of Supply (MoS) in 1946. The system was applied to commercial aircraft as well, two being the de Havilland Comet and Vickers Viscount. During the period, over 800 specifications were issued.[1]

Specification designations

Each specification name usually followed a pattern. A leading letter was usually present to identify the aircraft purpose. The codes used included B for "heavy bomber", e.g., B.12/36, P for "medium bomber", e.g., P.13/36, F for "fighter", e.g., F.10/35, and A for "army co-operation", e.g., A.39/34. The second part was a number identifying it in sequence and then after the slash, the year it was formulated, so in the example given above, B.12/36 signifies a specification for a heavy bomber, the twelfth specification of all types issued in 1936. Specifications were not always issued in sequence.[1]

Admiralty specifications were identified by the letter N (Naval), e.g., N.21/45, and experimental specifications identified by the letter E (Experimental), e.g., E.28/39, with training aircraft signified by the letter T (Training), e.g., T.23/31, and unpowered aircraft, signified by the letter X, e.g., X.26/40. The letter G (General) signified a general-purpose aircraft, e.g., G.9/45, with an M (Multi-role) being applied to aircraft intended for more than one specific purpose, e.g., M.15/35.[1]

The letter C (Cargo) was applied to military transport aircraft, e.g., C.1/42, with the letter O (Observation) used for a naval reconnaissance aircraft, e.g., O.8/38 – the letter S (Spotter) used for the more specialised role of naval spotting, i.e., observing and reporting back the fall of naval gunfire, e.g., S.38/34 – and R (Reconnaissance) for a reconnaissance type – often a flying boat, e.g., R.3/33. Special purpose aircraft would be signified by a letter Q, this being used to specify aircraft such as target-tugs, radio-controlled target drones, etc., e.g., Q.32/55.[1]

Sometimes the purpose for which an aircraft is used in service would change from that for which the specification to which it was designed was issued, and so there are some discrepancies and inconsistencies in designation, the Royal Navy in particular liking to specify multiple roles for its aircraft in an attempt to make the best use of the necessarily limited hangar space onboard its aircraft carriers. In this case this resulted in several types designed to specifications originally intended to signify the naval Spotting role also being used for other purposes, e.g., S.15/33, resulting in the Blackburn Shark and Fairey Swordfish, the latter aircraft being primarily utilised as a torpedo bomber. Similarly S.24/37, which produced the Fairey Barracuda, again primarily designed for spotting, the dive bomber/torpedo bomber requirements being regarded as secondary when the specification was issued, but for which roles it was almost exclusively subsequently used, the original spotting requirement having been made obsolete with the introduction of radar.[1]

In addition, some (mostly early) specifications appear to have no letter prefix at all, e.g., 1/21, the Vickers Virginia III.[1]

List of specifications (incomplete)

The names of the aircraft shown in the table are not necessarily those they carried when provided for evaluation as at this point an aircraft would usually be referred to as the Manufacturer X.XX/XX, e.g., the Avro B.35/46 – this is in addition to the manufacturer's own separate internal designation for the aircraft, e.g., Avro 698. With several manufacturers submitting designs to the same specification this could result in a number of different aircraft with the same X.XX/XX designation, e.g., Handley Page B.35/46, etc.[1] Upon acceptance of the design(s) the final service names would usually be chosen by the Air Ministry when they placed a production order, in the above B.35/46 cases, where two aircraft were accepted to this specification, Vulcan and Victor respectively.[1]

Upon entering service, in the absence of any already-planned variants a new type would initially have no mark number after the aircraft name, being simply referred to as the Manufacturer Service-name, e.g., the Avro Anson, however upon acceptance of a new variant the previous (initial) version automatically became the 'Mark I', so in the example given, the previous (first) version of the Anson retrospectively became the Avro Anson Mk I upon acceptance of an Avro Anson Mk II. Sometimes planned variants would be later cancelled leading to 'missing' mark numbers, or the extent of the changes may have justified given the new variant a completely new name, e.g., the Hawker Typhoon II subsequently becoming the Hawker Tempest, or the Avro Lancaster B.IV & B.V entering service as the Avro Lincoln. In a few cases the same aircraft ordered with differing engines would be allocated separate names for each variant, e.g., Hawker Typhoon and Hawker Tornado, or the Handley Page Hampden and Handley Page Hereford. Typographical designation of mark numbers (Mk.) varied over time and inconsistencies are common, e.g., Mark II, Mk. II, II, etc. Initially Roman numerals were used, changing to Arabic numerals post-World War II, e.g., Supermarine Spitfire Mk I to Supermarine Spitfire Mk 24.[1]

Note 1: where possible mark numbers are given here in this list in the form that was used at the time of acceptance. Variations may be encountered due to changes in format/typographical convention.

Note 2: due to mergers and amalgamations within the UK aircraft industry sometimes the name of the manufacturer changed over time, e.g., English Electric later became part of the British Aircraft Corporation (BAC), so the English Electric Lightning then became the BAC Lightning; the British Aircraft Corporation itself and Hawker Siddeley (HS) then later merged and became British Aerospace, subsequently becoming BAe (now BAE Systems). Thus the previously mentioned Avro Vulcan was subsequently referred to as the Hawker Siddeley Vulcan; similarly, the Blackburn Buccaneer later became the Hawker Siddeley Buccaneer. Where possible, for clarity the aircraft in this list are listed under the ORIGINATING company's name or the name of the manufacturer under which it first entered production.

Specifications within the tables are listed in numerical order by year of issue; where a given number appears more than once, with one or more letter prefixes, the entries are presented in alphabetical order.

Air Board specifications (1917–1918)

In 1917, the Air Board began to issue specifications for new aircraft on behalf of the Royal Flying Corps and Royal Navy Air Service,[2] with separate series for the RFC and Navy.[1][3]

RFC series[1]
Spec Type Designs
A.1A Single-seat fighter – Sopwith Camel replacement[4] Austin Osprey,[5] Boulton & Paul Bobolink,[4] Nieuport B.N.1,[6] Sopwith Snipe[7]
A.1C Single-seat fighter – ABC Dragonfly engine, became RAF Type I specification.[8] Nieuport Nighthawk
A.2B Single- or twin-engined day bomber[9] Airco DH.10 Amiens
A.3C Heavy bomber – superseded by RAF Type V[10] Abandoned
Royal Navy Air Service series
Spec Type Designs
N.1A Single seat land or ship-based fighter.[11] Beardmore W.B.IV,[12] Beardmore W.B.V,[13] Mann Egerton Type H[11]
N.1B Single-seat seaplane or flying boat fighter[14] Blackburn N.1B,[15] Norman Thompson N.1B,[2] Supermarine Baby,[15] Westland N.1B,[16] Wight Triplane Flying Boat[2]
N.1B Single seat torpedo bomber[17] Blackburn Blackburd,[18] Short Shirl[17]
N.2A Two-seat floatplane scout[19] Fairey N.9,[20] Fairey N.10,[21] Short N.2A[19]
N.2B Two-seat floatplane bomber, 600 lb (270 kg) bombload.[22] Fairey IIIB,[22] Short N.2B[23]
N.2C Twin engined patrol flying boat[24] Norman Thompson N.2C

RAF specifications (1918–1920)

Data from: The British Aircraft Specifications File[1]
Spec Type Designs
Type I Fighter, ABC Dragonfly engine.[8] Armstrong Whitworth Ara, BAT Basilisk, Nieuport Nighthawk,[8] Siddeley Siskin,[25] Sopwith Snapper,[26] Sopwith Snark[27]
Type IA Long-distance (high altitude) BAT Bantam, Westland Wagtail
Type II Two-seat fighter Bristol Badger
Type III Two-seat fighter Austin Greyhound, Westland Weasel
Type IV
Type VI		 Twin-engined bomber Avro 533 Manchester, Boulton Paul Bourges, de Havilland DH.11 Oxford, Sopwith Cobham
Type VII Night Bomber Nieuport London
Type VIII Bomber Avro 533 Manchester, Boulton Paul Bourges, Bristol Braemar, de Havilland DH.11 Oxford, Sopwith Cobham
Type IX Medium bomber de Havilland Okapi
Type XI Heavy bomber Siddeley Sinaia
Type XX Gloster Nightjar
Type XXI Two-seat amphibian fighter Bristol Type 35, Fairey Pintail
Type XXII Single-seat carrier based torpedo bomber (re-issued 1920) Blackburn Blackburd, Short Shirl, 'Blackburn Swift'
Type XXX Flying boat[2] Short Cromarty, Vickers Valentia
Type XXXII Prototype training seaplane[28] (cancelled 1918) – Short Sporting Type produced to this specification
Type XXXIII Four-engined long range flying boat[2] Fairey N.4

1920–1929

Data from: The British Aircraft Specifications File[1]
Spec OR Type Designs
1/20 None First spec. issued: spares carrier Bristol Type 37 Tramp
2/20 'Interim' single-engine heavy bomber Avro Aldershot, de Havilland DH.27 Derby
3/20 Single-seat deck-landing torpedo-carrier – Spec. superseded by 32/22 (q.v.) Blackburn Dart (modified), Handley Page H.P.19 Hanley
4/20 Long-distance photographic and reconnaissance aeroplane Boulton & Paul Bolton
5/20 Troop Carrier Biplane Bristol Type 56, Vickers Victoria
6/20 Vimy Ambulance Vickers Vimy Ambulance
7/20 Fleet reconnaissance and fleet spotting amphibian[2] Supermarine Seal II
8/20 Three-seat reconnaissance aircraft for Army/Navy Armstrong Whitworth Tadpole, Westland Walrus
9/20 Medium range postal monoplane Parnall Possum, Boulton & Paul Bodmin
10/20 Cantilever monoplane de Havilland Doncaster
11/20 Medium Range Military Conversion of Postal Aeroplane Parnall Possum, Boulton & Paul Bodmin
1/21 Long-range bomber – Vickers Vimy replacement Vickers Virginia III
2/21 Experimental single-seat convertible biplane/monoplane fighter/interceptor/two-seat reconnaissance-fighter aircraft – written for Bullfinch Bristol Bullfinch
3/21 Naval Fleet spotter/reconnaissance aircraft Avro Bison, Blackburn Blackburn
4/21 Small troop carrier Vickers Vernon
5/21 Light day bomber – Airco DH.9A replacement Fairey Fawn
6/21 Postal aeroplane Westland Dreadnought
7/21 Single-Seat Ship Fighter Parnall Plover
8/21 Torpedo aeroplane Blackburn T.4 Cubaroo
9/21 Torpedo aeroplane Blackburn Dart production
10/21 Corps reconnaissance aircraft Armstrong Whitworth Wolf, Hawker Duiker
11/21 Vimy ambulance Vickers Vimy ambulance
12/21 Fleet spotting flying boat[29] English Electric Ayr[2]
13/21 Cantilever Monoplane Handley Page H.P.20
14/21 Felixstowe F.5 replacement[30] Supermarine Scylla
13/21 Cantilever monoplane Handley Page H.P.20
14/21 Boat seaplane Supermarine Scylla
15/21 Twin-engined bomber Boulton & Paul P.19
16/21 Biplane transport Handley Page W.8b
17/21 Biplane transport Handley Page Type X, de Havilland DH.34
18/21 Passenger transport Handley Page HP.18 Hanley / Handley Page HP.21 Hanley, de Havilland DH.32, Vickers Type 61 Vulcan
19/21 Two-seat reconnaissance aircraft – Bristol F.2B Fighter replacement Short Springbok
20/21 High-altitude fighter cancelled
21/21 Spotting amphibian Supermarine Seagull II[2]
22/21 Reconditioned F.2b Bristol F.2b Fighter
1/22 Passenger Aeroplane Vickers Type 170 Vanguard
2/22 Amphibians for use in the Middle East Vickers Viking V[2]
3/22 Two-seat fighter/reconnaissance powered by a supercharged engine – Bristol Fighter replacement Bristol Type 84 Bloodhound
4/22 Reconditioning of DH.10 Airco DH.10 Amiens
5/22 Spare wing de Havilland DH.29 Doncaster
6/22 Naval carrier fighter with interchangeable wheel and float undercarriages using Armstrong Siddeley Jaguar or Bristol Jupiter engine – Nieuport Nightjar replacement Fairey Flycatcher, Parnall Plover
7/22 Army reconnaissance aircraft Hawker Duiker
8/22 Corps reconnaissance aircraft Armstrong Whitworth Wolf
9/22 New tail unit and trial de Havilland DH.29 Doncaster
10/22 Metal-winged DH.9a Airco DH.9a
11/22 Reconditioning of DH.9a Airco DH.9a
12/22 Single-engined goods carrier Vickers Type 63 Vulcan
13/22 Reconditioning of Snipe Sopwith Snipe
14/22 High performance landplane Armstrong Whitworth Siskin III
15/22 Modifications to Hanley Handley Page HP.19 Hanley II
16/22 Long range torpedo bomber to carry 21 inch torpedo Blackburn Cubaroo, Avro 557 Ava
17/22 Amphibian floatplane Not proceeded with
18/22 Amphibian seaplane Not proceeded with
19/22 Night bombing landplane Not proceeded with
20/22 Coast patrol seaplane English Electric P.5 Cork[2]
21/22 Twin-engined amphibian flying boat for civil operations[31] – see also R.18/24[32] Supermarine Swan
22/22 Two-seat fighter/reconnaissance powered by a supercharged engine – Bloodhound three aircraft order – revised from 3/22 (q.v.) Bristol Type 84 Bloodhound
23/22 Amphibian floatplane Not proceeded with
24/22 Amphibian seaplane Not proceeded with
25/22 Single-seat night interceptor fighter Hawker Woodcock
26/22 Cantilever Monoplane for Civil Purposes Not proceeded with
27/22 Three-engined Mail Carrying Landplane Not proceeded with
28/22 Rebuilding and Modification of the Doncaster De Havilland DH.29 Doncaster
29/22 Postal Monoplane Westland Dreadnought
30/22 Boulton & Paul Bugle
B.30/22 Heavy bomber – written for Bugle II production order but Sidestrand also apparently designed to this spec. Boulton & Paul Bugle II, Boulton Paul Sidestrand
31/22 Four-seat heavy night-bomber Handley Page Hyderabad
32/22 Single-seat deck-landing torpedo-carrier – Spec. supersedes 3/20 (q.v.) Blackburn Dart II, Bristol Brandon
37/22 Three-seat deck landing reconnaissance aircraft – Blackburn Blackburn / Avro Bison replacement Avro Type 550, Blackburn Airedale, Hawker Hedgehog
38/22 General purpose seaplane/landplane Fairey IIID
40/22 Transport aeroplane – civil airliner – larger version of de Havilland DH.34 de Havilland Highclere
41/22 'Middle East type transport aeroplane' – civil airliner Armstrong Whitworth Argosy, de Havilland Hercules
43/22 Vickers Vernon II
44/22 Single-engined long-range reconnaissance seaplane – intended for round-the-World flight Fairey Fremantle
46/22 Three-seat fleet-spotter amphibian[33] Vickers Vanellus
9/23 Superseded by 14/24[2] Blackburn Iris
13/23 Supermarine Seagull II[2]
16/23 None Spotting ship-plane Avro Bison
19/23 Fighter/interceptor – improved Siskin III Armstrong Whitworth Siskin IIIA
21/23 Fleet two-seat torpedo bomber Avro Buffalo, Blackburn Ripon, Handley Page H.P.31 Harrow
23/23 Coastal patrol and anti-submarine flying-boat English Electric Kingston[2]
25/23 Fleet two-seat torpedo bomber/bomber Handley Page H.P.25 Hendon
26/23 Two-seat long-range day-bomber Bristol Berkeley, Handley Page H.P.28 Handcross, Hawker Horsley, Westland Yeovil
28/23 Long-range bomber – Virginia production order Vickers Virginia
37/23 Single-engined fighter/interceptor – improved Grebe Gloster Gamecock
38/23 Twin-engined Night Bombing Landplane Vickers Vimy
39/23 Single-engined Single-Seater Racing Seaplane Gloster II
40/23 Single-engined Single-Seater Racing Seaplane Supermarine S.4
41/23 Fitting of Handley Page Slotted Wings to the Bristol Fighter Aircraft Bristol F.2B
42/23 Amphibian Alighting Gear for Fairy Flycatcher I Fairey Flycatcher
43/23 Special Wings to Aerofoil Section of R&M 322 for Blackburn Dart Blackburn Dart
44/23 Light Aeroplane De Havilland DH.53 Humming Bird
45/23 Two-seater Fighter Reconnaissance Landplane Vickers Venture
1/24 Three-seat fleet reconnaissance seaplane and amphibian Parnall Pike, Short S.6 Sturgeon, Bristol Type 87
2/24 Light aeroplane Cancelled
3/24 Single-seat high-performance landplane Hawker Woodcock II (production)
4/24 "Twin-Engined Home Defence Fighter" armed with two 37 mm cannons Westland Westbury Bristol Bagshot
5/24 Advanced landplane, convertible to a seaplane, trainer for RAF and deck-landing trainer for FAA Cancelled, replaced by 5A/24
5A/24 Floatplane trainer Vickers Vendace, Blackburn Sprat, Parnall Perch
6/24 Single-seat fighter Fairey Flycatcher (production)
7/24 'High powered single-seater fighter landplane' Avro Avenger, Fairey Firefly I, Fairey Fox, Gloster Gorcock, Hawker Hornbill
8/24 Army co-operation aircraft de Havilland Dingo
9/24 Twin engine medium day-bomber – Sidestrand II production order – see also 25/27 Boulton Paul Sidestrand II
10/24 Fleet spotting ship-plane Blackburn Blackburn
11/24 Fleet spotting ship-plane Avro Bison II
12/24 Long-range bomber – Virginia production order Vickers Virginia
13/24 Patrol flying boat Blackburn Iris III, Short Singapore
14/24 Three-engined boat seaplane Blackburn Iris, Saunders Valkyrie
15/24 Four-seat heavy night-bomber – initial production batch of Hyderabads Handley Page Hyderabad I
16/24 Submarine-borne reconnaissance seaplane Parnall Peto
17/24 Single-seat high-speed fighter landplane Gloster Guan
18/24 Twin-engined amphibian flying boat – military version of boat ordered to 21/22 Supermarine Southampton
19/24 Three-seat spotter/reconnaissance (Fleet Air Arm)/two-seat GP (Royal Air Force) aircraft with interchangeable land & float U/C and folding wings Fairey IIIF
20/24 All-metal monoplane flying boat Beardmore Inverness
21/24 Single-seat boat seaplane for storage in restricted space Parnall Prawn
22/24 Three-engine boat seaplane Saunders Valkyrie
23/24 Twin engine civil airliner Handley Page H.P.32 Hamlet
24/24 Conversion of Bison I to Bison Ia Avro Bison
25/24 Single-seater, high-speed fighter landplane Hawker Heron
26/24 Three-engined land-plane for duties in the Middle East Cancelled
27/24 Twin engine single-seat interceptor/night fighter Boulton Paul Bittern
28/24 Day and night fighter – Armstrong Whitworth Siskin replacement Armstrong Whitworth Starling
29/24 Twin-engined boat amphibian with Lynx engines (service aircraft) Supermarine Seamew
30/24 Two-seat reconnaissance/army co-operation aircraft de Havilland Hyena, Short Chamois, Vickers Vespa
31/24 Twin-engined boat amphibian with Lynx engines (civil aircraft) Saunders Medina
32/24 Training landplane with Lynx engines – replaced by 3/27 Avro 504N
33/24 Three-engined boat seaplane for civil use Not issued
34/24 Freight carrying landplane Vickers Vellore, Gloucester Goodwood
35/24 Three-engine landplane for Middle East transport Armstrong Whitworth Argosy
11/25 Reconnaissance flying boat Supermarine Southampton (production)
12/25 Two-seater fleet reconnaissance aircraft Cancelled
13/25 Troop carrier Vickers Victoria III (production)
14/25 Demonstration flight of Cierva Autogiro Cierva C.6A
17/25 Naval single-seater fighter of all-metal stressed-skin construction with interchangeable wheel and float U/C powered by Lynx engine Avro 584 Avocet, Vickers Vireo
20/25 Army co-operation aeroplane – Bristol Fighter/DH.9A replacement Armstrong Whitworth Atlas, Bristol Boarhound
23/25 Two-seat day-bomber, reconnaissance & coastal torpedo-bomber Blackburn Beagle, Gloster Goring, Handley Page H.P.34 Hare, Hawker Harrier, Westland Witch
24/25 High altitude bomber – Hawker Horsley replacement Blackburn Beagle, Handley Page H.P.34 Hare, Vickers Vildebeest
7/26 Twin-float high-speed monoplane seaplane for 1927 Schneider Trophy competition Short Crusader
F.9/26 None Day and night 'zone' fighter – no design accepted and Spec. superseded by F.20/27 (q.v.) Armstrong Whitworth Starling II, Blackburn Blackcock / Turcock, Boulton Paul Partridge, Bristol Bulldog Mk.I, Bristol Bullpup, Gloster Goldfinch, Gloster SS.18, Hawker Hawfinch, Vickers Type 141
10/26 Long-range bomber – Virginia production order Vickers Virginia
12/26 Fast two-seat day bomber of all-metal construction using Rolls-Royce F.XIB engine Avro Antelope, Hawker Hart, Fairey Fox IIM
14/26 Passenger flying boat Short Calcutta
21/26 Naval Fleet fighter – see also N.21/26 Parnall Pipit, Vickers Type 141, Vickers Type 177
N.21/26 Naval Fleet fighter – see also 21/26 Armstrong Whitworth Starling II, Armstrong Whitworth A.W.16, Blackburn Blackcock/Turcock, Fairey Firefly III, Gloster Gnatsnapper, Hawker Hoopoe, Vickers Type 177
O.22/26 Naval high-speed, two-seat, Fleet fighter/reconnaissance Blackburn Nautilus, Fairey Fleetwing, Handley Page H.P.37F, Hawker Osprey, Short Gurnard
R.4/27 Maritime patrol flying boat Saunders Severn
R.5/27 Reconnaissance flying boat Blackburn Sydney
8/27 Long-range bomber – Virginia production order Vickers Virginia
F.10/27 Single-seat fighter armed with six machine guns Saunders A.10
B.19/27 Twin engine night-bomber – Virginia/Hinaidi replacement – Hendon winner but introduction delayed so runner-up (Heyford) accepted Avro 557 Ava, Fairey Hendon, Handley Page Heyford, Vickers Type 150, Vickers Type 163, Vickers Type 195, Vickers Type 225, Bristol Type 108
C.20/27 Transport version of Handley Page Hyderabad / Handley Page Hinaidi – Chitral/Clive Handley Page Clive
F.20/27 'Interception single-seat fighter' to overtake in shortest time an enemy aircraft flying at 150 mph at 20,000 ft[34] Armstrong Whitworth Starling II, Bristol Bulldog Mk.II, de Havilland DH.77, Fairey Firefly II, Hawker Fury, Saunders A.10, Vickers Jockey, Westland Interceptor
B.22/27 Three engine night-bomber – abandoned due to delays and replaced by B.19/27 (q.v.) Boulton Paul P.32, de Havilland DH.72 Canberra
25/27 Twin engine medium day-bomber – Sidestrand II production order – see also 9/24 Boulton Paul Sidestrand II
26/27 General purpose aircraft – D.H.9A replacement Bristol Beaver, de Havilland Hound, Fairey Ferret, Gloster Goral, Vickers 131 Valiant, Vickers Venture, Vickers Vixen, Westland Wapiti
F.29/27[35] Fighter utilizing a 37 mm cannon from Coventry Ordnance Works to meet similar requirements as F.20/27[36] Vickers Type 161, Westland C.O.W. Gun Fighter, Bristol Type 112
33/27 'Postal Aircraft' – experimental very-long range aeroplane for world distance-record attempt Fairey Long-range Monoplane
M.5/28 Torpedo bomber – Spec superseded by M.1/30 (q.v.) Handley Page H.P.41
R.6/28 Patrol/reconnaissance flying boat Short Sarafand
8/28 Racing seaplane for 1929 Schneider Trophy using Rolls-Royce R engine, for use by RAF High Speed Flight Supermarine S.6
13/28 Long-range bomber – Virginia production order Vickers Virginia
C.16/28 Bomber-transport capable of carrying 30 fully armed troops, or their equivalent in cargo or bombs, for a distance of 1,200 mi (1,900 km) nonstop Gloster TC.33, Handley Page H.P.43, Vickers Type 163, Bristol Type 115, Bristol Type 116
F.17/28 Bulldog II production order Bristol Bulldog Mk.II
21/28 High-speed mailplane for Imperial Airways Boulton & Paul Mailplane, Boulton Paul P.71A
1/29 General purpose aircraft (for production) Westland Wapiti
2/29 Two-seat carrier-borne torpedo-bomber (for production) Blackburn Ripon IIA
3/29 Troop transport aircraft Handley Page Clive II
4/29 Ab initio trainer – Moth with de Havilland Gipsy I order de Havilland Gipsy Moth
5/29 Elementary trainer (for production) Hawker Tomtit
6/29 General purpose landplane Blackburn C.A.15C, Boulton & Paul P.42, Westland Limousine V
7/29 Troop carrying aeroplane (for production) Vickers Victoria V
8/29 Single-seat fighter (for production) Armstrong Whitworth Siskin IIIA
9/29 Day bomber (for production) Hawker Hart
10/29 Medium day-bomber (for production) Boulton Paul Sidestrand III
11/29 Day and night fighter (for production) Bristol Bulldog IIA
12/29 Spotter reconnaissance aeroplane for the Fleet Air Arm (for production) Fairey IIIF
13/29 Heavy night-bomber (for production) Handley Page Hinaidi II
14/29 Army co-operation aircraft Cancelled
15/29 General purpose aircraft Cancelled
16/29 Experimental tailless aircraft Westland-Hill Pterodactyl IV
17/29 All-metal torpedo-bomber (for development and production) Hawker Horsley
18/29 General reconnaissance flying boat – military version of Short S.8 Calcutta Short Rangoon

1930–1939

Spec OR Type Designs
M.1/30 Torpedo bomber – Spec. supersedes M5/28 (q.v.) Blackburn M.1/30, Handley Page H.P.46, Vickers Type 207
2/30 Dual control conversion set issued to Blackburn but then cancelled
3/30 Basic trainer – Avro 504N replacement Avro Type 621 Trainer
5/30 Mail carrier Vickers Type 166 Vellore II
6/30 ab initio trainer – Lynx-Avro (Avro 504N) production order Avro 504N
F.7/30 OR.1[37] Fighter capable of at least 250 mph and armed with four machine guns Blackburn F.3, Bristol Type 123, Bristol Type 133, Gloster Gladiator, Gloster SS.19, Hawker P.V.3, Supermarine Type 224, Westland F.7/30
8/30 ab initio trainer – Moth with Gypsy II order de Havilland Moth
S.9/30 Two-seat carrier-borne torpedo bomber/three-seat spotter-reconnaissance aircraft Fairey T.S.R.I, Gloster FS.36; see also S.15/33
16/30 Naval fighter – written for Nimrod Hawker Nimrod
18/30 Fairey IIIF replacement Fairey Gordon I
19/30 Naval fighter/reconnaissance with folding wings and interchangeable wheel/float U/C Hawker Osprey
G.4/31 OR.2[37] General-purpose/torpedo bomber – Wapiti & Gordon replacement – Wellesley one of two designs submitted by Vickers and itself a PV – see also G.22/35 Blackburn B-7, Bristol Type 120, Fairey G.4/31, Handley Page H.P.47, Hawker P.V.4, Parnall G.4/31, Vickers G.4/31, Vickers Wellesley, Westland PV-7
5/31 Long-range bomber – Virginia production order Vickers Virginia
13/31 ab initio trainer with complete freedom for parachute escape by both occupants – D.H.60T accepted with modifications, becoming D.H.82 – see also T.23/31 (some sources give 13/31 as an order for the Ripon IIC) Avro Type 631 Cadet, de Havilland D.H. 60T Tiger Moth
18/31 Basic trainer – Avro Type 621 Trainer with Lynx engine Avro Tutor
R.19/31 Three-engined long-range reconnaissance flying boat – Rangoon three-aircraft production order Short Rangoon
R.20/31 Twin-engined flying boat – all-metal Kestrel-engined Southampton II (Southampton IV/Scapa) Supermarine Scapa
T.23/31 Tiger Moth I production order de Havilland Tiger Moth I
R.24/31 OR.3[37] "General Purpose Open Sea Patrol Flying Boat" Saunders Roe London, Short R.24/31 Knuckleduster, Supermarine Stranraer
C.26/31 OR.4[37] Bomber-transport – Valentia replacement Armstrong Whitworth A.W.23, Bristol Bombay, Handley Page H.P.51. Vickers Type 230 – (not built)
B.9/32 OR.5[37] Twin-engine medium day bomber with appreciably higher performance than predecessors – later revised to specify Goshawk power and subsequently re-revised with Goshawk requirement dropped Vickers Wellington(renamed from 'Crecy'), Handley Page Hampden, Bristol Type 131
S.11/32 OR.6[37] Naval catapult observation/spotting seaplane for carriage on cruisers Fairey Seafox
T.12/32 Trainer Bristol Type 124
19/32 Conversion of Westland Wapiti into Westland Wallace standard Westland Wallace
20/32 Three-engined long-range reconnaissance flying boat – improved Iris with Buzzard engines Blackburn Perth
25/32 Basic trainer – revised-Tutor production order Avro Tutor I
B.23/32 Twin-engine medium bomber – written for Heyford I & IA production order Handley Page Heyford Mk. I/IA
P.27/32 OR.7[37] Light day bomber – Hart/Hind replacement – see P.23/35 Armstrong Whitworth A.W.29, Fairey Battle, Gloster P.27/32, Bristol Type 136
R.1/33 Patrol/reconnaissance flying boat Westland-Hill Pterodactyl Mk.VII
R.2/33 OR.8[37] Long-range patrol/reconnaissance flying boat Short Sunderland, Saro A.33
R.3/33 Long-range patrol/reconnaissance flying boat – trials order for Singapore III Short Singapore III
F.5/33 OR.9[37] Twin-engine two-seat turret fighter – later cancelled Armstrong Whitworth A.W.34, Boulton Paul P.76, Bristol Type 140, Gloster F.5/33, Parnall F.5/33, Westland-Hill Pterodactyl Mk.V
T.6/33 Tiger Moth floatplane two aircraft evaluation order de Havilland Tiger Moth
13/33 4-engined mail seaplane and 4-engine flying boat carrier – Short-Mayo Composite Short S.20 Mercury, Short S.21 Maia
14/33 Fairey Gordon II production order Fairey Gordon II
S.15/33 OR.10[37] Naval carrier-borne torpedo bomber/spotter/reconnaissance (TSR) – Fairey 9/30 (q.v.) design modified and re-submitted as T.S.R.II – Spec. replaces S.9/30 & M.1/30 (q.v.) Blackburn Shark, Fairey Swordfish, Gloster TSR.38
18/33 Radio-controlled Fleet gunnery target aircraft de Havilland Queen Bee
21/33 Three-seat general purpose/Army co-operation aircraft – Fairey IIIF/Wapiti replacement – improved Vildebeest Vickers Vildebeest
F.22/33 OR.11[37] Fighter Bristol Type 141
G.23/33 General purpose aeroplane – Hart for Middle East Hawker Hardy
24/33 Gloster Gauntlet production order Gloster Gauntlet
25/33 Twin-engined troop and cargo transport – improved Victoria Vickers Valentia
T.26/33 Tiger Moth II production order de Havilland Tiger Moth II
B.29/33 Twin engine medium day bomber with power-operated nose turret Boulton Paul Sidestrand V (Overstrand)
1/34 Two-seat Army Co-operation Fighter Bomber for the Royal Australian Air Force[38] Hawker Demon
2/34 High-altitude research aircraft capable of reaching 50,000 ft Bristol Type 138A
B.3/34 OR.12[37] Heavy bomber landplane,[38] twin-engine night bomber & bomber/transport – Virginia, Heyford & Hendon replacement – transport requirement later removed after protests from manufacturers Armstrong Whitworth Whitley, Bristol Type 144
P.4/34 OR.13[39] Light day bomber for tactical support[38] Fairey P.4/34, Hawker Henley
F.5/34 OR.14[39] Single-seat fighter[38] (although contracts were placed for prototypes with three companies none were ordered into production)[38] Bristol Type 146, Martin-Baker M.B.2, Vickers Type 279 Venom, Gloster F.5/34
6/34 Single-engine biplane amphibian for Australia.[38] Supermarine Seagull V
G.7/34 Two-seat general purpose light bomber,[38] Interim Hart day bomber replacement Hawker Hind
8/34 Two-seat interceptor fighter[38] (production of Demon I for the RAF[38]) Hawker Demon
9/34 Two-seat day bomber and army co-operation aircraft[38] (production of Hawker Audax[38]) Hawker Audax
10/34 Hawker Hart communications aircraft (two aircraft delivered to No. 24 Squadron RAF[38]) Hawker Hart
11/34 Torpedo spotter reconnaissance aircraft development[38] (One Fairey Seal fitted with an Armstrong Siddeley Panther VI engine[38]) Fairey Seal
12/34 Torpedo spotter reconnaissance aircraft development[38] (production of 16 Sharks for use by No. 820 Squadron RAF[38]) Blackburn Shark
13/34 Bulldog trainer production[38] (production of Bulldog TM Type 124[38]) Bristol Bulldog
R.14/34 Singapore III production order[38] Short Singapore III
15/34 Three-seat torpedo bomber[38] (production of Mk III[38]) Vickers Vildebeest
16/34 Three-seat general purpose aircraft – Vincent I production order including conversion of outstanding Vildebeests to Vincents Vickers Vincent I
17/34 Torpedo bomber[38] (additional Baffin T.8A aircraft for conversion training, three built[38]) Blackburn Baffin
18/34 Single-engine day bomber[38] (Hawker Hart IB production[38]) Hawker Hart
19/34 Two-seat Army co-operation aircraft[38] (production of Audax Is for use in India, 50 aircraft built[38] Hawker Audax
B.20/34 Twin-engine night bomber – Hendon production order to this spec – see also B.19/27 Fairey Hendon
21/34 Two-seat fleet spotter reconnaissance aircraft[38] (Osprey III production[38]) Hawker Osprey
22/34 Close-support aircraft – Audax for SAAF Hawker Hartebeest
B.23/34 Twin engine medium day bomber – Overstrand production order Boulton Paul Overstrand
24/34 Basic trainer – production order for second batch of definitive Tutor design – see 3/30, 18/31 & 25/32 Avro Tutor I
25/34 Amphibian trainer[38] (production of three Clouds[38]) Saro Cloud
26/34 Float seaplane trainer[38] (production of 16 Tutors for the Seaplane Training School[38]) Avro Type 646 Sea Tutor
O.27/34 OR.15[39] Naval dive bomber Blackburn Skua
B.28/34 Twin-engine medium bomber – written for Heyford II production order Handley Page Heyford Mk. II
29/34 Hawker Fury for the South African Air Force[38] Hawker Fury
30/34 Twin-engined troop and cargo transport – Valentia I production order Vickers Valentia I
31/34 Armoured day bomber (development of armoured crew protection for the Hart[38]) Hawker Hart
32/34 Navigation trainer – Prefect production order Avro 626/Prefect
F.36/34 OR.16[39] High Speed Monoplane Single Seater Fighter (based on the Hawker submission to F.5/34)[38] Hawker Hurricane
F.37/34 OR.17[39] High Speed Monoplane Single Seater Fighter (based on the private venture Supermarine Type 300 submission)[38] Supermarine Spitfire
S.38/34 Written for Swordfish production order Fairey Swordfish I
A.39/34 OR.18[39] Two-seat Army co-operation aeroplane Bristol Type 148, Westland Lysander
B.1/35 OR.19[39] Twin-engine heavy bomber Airspeed A.S.29, Boulton Paul P.79, Armstrong Whitworth A.W.39, Handley Page H.P.55, Vickers Warwick[40]
2/35 Naval catapult-launched observation/spotting flying boat for carriage on cruisers Supermarine Walrus
F.9/35 OR.20[39] Two-seat four-gun turret fighter – Demon replacement Hawker Hotspur, Boulton Paul Defiant, Bristol Type 147
F.10/35 Drawn up for the Spitfire prototype Supermarine Spitfire
13/35 Naval torpedo-spotter-reconnaissance aircraft – written for Shark production order Blackburn Shark
14/35 Army Co-operation aircraft – Audax replacement Hawker Hector
F.14/35 Written for Gladiator I initial production order Gloster Gladiator I
M.15/35 Land-based general reconnaissance/torpedo-bomber Blackburn Botha, Bristol Beaufort
16/35 Autogyro – written for Cierva C.30/Avro 671 Rota evaluation order Avro Rota
18/35 Twin-engined coastal reconnaissance landplane – written for Anson Avro Anson
20/35 Radio-controlled Fleet gunnery target aircraft – Queen Bee production order de Havilland Queen Bee
B.21/35 Twin-engine medium bomber – written for Whitley II production order Armstrong Whitworth Whitley II
G.22/35 General-purpose day and night bomber and coastal-defence torpedo-carrier – Wellesley production order – see also G.4/31 Vickers Wellesley
P.23/35 Written for Battle I production order Fairey Battle I
G.24/35 General Reconnaissance – Anson replacement Bristol Type 149, Bristol Beaufort
26/35 Naval fighter/reconnaissance – Osprey IV production order Hawker Osprey IV
B.27/35 Twin-engine medium bomber – written for Heyford III production order Handley Page Heyford Mk. III
B.28/35 Drawn up for Bristol 142M Bristol Blenheim
B.29/35 Written for Harrow initial production order Handley Page Harrow
O.30/35 Naval turret-fighter – fighter development of Skua accepted Blackburn Roc, Boulton Paul P.85
Q.32/35 Radio-controlled Fleet Gunnery target aircraft – Queen Bee replacement Airspeed Queen Wasp
F.34/35 Twin-engined turret-armed fighter Gloster F.34/35
F.35/35 Very high speed fighter Airspeed A.S.31, General Aircraft GAL.28, Bristol Type 151, Hawker Hurricane variant (none built)[41]
36/35 Trans-Atlantic mail plane de Havilland Albatross
F.37/35 OR.31 Fighter with cannon Westland Whirlwind, Hawker Hurricane with Oerlikon cannon, Supermarine Type 313, Bristol Type 153
39/35 Twin-engine communications aircraft – Envoy with dorsal turret order for SAAF Airspeed Envoy
R.1/36 OR.32 Small reconnaissance flying boat Saro Lerwick, Blackburn B-20
2/36 Development of the Cierva C.30 (cancelled)
3/36 Development of the Avro 652A (cancelled)
4/36 Catapult bomber (cancelled) Short S.27
5/36 OR.33 Improved Walrus for the Fleet Air Arm Supermarine Walrus
T.6/36 OR.34 Advanced monoplane trainer mounting manually operated dorsal turret – Don accepted but proved unsuitable de Havilland Don, Miles Kestrel
M.7/36 Torpedo Spotter Reconnaissance aircraft (cancelled) Fairey Albacore
O.8/36 OR.36 Reconnaissance dive bomber for the Fleet Air Arm (cancelled)
S.9/36 Three-seat spotter fighter for the Fleet Air Arm (cancelled) Fairey S.9/36
10/36 OR.38 Written for Beaufort production order Bristol Beaufort I
11/36 OR.39 Interim General Reconnaissance – aircraft later renamed 'Blenheim IV' and 'Bolingbroke' name transferred to Canadian-built Blenheim Bristol Bolingbroke I
B.12/36 OR.40 Four-engine heavy bomber 250 mph cruise, 1500 mile range, 4000 lb bomb load[42] Armstrong Whitworth B.12/36, Short Stirling, Supermarine Type 316
P.13/36 OR.41 Twin-engined medium bomber for "world-wide use"[note 1] introduction delayed due to production difficulties necessitating further order of Whitleys & Wellingtons[note 2] Avro Manchester (2 prototypes ordered), Handley Page H.P.56 (two prototype ordered), Hawker P.13/36 (project only), Vickers Warwick with Rolls-Royce Vulture engines.
14/36 Production specification for the Fairey Battle I Fairey Battle (500 ordered later reduced to 311)
F.15/36 Written for Hurricane redesigned for Merlin II Hawker Hurricane I
17/36 Written for Hotspur initial production order – later cancelled Hawker Hotspur; cancelled
19/36 Naval torpedo-spotter-reconnaissance aircraft – written for Shark additional production order Blackburn Shark
B.20/36 Twin-engine medium bomber – written for Whitley III production order Armstrong Whitworth Whitley III
T.23/36 Multi-role crew trainer Airspeed Oxford
25/36 Written for Skua initial production order Blackburn Skua
26/36 Written for Roc initial production order Blackburn Roc
29/36 Written for Wellington (revised Crecy from B.9/32) initial production order Vickers Wellington I
B.30/36 Written for Hampden initial production order Handley Page Hampden I
33/36 Written for Blenheim I production order (Rootes) Bristol Blenheim I
36/36 Written for Lysander initial production order Westland Lysander I
37/36 Written for Walrus additional production order Supermarine Walrus I
39/36 Written for Botha additional production order (Boulton Paul) – cancelled Blackburn Botha
T.40/36 OR.44 Development and production of a trainer version of the Miles Hawk Miles Magister
S.41/36 Three-seat torpedo/spotter-reconnaissance aircraft – Swordfish replacement Fairey Albacore
42/36 Target tug – order for Henley target tug conversions by Gloster's Hawker Henley III
43/36 Autogyro Cierva C.40 Rota II
B.44/36 Written for Dagger-Hampden (Hereford) production order Handley Page Hereford I
45/36 Written for Botha additional production order (Blackburn) – cancelled Blackburn Botha
47/36 Written for Bombay II production order Bristol Bombay II
T.1/37 Basic trainer Heston T.1/37 Trainer, Miles M.15, Parnall Heck III, Airspeed A.S.36 (not built)
2/37 Written for Blenheim I production order (Avro) Bristol Blenheim I
6/37 Twin-engine VIP transport aircraft – order for The King's Flight Airspeed Envoy
Q.8/37 Radio-controlled Fleet Gunnery target aircraft – Queen Bee replacement – role subsequently carried-on by Queen Wasp – see Q.32/35 Airspeed A.S.37 (not built)
F.9/37 OR.49 Twin-engine day/night fighter Gloster G.39
F.11/37 Twin-engine two-seat day & night fighter/ground support Boulton Paul P.92
F.18/37 Heavily armed interceptor armed with 12 x 0.303 mgs and capable of at least 400 mph Bristol F.18/37, Gloster F.18/37, Hawker Tornado, Hawker Typhoon, Supermarine Type 324, Supermarine Type 325
19/37 Written for Manchester I production order Avro Manchester I
20/37 Written for Roc floatplane production order Blackburn Roc
S.23/37 OR.52 Four-engine carrier-based Fleet shadower/follower – low-speed, high-endurance, ship-tracking aircraft – requirement later rendered obsolete due to introduction of radar Airspeed AS.39, General Aircraft GAL.38
S.24/37 OR.53 Naval torpedo/dive-bomber, reconnaissance – Supermarine entry featured variable-incidence wing Supermarine S.24/37, Fairey Barracuda
32/37 Written for Halifax initial production order Handley Page Halifax I Srs 1 – I Srs 3
B.32/37 OR.44 Production contract for a four-engine version of the P.13/36 H.P.56 design Handley Page H.P.57 Halifax
F.36/37 Gladiator II production order Gloster Gladiator II
37/37 Magister I production order Miles Magister I
38/37 Three-seat communications aircraft & instrument/wireless trainer Miles Mentor
T.39/37 Three-seat communications aircraft & instrument/wireless trainer Airspeed AS.42 Oxford for the Royal New Zealand Air Force
42/37 Specification for wooden mockup of Miles X2 large transport aeroplane – not built – lead to Miles M.30X Minor scale testbed Miles M.30X Minor
43/37 Engine testbed Folland Fo.108; designs also tendered by General Aircraft & Percival
S.7/38 Naval catapult-launched observation/spotting flying boat – Walrus replacement Supermarine Sea Otter
O.8/38 Naval carrier-borne fighter/observation – winner developed from Fairey's earlier P.4/34 entry Fairey Fulmar
B.9/38 Twin-engine medium bomber of simple construction using materials other than light alloy wherever possible see B.17/38 and B.18/38[43]
14/38 Long-range pressurised high-altitude monoplane transport/airliner (Shorts) – 3 prototypes ordered, construction started – cancelled Short S.32
15/38 Short/Medium-range monoplane transport/airliner (Fairey) – Fairey FC.1, 14-aircraft production order – cancelled Fairey FC1, General Aircraft GAL.40
16/38 Trainer – Master I production order Miles Master T.Mk.I
B.17/38 Twin-engine medium bomber of mixed wood/metal construction Bristol Type 155 (cancelled by Bristol)[43]
B.18/38 Twin-engine medium bomber of mixed wood/metal construction Armstrong Whitworth Albemarle[43]
B.19/38 Bomber with 8,000 lb load and eight 20mm cannon in two turrets – revised to become B.1/39 Bristol Type 157
20/38 Communications aircraft – Vega Gull order Percival Vega Gull
21/38 Communications aircraft – Dominie production order de Havilland Dominie
S.22/38 Naval helicopter Cierva C.41 Gyrodyne
24/38 Twin-engine communications aircraft – Envoy production order Airspeed Envoy
25/38 Twin-engine communications aircraft Percival Petrel
26/38 OR.65 Three-seat wireless or navigation training aircraft with dual controls – Vega Gull adapted for communications training Percival Proctor I
28/38 OR.66 Two-seat helicopter – written for Weir W.6 Weir W.6
T.29/38 Twin-engine R/T (Radio Telephony) training aircraft – Dominie three aircraft order de Havilland Dominie
B.1/39 "Ideal Bomber" four-engined heavy bomber with 9,000 lb bomb load and 20mm cannon defence (revised B.19/38) – work suspended June 1940[44] Handley Page H.P.60, Bristol Type 159, a Gloster submission, Armstrong Whitworth AW.68
T.4/39 OR.68 Single-engined trainer Airspeed Cambridge – (two prototypes ordered, no production contract)
R.5/39 Long-range patrol flying boat – Sunderland replacement – superseded by R.14/40 (q.v.) Saunders-Roe S.38 – later cancelled
N.8/39 Naval two-seat carrier-borne fighter – Roc replacement – replaced by N.5/40 see N.5/40
N.9/39 Naval two-seat carrier-borne fighter – Fulmar replacement – replaced by N.5/40 see N.5/40
F.17/39 Long-range fighter development of Bristol Beaufort – written for Beaufighter Bristol Beaufighter
F.18/39 Fighter – Hurricane/Spitfire replacement Martin-Baker M.B.3, Martin-Baker M.B.5
19/39 Twin-engine transport aircraft – order for Hertfordshire later cancelled de Havilland Hertfordshire
20/39 Twin-engine communications aircraft – order for No. XXIV Squadron RAF de Havilland Flamingo
21/39 Twin-engine VIP transport aircraft – order for The King's Flight de Havilland Flamingo
F.22/39 OR.76 Fighter fitted with heavy-calibre nose-mounted gun Vickers 414 Vickers Type 432 – also tests with Vickers Type 439 testbed – specification later cancelled
B.23/39 Very high altitude version of Wellington capable of operating at 40,000 ft Vickers Wellington V
E.28/39 Experimental aircraft using Whittle jet-propulsion with provision for 4 × 0.303 machine guns Gloster E.28/39

1940–1949

Spec OR Type Designs
B.1/40 OR.78 Twin-engine fast bomber carrying no defensive armament de Havilland Mosquito
F.1/40 Air observation post (AOP) Fane F.1/40, General Aircraft GAL.47[45]
2/40 OR.79 Twin-engined trainer aircraft Caproni Ca 311, Caproni Ca 313
F.2/40 Fighter using Whittle jet-propulsion (Metrovick) – written for Meteor – see also F.9/40 Gloster Meteor II
B.3/40 OR.80 High speed bomber Blackburn B.28[46]
F.4/40 OR.81 High-altitude fighter – superseded by F.7/41 (q.v.) Westland Welkin
N.5/40 OR.82 Naval 2-seat Fleet reconnaissance/fighter Fairey Firefly
B.6/40 OR.83 Twin-engine day/close support bomber – later renamed Blenheim V Bristol Bisley
B.7/40 OR.84 Medium Bomber replacement for Blenheim bomber development of Beaufighter[47] A design by Armstrong Whitworth not taken further Bristol Beaumont accepted but not built, led to Buckingham (q.v.)[48]
8/40 OR.85 Ambulance Aircraft Airspeed Oxford
F.9/40 OR.86 Fighter using Whittle jet-propulsion (Rover/Rolls-Royce) – written for Meteor – see also F.2/40 Gloster Meteor I
X.10/40 OR.87 Troop-carrying glider capable of carrying 7 troops General Aircraft Hotspur I; cancelled after eighteen built – redesigned Hotspur II relegated to training – see X.22/40 & X.23/40
N.11/40 OR.88 Naval single-seat Fleet fighter powered by Napier Sabre – see also S.8/43 Blackburn Firebrand F.I, Hawker P.1009 "Fleet Fighter"
S.12/40 OR.89 Naval catapult-launched observation/spotting flying boat – Walrus & Sea Otter replacement – superseded by S.14/44 (q.v.) Supermarine Type 381
R.13/40 OR.90 General-purpose flying boat Blackburn B-40
R.14/40 OR.91 Very long range reconnaissance flying boat – Centaurus-engined Sunderland replacement Saunders-Roe S.41, Short Shetland
15/40 OR.92 Conversion of Supermarine Spitfire for Photographic Development Unit Supermarine Spitfire
F.16/40 High-altitude fighter Vickers Type 432
17/40 OR.94 Very high altitude bomber – Wellington V production order Vickers Wellington V
F.18/40 OR.95 Night fighter with turret Gloster F.18/40, fulfilled by de Havilland Mosquito NF.II[49]
F.19/40 Low-cost emergency production fighter Miles M.20/2
B.20/40 "Close Army Support Bomber" with Merlin engine able to dive bomb and photoreconnaissance De-navalised version of Fairey Barracuda offered but specification not proceeded with.[46]
F.21/40 OR.96 Fighter version of Mosquito de Havilland Mosquito F.II
X.22/40 Troop-carrying training glider – Hotspur II production order General Aircraft Hotspur II
X.23/40 Troop-carrying training glider – Hotspur II further production order General Aircraft Hotspur II
T.24/40 Training aircraft Airspeed A.S.50 (not built)
X.25/40 OR.98 Troop-carrying glider capable of carrying 14 troops Slingsby Hengist
X.26/40 OR.99 Troop-carrying glider of wooden construction capable of carrying between 24 and 36 fully armed troops Airspeed Horsa
X.27/40 OR.100 Tank-carrying heavy glider capable of carrying 7-ton load General Aircraft Hamilcar
E.28/40 OR.101 Experimental research aircraft for deck landings – cancelled 1943 Folland Fo.115, Folland Fo.116 (ordered but not completed)[50]
F.29/40 Twin-engined night fighter to cover the Gloster "Reaper" development of F.9/37 (cancelled May 1941)[49]
N.1/41 OR.102 Naval fighter Miles M.20/4
B.2/41 Twin-engine bomber – Blenheim replacement – written for redesigned Bristol Type 162 Beaumont. Changes in requirements and availability of superior aircraft led to type no longer being needed Bristol Buckingham (adapted for courier duties as C.1)
X.3/41 OR.104 Emergency Tallboy-carrying conversion of Horsa for attack on Tirpitz – later cancelled when Lancaster was modified to carry Tallboy Airspeed A.S.52 Horsa
F.4/41 Spitfire with Griffon engine – written for Spitfire IV but amended to include Mk. XXI redesign. Preceded in introduction by Mk.s XII & XIV – some overlap with F.1/43 (q.v.) Supermarine Spitfire XXI
B.5/41 OR.106 Pressurised high-altitude bomber – evolved into B.3/42 (q.v.) Pressurised version of the Vickers Warwick III
E.6/41 OR.107 Experimental jet fighter – DH Spider Crab de Havilland Vampire
F.7/41 OR.108 High-altitude fighter – revised from F.4/40 (q.v.) Vickers Type 432, Westland Welkin
B.8/41 Four-engined heavy bomber – see also B.3/42 Short S.36, Vickers Windsor
T.9/41 Four-seat radio trainer. Percival Proctor IV
F.10/41 OR.109 Written for Hawker Tempest a.k.a. "Thin-Wing Typhoon" Hawker Tempest
B.11/41 OR.110 High-speed high-altitude unarmed bomber de Havilland DH.99, Hawker P.1005, Miles M.39
12/41 Target tug Miles Martinet
C.1/42 OR.113 Interim transport aircraft – cargo version of Lancaster – York I production order Avro York I
N.2/42 OR.114 Single-seat boat fighter Blackburn B-44
B.3/42 OR.115 High-performance long-range bomber Vickers Windsor
B.4/42 High performance bomber (Mosquito replacement) – Cancelled
5/42 Glider for RAAF De Havilland Australia DHA-G2
E.5/42 Experimental single-engined jet fighter – later cancelled – see E.1/44 Gloster GA.1
E.6/42 Experimental lightweight Tempest – written for Tempest Light Fighter – refined & re-issued as F.2/43 (q.v.) Hawker Fury – see F.2/43
F.6/42 Single-seat fighter Boulton Paul P.99, Boulton Paul P.100, Hawker Type P.1018, Hawker Type P.1019, Hawker Type P.1020, Folland Fo.117a, Miles M.42, Miles M.43, Miles M.44
H.7/42 OR.117 Torpedo bomber – Beaufighter replacement Bristol Brigand
R.8/42 OR.118 Long-range patrol/reconnaissance flying boat – Sunderland with Hercules engines Short Sunderland IV/Seaford
Q.9/42 OR.119 Twin engine target tug – planned production of Monitor later cancelled – see also Q.1/46 'Miles Monitor TT Mk.1
10/42 "Special Rotating Wing Glider" used to identify the Hafner Rotabuggy
11/42 "Special Rotating Wing Glider" used to identify the Hafner Rotachute
F.1/43 OR.120 Development of Spitfire with Griffon & laminar flow wing. Supermarine Spiteful
F.2/43 OR.121 Written for Tempest Light Fighter Hawker Fury; cancelled at conclusion of hostilities.
TX.3/43 OR.122 Two-seat side-by-side seating training glider General Aircraft G.A.L.55
N.4/43 OR.113 Carrier-based fighter – Seafire with Griffon engine Supermarine Seafire XV
O.5/43 OR.144 Torpedo bomber – Barracuda replacement Fairey Spearfish
S.6/43 Torpedo Bomber Reconnaissance Aircraft (Cancelled) Armstrong Whitworth A.W.53
N.7/43 Carrier-based fighter – revised as N.22/43 (q.v.) Hawker Sea Fury
S.8/43 OR.124 Naval single-seat Fleet fighter capable of carrying rockets, torpedo or bombs – Firebrand powered by Centaurus – see also N.11/40 Blackburn Firebrand TF.III
F.9/43 OR.125 Two-seat high-altitude night fighter Westland Welkin NF.II
Q.10/43 Radio-controlled Fleet Gunnery target aircraft – Queen Wasp replacement Miles Queen Martinet
S.11/43 OR.146 Naval carrier-borne attack/strike aircraft – later cancelled – Sturgeon also submitted to Q.1/46 & M.6/49 (q.v.) Armstrong Whitworth A.W.54, Short Sturgeon
F.12/43 OR.126 Long-range fighter for Far East – written for Hornet de Havilland Hornet
T.13/43 OR.148 Advanced trainer Bristol Buckmaster
B.14/43 Heavy bomber for Far East Avro Lincoln, Handley Page H.P.65
15/43 OR.151 Medium Range Civil Transport Aircraft Handley Page Hermes
E.16/43 Experimental helicopter with powered tilting hub controlled rotor with automatic collective pitch control, and torque reaction control using jet efflux. Cierva W.9
A.17/43 OR.145 Army liaison and VIP transport aircraft – Messenger I production order Miles Messenger I
C.18/43 Stop-gap airliner version of Stirling Short S.37 Stirling
F.19/43 OR.127 Folland design to be built by English Electric
20/43 OR.142 Two-seat training glider suitable for ATC cadets Slingsby Kirby Cadet TX Mk.1
T.21/43 OR.153 Trainer version of Fairey Spearfish Fairey Spearfish T. Mk 1
N.22/43 OR.155 Revision of N.7/43; carrier-based fighter Hawker Sea Fury
T.23/43 OR.131 Trainer – all-weather fully aerobatic three-seater Percival Prentice
E.24/43 Experimental jet research aircraft capable of 1,000 mph and able to reach 36,000 ft in 1 and 1/2 minutes Miles M.52; cancelled 1946
25/43 Brabazon IIA – Civil Transport for European service Airspeed Ambassador
C.26/43 (26/43) Brabazon VB – Light Civil Air Transport De Havilland Dove
B.27/43 OR.149 Heavy bomber – developed Halifax Handley Page HP.66 and HP.69 – cancelled with end of war.[51][note 3]
S.28/43 OR.150 Firebrand replacement Blackburn B-48 YA.1/Firecrest
29/43 Airliner version of Lancaster IV – see also B.14/43 Avro Tudor
E.1/44 OR.157 Experimental Nene-powered jet fighter Gloster GA.2
2/44 Brabazon Committee Type I Long range transatlantic airliner Bristol Brabazon I, Miles X-11 (not built)
C.3/44 Long-range general-purpose transport – York replacement Handley Page Hastings
X.4/44 OR.160 Tank-carrying heavy glider capable of carrying 7-ton load and returning under its own power General Aircraft Hamilcar X
N.5/44 OR.162 Naval carrier-version of Hornet de Havilland Sea Hornet
E.6/44 OR.170 Written for Saro SR.44 flying-boat jet fighter Saro SR.A/1
N.7/44 OR.167 Carrier-based fighter – navalised version of Spitfire F Mk.21 Supermarine Seafire F Mk.45
PR.8/44 Photoreconnaissance version of the Bristol Buckingham Specification cancelled
E.9/44 Flying wing jet bomber/airliner Armstrong Whitworth A.W.52
E.10/44 OR.182 RAF (land) variant of Nene-powered jet fighter prototype Supermarine Attacker
N.11/44 OR.174 Naval long-range carrier-based fighter with Eagle 22 piston engine capable of accepting a turboprop at a later date – RN version of F.13/44 (q.v.) – see also N.12/45 Westland Wyvern
12/44 Medium range civil transport aircraft Handley Page Hermes II
F.13/44 OR.194 Long-range fighter with Eagle 22 piston engine capable of accepting a turboprop at a later date – RAF version of N.11/44 (q.v.) – see also N.12/45 Westland Wyvern, Hawker P.1027/P.1030
S.14/44 OR.89 Naval land-based ASR Supermarine Seagull ASR-1
N.15/44 OR.189 Naval carrier-version of Mosquito de Havilland Sea Mosquito TR.33
16/44 Stop-gap airliner version of Lancaster Avro Lancastrian C.Mk 1
17/44 Medium-short haul passenger aircraft – stop-gap airliner version of Wellington Vickers Wellington Transport Aircraft
18/44 Brabazon Committee Type Va Civil feederliner Miles Marathon
19/44 Civil transport version of the Avro York C1 Avro York
20/44 Jet civil transport (de Havilland DH.106) Not issued
O.21/44 Twin-Merlin engined Fairey Spearfish Specification cancelled
22/44 Transport aircraft – mixed passenger, freight/passenger or all-freight high-payload/short-distance – see also G.9/45 Bristol Wayfarer/Freighter
E.1/45 OR.195 Naval variant of Nene-powered jet fighter prototype Supermarine Attacker (Royal Navy)
A.2/45 OR.176 Army air observation post (AOP) – replacement for Taylorcraft Auster AOPs Auster A.2/45, Heston A.2/45
B.3/45 OR.199 Two-seat twin-engine high-altitude fast jet bomber carrying no defensive armament – Mosquito replacement – revised from E.3/45 (q.v.) English Electric Canberra B.1 – see also B.5/47
B.3/45 Experimental two-seat twin-engine high-altitude fast jet bomber carrying no defensive armament – Mosquito replacement – reissued as B.3/45 (q.v.) English Electric Canberra
A.4/45 OR.164 Army three-seat light communications aircraft – Leonides-powered Pioneer II later accepted 1950 Scottish Aviation Pioneer I
N.5/45 Naval carrier-borne variant of Supermarine Spiteful Supermarine Seafang
T.7/45 OR.159 Three-seat advanced trainer using turboprop engine – Harvard replacement – replaced by T.14/47 (q.v.) Avro Athena T.1, Boulton Paul Balliol T.1
TX.8/45 OR.180 Tandem-seat training glider for Air Training Corps Slingsby T.24 Falcon 4
C.9/45 OR.192 Military transport aircraft capable of carrying a 3 ton load into jungle areas – see also 22/44 Bristol Wayfarer/Freighter
F.11/45 Naval jet fighter – DH Vampire for sea trials – cancelled de Havilland Vampire Mk X
N.12/45 OR.213 Long-range carrier-based fighter – Wyvern with Python turboprop engine – see also F.13/44 & N.11/44 Westland Wyvern S.4
C.13/45 High speed military transport aircraft Airspeed Ayrshire
GR.14/45 Maritime reconnaissance aircraft – Vickers project, cancelled.
C.15/45 Long range transport aircraft Handley Page H.P.72
N.16/45 Twin-engined strike aircraft – Three aircraft ordered from Fairey but not built. Fairey N.16/45,
GR.17/45 OR.220 Carrier-borne ASW Blackburn B-54/B-88, Fairey Gannet
E.18/45 OR.207 Experimental aircraft – Single-engine jet aircraft for use as an aerodynamic testbed for tail less design. De Havilland DH.108
Q.19/45 OR.204 Mosquito target tug de Havilland Mosquito TT.39
E.20/45 OR.221 Experimental helicopter – see also E.34/46 Bristol Type 171
N.21/45 OR.226 Naval carrier-borne two-seat night fighter de Havilland Sea Hornet NF.21
Q.1/46 OR.225 Naval target tug de Havilland Mosquito TT.39, Miles Monitor, Short Sturgeon TT.1,
2/46 Brabazon Committee Type I Long range transatlantic airliner – Brabazon II (Coupled Proteus) order Bristol Brabazon II
C.3/46 Medium-range tactical transport General Aircraft Ltd. 65 Universal Freighter
N.3/46 Naval helicopter Cierva Air Horse
E.4/46 Experimental gyrodyne Fairey Gyrodyne
R.5/46 OR.200 Four engine long-range Maritime patrol bomber – Liberator GR replacement Avro Shackleton
E.6/46 OR.216 Experimental long range aircraft – variant of the Avio Lincoln Avro 689
N.7/46 OR.218 Naval carrier-borne interceptor/fighter bomber Hawker Sea Hawk
C.9/46 All-round air transport – military version of Viking Vickers Valetta C.Mk.1
N.11/46 Two-seat trainer version of Sea Fury Hawker Sea Fury T.20
B.14/46 OR.239 Four engine jet medium bomber – later used as insurance against delay of aircraft submitted to B.35/46 Short Sperrin
C.16/46 Brabazon Committee Type IIB Short-medium range turboprop airliner carrying 24–30 passengers Armstrong Whitworth A.W.55 Apollo, Handley Page H.P.76, Handley Page H.P.77, Handley Page H.P.78, Vickers Viscount
E.19/46 Experimental helicopter for crop spraying Cierva Air Horse
22/46 Brabazon Committee Type IV Jet-propelled trans-atlantic mail plane/jet airliner – MoS order for two Comet prototype/production aircraft de Havilland Comet
26/46 Brabazon Committee Type II Short-range feederliner – Dragon Rapide replacement de Havilland Dove
E.27/46 OR.241 Experimental aircraft for investigation into delta wing characteristics at transonic speeds Boulton Paul P.111
X.30/46 Assault glider Shorts S.48 / S.A.9
PR.31/46 OR.223 Photo Reconnaissance version of B.3/45 English Electric Canberra PR3
E.34/46 OR.242 Experimental helicopter – see also E.20/45 Bristol Sycamore
B.35/46 OR.229 Four engine swept-wing jet medium bomber with a cruising speed of 500 kt and a ceiling of at least 55,000 ft Armstrong Whitworth A.W.56, Avro Vulcan, Bristol Type 172, de Havilland DH.111, Handley Page Victor, Short PD.1; Designs also submitted by Vickers & English Electric
E.38/46 OR.243 Experimental aircraft for investigation into the controllability and stability of swept wings at low speeds. Hawker P.1052
N.40/46 OR.246 Naval carrier-borne jet fighter – see also F.4/48 de Havilland DH.110
E.41/46 Experimental swept-wing version of Attacker – evolved into Swift Supermarine 510, Supermarine Swift
R.42/46 Marine Reconnaissance Landplane (Avro Shackleton MR.III replacement) – cancelled Avro Shackleton MR.IV
F.43/46 OR.228 Interceptor with 4.5 inch recoilless gun using Rolls-Royce AJ.65 or Metrovick F.9 axial engines – superseded by F.3/48 (q.v.) Gloster P.234, Gloster P.248, Gloster P.250, Hawker P.1054, Supermarine Type 508 variant
F.44/46 OR.227 Two-seat twin-engined night/all weather fighter see F.24/48 & F.4/48
T.1/47 OR.238 Two-seat trainer version of Meteor – written around Gloster's civil Meteor demonstrator G-AKPK Gloster Meteor T.7
C.2/47 Brabazon Committee Type III Airliner – medium-range Empire transport Bristol Britannia, Handley Page H.P.83, Handley Page H.P.84, Handley Page H.P.85, Handley Page H.P.86
F.3/47 Fighter – Vampire with wing strengthened for carriage of underwing stores de Havilland Vampire F.Mk.3
B.5/47 OR.235 Three-seat twin-engine high-altitude fast jet bomber carrying no defensive armament – Mosquito replacement – revised from B.3/45 (q.v.) to include visual bombing requirement English Electric Canberra B.2
A.6/47 Two-seat Army Helicopter Bristol Type 171
E.8/47 OR.250 Experimental one-half scale research version of Bristol Type 172 four-jet long-range bomber design – later revised for reconfigured Type 176 – all subsequently cancelled Bristol Type 174
N.9/47 OR.254 Naval carrier-borne jet fighter/research aircraft Supermarine Type 508, Supermarine Type 529
E.10/47 OR.252 Experimental research jet Fairey Delta 1
T.14/47 OR.159 Two-seat advanced trainer using Merlin 35 – replacement for T.7/45 (q.v.) Avro Athena T.2, Boulton Paul Balliol T.2
E.1/48 Small Jet Propelled Helicopter (not-built) Isacco Helicogyre No. 5
R.2/48 OR.231 Reconnaissance flying boat, updated and renumbered as R.112D in 1950s but cancelled. Expected order for PD.2 suspended[52][53] Blackburn B-78,[note 4] Saunders-Roe P.104/Saunders-Roe P.162, developed Short Shetland Short PD.2, Supermarine 524
F.3/48 OR.228 Written for P.1067, replaced F.43/46. 630 mph at 45,000 ft in 6 minutes. Single Avon or Sapphire engine, armed with two or four 30 mm Aden cannon.[54] Hawker P.1067 (Hawker Hunter), Bristol Type 177, Gloster P.275, Supermarine Type 526[55]
F.4/48 OR.227 Two-seat twin-engined night/all weather fighter – replacement for Vampire NFs de Havilland DH.110, Gloster Javelin
5/48 Long Range Empire Aircraft (cancelled) Avro 709, Blackburn B-73, Fairey FC.4
E.6/48 no OR Experimental research aircraft using one-third scale version of Handley Page B.35/46 wing design Handley Page HP.88
E.7/48 Experimental unmanned target aircraft powered by turbojet engine – Queen Martinet replacement Government Aircraft Factory Jindivik
T.8/48 OR.260 ab initio trainer – Tiger Moth replacement – written for Chipmunk T.10 production order de Havilland Chipmunk T.10
B.9/48 OR.231 Four engine jet medium bomber – less advanced stop-gap for B.35/46 designs – written around Valiant Vickers Valiant
10/48 Twin-engine crop sprayer (cancelled) Cierva W.11T
11/48 Production of Avro Tudor IVB civil aircraft (cancelled)
T.12/48 Trainer – two-seat Wyvern conversion trainer Westland Wyvern T.3
T.13/48 OR.249 Trainer – multi-engine – replacement for Wellington T.Mk 10 Vickers Varsity T.Mk 1
S.14/48 NAR.21, OR.264 Naval version of the Sikorsky S-51 Westland Dragonfly
E.15/48 no OR Experimental one-third scale low-speed research version of Avro's B.35/46 design Avro 707
T.16/48 OR.257 Trainer – Prentice replacement Avro 714, Handley Page H.P.R.2, Percival Provost, Boulton Paul P.115, Boulton Paul P.116
T.17/48 OR.260 Primary Elementary Trainer Fairey Primer
B.22/48 OR.302 Pathfinder version of Canberra English Electric Canberra B.5
F.24/48 OR.265 Two-seat twin-engined night/all weather fighter – interim stop-gap for F.4/48 – Meteor NF development originally to F.44/46 (q.v.) Armstrong Whitworth Meteor NF.11
T.1/49 OR.269 Navigation / AI trainer Vickers Type 743 Valetta T.3
T.2/49 OR.244 Dual-control training version of Canberra English Electric Canberra T.4
T.3/49 Flying classroom Avro Anson – cancelled
E.4/49 Experimental aircraft for B.9/48 Vickers Type 663 Tay Viscount
F.5/49 Long range fighter for RAF
M.6/49 OR.275 / NRA/9 Light carrier-borne ASW – written around Short Sturgeon variant – spec derived from GR.17/45 Short S.B.3
7/49 not issued
N.8/49 NRA/18 Naval strike aircraft de Havilland DH.109 cancelled
A.9/49 OR.274 Army / RAF evacuation helicopter Bristol Sycamore HC.10 & Bristol Sycamore HC.11 prototypes
E.10/49 Experimental – additional order for Avro 707s including side-by-side seating conversion-trainers – these later cancelled – see also E.15/48 Avro 707
E.11/49 Experimental – flying shell of B.35/46 cancelled
12/49P Proposed production of B.5/47 by English Electric cancelled
A.13/49 OR.281 Army helicopter Saunders-Roe Skeeter
N.14/49 NA/A.14 Naval carrier-borne all-weather strike fighter – see also N.40/46 & F.4/48 de Havilland Sea Vixen
F.15/49 OR.277 Jet fighter – interim Vampire replacement de Havilland Venom
E.16/49 OR.282 Swept-wing Mach 2 research aircraft Armstrong-Whitworth AW.58
T.17/49 NR/A20 & OR.283 Crew trainer for Royal Navy / FAA Percival Sea Prince T.1
C.18/49 NR/A15 & OR.283 Communication aircraft Percival Sea Prince C.1
19/49P Transport – Hastings C.2 order Handley Page Hastings C.2
A.20/49 OR.270 Air observation post aircraft Auster AOP.9, Percival O.68 and Percival P.69 tendered
A.20/49 Issue 2 Production Auster AOP.9 Auster AOP.9
21/49 Medium range passenger transport Vickers VC.2 Type 630 Viscount
U.22/49 high speed pilotless target aircraft and launching ramp GAF Jindivik II – cancelled
F.23/49 OR.268 Supersonic jet fighter/interceptor English Electric P.1 & English Electric P.1A
F.23/49 Issue 2 OR.268 Issue 1 Three prototype supersonic jet fighter/interceptor aircraft English Electric P.1B Lightning
F.23/49 Issue 3 OR.268 Issue 4 Three prototype supersonic jet fighter/interceptor aircraft English Electric P.1B Lightning
F.23/49 Issue 4 OR.268 Issue 6 20 pre-production supersonic jet fighter/interceptor aircraft English Electric P.1B Lightning
F.23/49 Issue 5 outline Specification for proposed German version English Electric P.1B Lightning
23/49P OR.268 Issue 6 Fifty production supersonic jet fighter/interceptor aircraft English Electric Lightning F.1 & English Electric Lightning F.1A
23/49P.2 OR.268 Issue 6 Forty two production supersonic jet fighter/interceptor aircraft English Electric Lightning F.2
23/49P.3 Forty seven production supersonic jet fighter/interceptor aircraft + 3 prototypes converted from a pre-prod a/c and two F.2s English Electric Lightning F.3
H.24/49 Air ambulance helicopter (cancelled) Fairey FB-1 Gyrodyne
U.25/49 Small low speed pilotless target aircraft and launching pad (cancelled replaced by U.120D)
26/49 Replacement for the de Havilland Rapide (cancelled) Blackburn B-84, Folland Fo 134
E.27/49 Configuration Research for F.23/49 (Cancelled and replaced with ER.100) Short SB.5
F.28/49 Development of E.38/46 (P.1052) for Australian government. Hawker P.1052

Post 1949 specifications. Air Staff Operational Requirements/targets

Spec OR Year Type Related aircraft
 ER.100 1950 Experimental low-speed research aircraft with highly-swept wings in support of F23/49 (i.e. English Electric P.1) Short SB.5[56]
 M.101 NA.28 1950, 1952 Three-seat anti-submarine aircraft Fairey Firefly AS.7[57]
 N102 1950 Two-seat trainer for Royal Navy Boulton Paul Sea Balliol[58]
 ER.103 1950 Delta-wing research aircraft capable of Mach 1.5 Fairey Delta 2[58]
 B.104 OR.285 1950 Low-level, medium-range Pathfinder aircraft for Bomber Command Vickers Valiant B.2[59]
 F.105D OR.288/2 1951 Swept wing day-fighter development of E41/46 (qv.) for RAF Supermarine Swift[59]
 F.105D2 High performance derivative of Supermarine Swift Supermarine Type 545[60]
 F.105P2 OR.288/3 1951 Production of Supermarine Swift Marks 1–4 Supermarine Swift[60]
 N.105D&P NA.34 1952 Navalised version of Supermarine Swift Supermarine Type 548[61]
 FR.105D&P OR.308 1952 Fighter-reconnaissance version of Supermarine Swift Supermarine Swift FR.5[62]
 PR.105D&P OR.310 1952 Medium/high-altitude reconnaissance version of Supermarine Swift Supermarine Swift PR.6[62]
 F.105D&P3 1953 Supermarine Swift armed with Fairey Fireflash air-to-air missiles Supermarine Swift F.7[63]
 H.106 1951 General purpose helicopter – update of E.34/46 (qv.) Bristol Sycamore Mark 3[64]
 A.106P 1951 Production of Sycamore helicopter for Army Bristol Sycamore HC.11[64]
 HR.106P –  HR.106P5 OR.304 1952–53 Air-sea rescue helicopters for RAF and RAAF Bristol Sycamore HR.12, HR.50, HR.13, HR.51, HR.14[65]
 N.107 NA.30 1951 Naval all-weather fighter de Havilland Sea Venom[66]
 F.108 OR.265/2 1951 Night fighter for RAF de Havilland Venom NF.2[67]
 UB.109 AST.1097 1951–1953 Expendable Bomber (i.e., guided missile) Bristol Type 182, Vickers Type 655, Boulton Paul P123[68]
 ER.110T 1951 Variable sweepback research monoplane Armstrong Whitworth AW.59, Blackburn B.90, Boulton Paul P.121, Bristol Type 183, Saro P.149[69]
 F.111P OR.265 1951 Interim jet-powered night fighter for RAF de Havilland Vampire NF.10[70]
 T.111P 1952 Two-seat trainer version of de Havilland Vampire de Havilland Vampire T.11[70]
 T.111P2 NA.36 1952 Two seat Vampire Trainer for RN de Havilland Sea Vampire T.22[70]
 R.112D OR.231/3 Reconnaissance flying boat Short PD.3[70]
 N.113D&P NA.17 1951–1953 Supermarine N.9/47 Development and Production Supermarine Type 544 Scimitar F.1[71]
 N.114T NA.14 1951 All-weather Naval Fighter Armstrong Whitworth AW.165, Blackburn B.89, Fairey N.114T, Saro P.148, Short PD.5, Westland N.114T[72]
 C.115P OR.266/2 1951 VIP version of Handley Page Hastings Handley Page Hastings C.4[73]
 T.116D OR.278 1951 Trainer version of de Havilland DH.110 for RAF [73]
 F118D, F118P c. 1953 All-weather fighter "Super Javelin" Gloster Javelin with new wing. Gloster GA.6/P.356[74]
 F.119D 1952 Hawker Hunter derivative with reheated Rolls-Royce Avon RA.14R and increased wingsweep Hawker P.1083[75]
 U.120D 1951 Remotely piloted target aircraft ML U.120[76]
 C.121P OR.300 1952 Communication aircraft for RAF Percival Pembroke C.1[76]
 ID.122D&P 1953 Intruder version of Canberra bomber English Electric Canberra B(I)8[77]
 PR.122P 1954 High-altitude reconnaissance version of Canberra English Electric Canberra PR.9[77]
 M.123 NA.32 1954 Light carrier-based anti submarine aircraft Short Seamew[78]
 F.124T OR.301 1952 Rocket fighter – superseded by F.137D and F.138D for Avro and Saro designs Avro 720, Blackburn B.97, Boulton Paul P.122, Bristol Type 178, Fairey F.124T, Hawker P.1089, Saro P.154, Short PD.7, Westland F.124T[79]
 EH.125 1952 Experimental rotor-blade tip-jet powered helicopter Percival P.74[80]
 B.126T OR.314 1952 Low-level bomber – cancelled 1954 Avro 721, Bristol 186, Handley Page H.P.99, Short PD.9.[81]
 H.127 NA.37 1952 Westland-Sikorsky WS-55[82]
 HCC.127 1958 Whirlwind helicopter for Queens Flight Westland Whirlwind HCC 8[82]
 B.128P OR.229/3 1952 Production of Victor B.1 bomber Handley Page Victor B.1[83]
 B.128P2 1958 Improved version of Victor bomber Handley Page Victor B.2[84]
 B.129P 1952 Production of Vulcan B.1 Avro Vulcan B.1[85]
 B.129P2 1958 Improved version of Avro Vulcan Avro Vulcan B.2[86]
 T.130D&P 1952 Conversion of unsold Handley Page Marathon airliners to navigation trainers for RAF Handley Page Marathon T.11[86]
 N.131T 1952 All weather fighter for Royal Navy – no further action de Havilland DH.116[87]
 C.132 OR.315 1952 Long-range jet transport Vickers V.1000[88]
 ER.133 Rocket-powered research aircraft – not issued Bristol Type 178[89]
 ER.134D 1954 High-speed research aircraft Bristol Type 188[90]
 F.137D OR.301/2 1953 Rocket powered interceptor – written around Avro 720 Avro 720[91]
 F.138D OR.301/2 1953 Mixed rocket-jet interception fighter – written around SR.53 Saunders-Roe SR.53[91]
 F.139 NA.38/3 1954 Two-seat naval all-weather fighter de Havilland Sea Vixen FAW.1[91]
 D.140P 1953 Pilotless target conversion of Fairey Firefly Fairey Firefly U.8[92]
  OR.323 1953 Transport aircraft – Hastings and Valetta replacement. Vickers 799 selected but requirement superseded by C.195/OR.344 (q.v.) written around Armstrong Whitworth AW.650 Argosy Armstrong Whitworth AW.55 and AW.56, Aviation Trader ATL-95, Blackburn B-104, Bristol Type 179, Vickers Type 799[93]
 RH.142D OR.334[94] 1953 VTOL transport aircraft Fairey Rotodyne; later cancelled[92]
 ER.143 1953 Experimental direct jet-lift VTOL research aircraft Short SC.1[95]
 HR.144 OR.31934408 1953 Ultra Light Helicopter Fairey ULH[95]
 HR.146D&P NA.43 1953 Development of Bristol 173 for the Royal Navy. Cancelled in favour of Westland Wessex. Bristol Type 191 for the Royal Navy[96]
 T147T OR.318 Advanced jet trainer – not progressed Avro Type 725[97]
 M.148 NA.39 1954 Low level naval strike aircraft Blackburn Buccaneer S.1, Armstrong Whitworth AW.168, Fairey M.148T, Hawker P.1108, Short PD.13, Westland M.148T[98]
 HR.149D&P ASR.326 1955 Anti-submarine development of the Bristol 173 for RAF (and later Royal Canadian Air Force). Bristol Type 191[99]
 H.150D&P OR.325 Twin-rotor transport helicopter for RAF Development of the Bristol 191 for the Royal Air Force Bristol Type 192 as the Westland Belvedere HC.1[100]
 C.151 Communications aircraft de Havilland Heron C.2 and C.3[101]
 F.153D 1955 All weather fighter (Javelin development) "Thin Wing Gloster All Weather Fighter". Updating of F.118. Gloster P.376[101][102]
 AEW.154 NA.64 1955 Carrier-based Airborne Early Warning aircraft Fairey Gannet AEW.3[103]
 F.155T OR.329 1955 High-altitude fighter – Fairey Delta III selected but project cancelled in 1957 Armstrong Whitworth AW.169, de Havilland DH.117, English Electric P.8, Fairey Delta III, Hawker P.1103, Saro P.187, Vickers Type 559[104]
 R.156T OR.330 1954 High-altitude supersonic reconnaissance aircraft Avro 730, English Electric P.10, Handley Page HP.100, Short PD.12, Vickers SP.4[105]
 RB.156T OR.330/2 1956 Reconnaissance-bomber – development of R.156T – cancelled 1957 Avro 730[106]
 T.157D&P 1955 Two-seat trainer version of Hawker Hunter for RAF Hawker Hunter T.7[107]
 N.157D&P 1957 Two-seat trainer version of Hawker Hunter for Royal Navy Hawker Hunter T.8[108]
 C.159P 1955 Purchase of single example of Bristol Freighter for A&AEE Bristol Freighter Mk. 31[109]
 ER.161 1955 Research aircraft for narrow delta wings Armstrong Whitworth AW.171 (VTOL with lift jets), Armstrong Whitworth AW.172 (no lift jets, thin wings)[110]
 F.162D 1955 Light jet fighter for RAF – development of Folland Midge Folland Gnat F.1[111]
 H.163 1955 Light helicopter for AOP duties for Army and training for RAF Saunders-Roe Skeeter AOP.10, T.11, AOP.12, T.13[112]
 ER.163 195? Experimental Fairey Delta 2 with de Havilland Gyron engine – later cancelled Fairey Delta 2
 FR.164D&P 1958 Fighter-reconnaissance version of Hawker Hunter Hawker Hunter FR.10[113]
 R.165D Specification for radios and radar for de Havilland Comet C.2. Not proceeded with. Possibly related to de Havilland Comet 2R ELINT aircraft[114]
 ER.166D 1955 Jet-propelled lift-fan VTOL research aircraft – not proceeded with Boulton Paul P.132[115]
 F.167D Hawker Hunter with AI.20 radar and de Havilland Firestreak air-to-air missiles. One aircraft (Hawker P.1109B) built Hawker Hunter[116]
 D.168D&P 1955 Conversion of Fairey Firefly AS.4 and AS.5 to pilotless target drone Fairey Firefly U.9[117]
 D.169D&P 1955 Conversion of Canberra B2 to pilotless target drone English Electric Canberra U.10, U.14[118]
 HAS.170D&P NA.43 1956 Anti-submarine helicopter for Royal Navy Westland Wessex HAS.1[119]
 D.171D&P 1955 Conversion of Avro Lincoln to pilotless target drone – Only two aircraft converted Avro Lincoln U.5[120]
 F.172D Lightweight supersonic fighter – variant of Folland Gnat with thin wing, afterburning engine and air-to-air missiles. Unbuilt Folland Gnat F.2[121]
 D.173D&P Conversion of Gloster Meteor F.4 to pilotless target drones by Flight Refuelling Ltd Gloster Meteor U.15[122]
 D.174D&P 1956 Conversion of Gloster Meteor F.8 to pilotless target drones by Flight Refuelling Ltd Gloster Meteor U.16[122]
 ER.175 Proposed conversion of de Havilland Canada DHC-3 Otter with jet flaps. Unbuilt [123]
 C.176 1956 Long range transport aircraft for RAF – military version of Bristol Britannia airliner Bristol Britannia C.1[124]
 F.177D OR.337 / NA.47 1956 Mixed power (rocket and turbojet) interceptor for RAF and Royal Navy Saunders-Roe SR.177[125]
 T.178D&P 1957 Dual control trainer version of English Electric Lightning English Electric Lightning T.4[126]
 TT.179D Target-tug conversion of Meteor night fighter for RAF.

Not proceeded with, but similar conversions made for RN as TT.20

 Gloster Meteor TT.20[127]
 ER.180D 1956 Sub-scale model of Avro 730 high-altitude reconnaissance-bomber to aid in development. Cancelled in 1957 with Avro 730 Avro 731[128]
 ER.181T Proposed high-speed (Mach 4–5) research aircraft. Not proceeded with.[128]
 T.182D Proposed conversion of English Electric Canberra B.2 to radar trainer. Unbuilt.[128]
 ER.183D Proposed conversion by Handley Page of Jet Provost trainer for boundary layer control research. Unbuilt Handley Page HP.103[128]
 ER.184D 1957 Conversion by Marshall's of Cambridge of Auster T.7 to boundary layer control research aircraft. One aircraft converted. Marshalls MA.4[129]
 T.185D 1958 Two seat trainer version of Folland Gnat for RAF. Folland Gnat T.1[130]
 C.186P 1957 Twin-engined STOL transport for RAF Scottish Aviation Twin Pioneer[131]
 D.187D&P Proposed conversion of Gloster Meteor NF.11 to pilotless target drone. Unbuilt.[132]
 ER.189D 1959 Purpose-built research aircraft for blown flaps. One example built. Hunting H.126[133]
 CC.190D Evaluation of Edgar Percival EP.9 for Army Air Corps. Two tested, but no further purchases. Edgar Percival EP.9[134]
 HAS.191D 1958 Fairey Ultra Light Weight helicopter (see HR.144D) for anti-submarine and communications use from small ships. Two evaluated. No production.[135]
RB.192D GOR.339 / OR.343 1957[note 5] STOL Tactical-Strike/Reconnaissance aircraft capable of Mach 2 and suitable for operation from unpaved strips – Canberra replacement. TSR.2 selected. Avro 738, Bristol Type 204, English Electric P.17A, Vickers Type 571, BAC TSR.2[138]
 ER.193D 1959 Conversion of Fairey Delta 2 with new Ogee delta wing. Specification developed into ER.221 (q.v.) BAC.221[139]
 HAS.194D 1959 Small shipboard anti-submarine helicopter Saunders-Roe P.531[140]
C.195 OR.344 1959 Replacement for Hastings and Valetta. Requirement replaced OR.323 (q.v.) and written around military derivative of Armstrong Whitworth AW.650 Argosy. Armstrong Whitworth AW.660 Argosy[141]
 X.197T 1959 Research glider with slender delta wing – abandoned in favour of powered ER.197D (q.v.). Avro 759, Bristol Type 215, Fairey X.197, Handley Page HP.115, Slingsby Sailplanes T.48, Supermarine Type 573,[142] Miles M.110[143]
 ER.197D 1959 Powered research aircraft for low speed handling of narrow delta wings. Handley Page HP.115[144]
 UB.198 1959 Nuclear armed air-to surface missile for V-bombers Avro Blue Steel[145]
 D.199D&P Proposed conversion of English Electric Canberra B2 to U.14 pilotless drones. Unbuilt.[146]
 UB.200D OR.1159 Long range nuclear armed guided bomb. Ramjet powered derivative of Blue Steel missile. Cancelled December 1959. Avro Blue Steel Phase 2[146]
 H.201 1960 Version of Saunders-Roe P.531 for Army Air Corps Westland Scout AH.1[147]
 D.202D&P 1959 Pilotless target drone GAF Jindivik[148]
 C.203 ASR.371 1959 Long-range strategic transport Avro Type 756, Hawker P.1131, Handley Page HP.111, Short Belfast, Vickers VC10 Military Freighter[149]
 ER.204D 1960 Experimental VTOL aircraft using Bristol Pegasus Hawker P.1127[150]
 T.205D&P 1960 Two seat trainer version of English Electric Lightning English Electric Lightning T.5[151]
 ER.206 OR.346 1959 Variable-sweep wing research aircraft, closely aligned with OR.346 for a strike aircraft for RAF and RN. Not developed. BAC/Type 588, Vickers ER.206, Vickers Type 583[152]
 CC.207D&6 OR.342 1960 Purchase of de Havilland Canada Beaver for Army Air Corps de Havilland Canada Beaver AL.1[153]
 D.208D&P 1960 Developed version of Jindivik target drone GAF Jindivik 102[154]
 D.209D&P 1960 Conversion of Gloster Meteor F.8 to pilotless target drones by Flight Refuelling Ltd. Similar to U.16 Gloster Meteor U.21[154]
 RH.210 1960 Enlarged, Rolls-Royce Tyne-powered, military transport version of Fairey Rotodyne gyroplane. Fairey Rotodyne Z[155]
 HAS.211T 1960 Initial tender for improved version of Westland Wessex for Royal Navy. Specification developed fully in HAS.227.D&P. Westland Wessex HAS.3[156]
 C.212D&P 1960 de Havilland Comet Mk.4 transport for RAF de Havilland Comet C.4[157]
 C.213D&P 1961 Vickers VC10 transport for RAF Vickers VC10 C.1[158]
 GAR.214D OR.345 1960 Tactical ground attack and reconnaissance aircraft. Specification issued to Hawker Siddeley. Abandoned by 1963[159]
 UT.215D&P 1962 Training round for Blue Steel without engine or warhead, to be carried by V-bombers for training flights. Unbuilt.[159]
 HAS.216 1961 Small shipboard anti-submarine helicopter. Production version of Saro P.531 Westland Wasp[160]
 ER.217 Ground effect research machine to be built by Folland Aircraft. Not progressed.[161]
 MR.218D OR.350 Maritime patrol aircraft for RAF. Avro Shackleton replacement. Superseded by MR.281/OR.357.[162]
 C.219D&P 1963 VIP transport aircraft – modified Hawker Siddeley HS.748 airliner Hawker Siddeley Andover[163]
  OR.303 195? Lightweight fighter to intercept Soviet Tupolev Tu-4 bombers Folland Midge
 FGA.236 GOR.345 195? V/STOL combat aircraft version of Hawker P.1127 – Harrier development Hawker Siddeley Kestrel FGA.1
OR.350 18 July 1960[164] Maritime patrol aircraft to enter service by 1968[165] Nimrod MR.1
  OR.351 1960 V/STOL freighter (to NATO Basic Military Requirement NMBR.4) English Electric P.36
  OR.356 19?? Supersonic V/STOL – Spec. SR.250 Hawker Siddeley P.1154; later cancelled
  OR.357 19?? Maritime reconnaissance aircraft – led to Nimrod Hawker Siddeley Nimrod
  OR.362 19?? Supersonic trainer aircraft – led to Jaguar SEPECAT Jaguar
  ASR.365 196? Helicopter – Tactical Support Westland Puma
  ASR.367 196? Bomber – Vulcan B.2 – see also B.35/46 Avro Vulcan B.2
  ASR.368 196? Bomber – Victor B.2 – see also B.35/46 Handley Page Victor B.2
  ASR.372 196? Trainer version of Lightning – Lightning T.5 English Electric Lightning T.5
  ASR.373 196? VIP Transport aircraft – Andover CC.2 Hawker Siddeley Andover CC.2
  ASR.376 196? Tanker aircraft Handley Page Victor B(K).1 / Handley Page Victor B(K).1A
 C.239 ASR.378 196? Transport aircraft – VC10 Vickers VC10
  ASR.381 196? Interim Maritime Patrol aircraft to Spec. MR.254 – written around Atlantique Breguet Atlantique
  ASR.382 196? Two-seat trainer version of P.1154 for RAF – cancelled Hawker Siddeley P.1154
  ASR.384 196? Harrier requirement – see also GOR.345 Hawker Siddeley Harrier
  ASR.385 196? Phantom for RAF McDonnell Douglas F-4M Phantom II
  ASR.397 1970 Basic jet trainer – BAC Jet Provost replacement BAE Systems Hawk T.1
  ASR.400 Airborne Early Warning Aircraft Hawker Siddeley Nimrod AEW.3
  ASR.409 Harrier replacement BAe/McDonnell Douglas AV-8B Harrier GR.5
 T.301 AST.412 Jet Provost replacement Short Tucano T.1
  GOR.2 1959 VTOL Strike Reconnaissance aircraft English Electric P.31, Gloster P.505
Spec Req. Year Type Related aircraft
 U.25/49 NA.03 Small Pilotless Target Aircraft
 N.12/45 NA.07 Single Seat, Long Range, Naval Fighter Aircraft Westland Wyvern TF.2
 N.114T NA.14 2-seat all-weather day/night fighter
 N.9/47 NA.17 16/09/47 Naval Fighter Aircraft Supermarine Type 508, 525 and 529 Scimitar prototypes
 S.14/48 NA.21 09/07/48 Naval Version of Sikorsky S.51 Helicopter Westland Dragonfly HR.1
 19/48P NA.27 Production of a Naval Fighter to E.1/45 Supermarine Attacker F.1
  NA.31 195? Skeeter for RN (A.13/49 Issue 2) Saunders-Roe Skeeter
 M.123 NA.32 195? Light carrier-borne Anti-submarine warfare aircraft to Spec. M.123 Short Seamew
  NA.34 May 1952 Hooked Swift for Carrier Trials
  NA.36 de Havilland Sea Vampire T.22
 M.148 NA.39 08/02/53 Carrier borne strike aircraft to Spec. M.148T Armstrong Whitworth AW.168, Blackburn Buccaneer, Short PD.13
  NA.43 Anti-Submarine and General Purpose helicopter
  NA.47 195? Mixed rocket-jet interception fighter for Royal Navy Saunders-Roe SR.177; cancelled 1957
  NSR.6451 19?? V/STOL carrier borne fighter aircraft – Naval Hawker Siddeley Harrier BAE Sea Harrier

General Staff Requirements For Aircraft

Spec GSR Year Type Related aircraft
  GSR.3335 196? Helicopter – Westland Scout replacement Westland Lynx
  GSR.3336 196? Helicopter – Bell 47G Sioux replacement Westland Gazelle

See also

References

Notes

  1. ↑ The specification included torpedo carrying and catapult-assisted launching.
  2. ↑ The requirement is often incorrectly stated to have required the use of Rolls-Royce Vulture engines. For example, by Thetford, Aircraft of the Royal Air Force since 1918, ("Avro Manchester") and Mason, The British Bomber ("Avro Manchester"). Buttler 2004, pp. 100–2 notes some of the submissions included other engines, and Sinnott, Aircraft Design, pp. 165–71.
  3. ↑ HP.66 would have had Hercules 100 engines, HP.69 turbo-supercharged Hercules.
  4. ↑ According to Buttler[53] no official sources acknowledge the B-78 as being tendered to the specification.
  5. ↑ GOR.339.[136] RB.192D was issued in 1960, after the TSR.2 had been selected.[137]

Citations

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Meekcoms & Morgan (1994).
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 London (2003), p. 283.
  3. ↑ Mason (1992), p. 446.
  4. 1 2 Mason (1992), p. 123.
  5. ↑ Mason (1992), p. 128.
  6. ↑ Mason (1992), p. 130.
  7. ↑ Mason (1992), p. 119.
  8. 1 2 3 Mason (1992), p. 150.
  9. ↑ Mason (1994), p. 106.
  10. ↑ Mason (1994), pp. 95, 98.
  11. 1 2 Mason (1992), p. 113.
  12. ↑ Mason (1992), p. 116.
  13. ↑ Mason (1992), p. 127.
  14. ↑ Andrews & Morgan (1987), p. 27.
  15. 1 2 Mason (1992), p. 124.
  16. ↑ Mason (1992), p. 117.
  17. 1 2 Mason (1994), p. 112.
  18. ↑ Mason (1994), p. 113.
  19. 1 2 Mason (1992), p. 100.
  20. ↑ Taylor (1974), p. 67.
  21. ↑ Taylor (1974), p. 71.
  22. 1 2 Mason (1994), p. 89.
  23. ↑ Mason (1994), p. 99.
  24. ↑ London (2003), pp. 39–40.
  25. ↑ Mason (1992), p. 149.
  26. ↑ Mason (1992), p. 147.
  27. ↑ Mason (1992), p. 145.
  28. ↑ Barnes & James 1989, p. 159.
  29. ↑ London (2003), pp. 84–85.
  30. ↑ London (2003), p. 75.
  31. ↑ Andrews & Morgan (1987), p. 87.
  32. ↑ Andrews & Morgan (1987), p. 90.
  33. ↑ Andrews & Morgan (1988), pp. 127–129.
  34. ↑ Andrews and Morgan (1988) p236
  35. ↑ Gustin, Emmanuel. "No allowance sighting". Flying Guns. Archived from the original on 18 October 2006. Retrieved 1 February 2007.
  36. ↑ Andrews and Morgan (1988) p242
  37. 1 2 3 4 5 6 7 8 9 10 11 12 Aeromilitaria (1996), p. 88.
  38. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 Meekcoms & Morgan (1994), pp. 187–202.
  39. 1 2 3 4 5 6 7 8 Aeromilitaria (1996), p. 89.
  40. ↑ Buttler 2004, p. 94.
  41. ↑ Meekcoms & Morgan 1994, p. 217.
  42. ↑ Delve, Ken (2005). Bomber Command. Havertown: Pen and Sword. ISBN 978-1-78383-327-6.
  43. 1 2 3 Buttler (2004), pp. 74–75.
  44. ↑ Buttler (2004), pp. 109–111.
  45. ↑ Jackson (1974).
  46. 1 2 Buttler (2004).
  47. ↑ Buttler (2004), pp. 87–88.
  48. ↑ Buttler (2004), p. 87.
  49. 1 2 Buttler (2004), p. 62.
  50. ↑ Buttler (2004), p. 228.
  51. ↑ Buttler (2004), p. 129–130.
  52. ↑ London (2003), p. 285.
  53. 1 2 Buttler (2004), p. 144.
  54. ↑ Buttler 2017, p. 55.
  55. ↑ Buttler (2017), p. 61.
  56. ↑ Butler (2011a), pp. 23–24.
  57. ↑ Butler (2011a), p. 24.
  58. 1 2 Butler (2011b), p. 59.
  59. 1 2 Butler (2011b), p. 61.
  60. 1 2 Butler (2011c), p. 99.
  61. ↑ Butler (2011c), pp. 99–100.
  62. 1 2 Butler (2011c), p. 100.
  63. ↑ Butler (2011c), pp. 100–101.
  64. 1 2 Butler (2011c), p. 101.
  65. ↑ Butler (2011d), pp. 175–176.
  66. ↑ Butler (2011d), pp. 176–177.
  67. ↑ Butler (2011d), p. 177.
  68. ↑ Butler (2011d), pp. 177–178.
  69. ↑ Butler (2012a), pp. 24–25.
  70. 1 2 3 4 Butler (2012a), p. 26.
  71. ↑ Butler (2012a), p. 27.
  72. ↑ Butler (2012b), pp. 71–73.
  73. 1 2 Butler (2012b), p. 73.
  74. ↑ Buttler (2017), p. 93.
  75. ↑ Butler (2012b), p. 76.
  76. 1 2 Butler (2012b), p. 77.
  77. 1 2 Butler (2012c), p. 111.
  78. ↑ Butler (2012c), p. 112.
  79. ↑ Butler (2012c), pp. 113–115.
  80. ↑ Butler (2012c), p. 115.
  81. ↑ Butler (2012d), pp. 160–162.
  82. 1 2 Butler (2012d), p. 163.
  83. ↑ Butler (2012d), pp. 163–164.
  84. ↑ Butler (2012d), p. 164.
  85. ↑ Butler (2012d), pp. 164–165.
  86. 1 2 Butler (2012d), p. 165.
  87. ↑ Butler (2013a), pp. 26–27.
  88. ↑ Butler (2013a), pp. 27–29.
  89. ↑ Butler (2013a), p. 29.
  90. ↑ Butler (2013a), pp. 29–32.
  91. 1 2 3 Butler (2013b), p. 69.
  92. 1 2 Butler (2013b), p. 72.
  93. ↑ Gibson (2016d), p. 187.
  94. ↑ Aeromilitaria (1996), p. 102.
  95. 1 2 Butler (2013c), p. 135.
  96. ↑ Butler (2013d), p. 183.
  97. ↑ Butler (2014a), p. 32.
  98. ↑ Butler (2014a), pp. 32–37.
  99. ↑ Gibson (2014b), p. 74.
  100. ↑ Gibson (2014b), pp. 74–75.
  101. 1 2 Gibson (2014b), p. 75.
  102. ↑ Buttler (2017), pp. 94, 99–100.
  103. ↑ Gibson (2014c), pp. 107–108.
  104. ↑ Gibson (2014c), pp. 108–110.
  105. ↑ Gibson (2014d), pp. 182–183.
  106. ↑ Gibson (2014d), pp. 183–184.
  107. ↑ Gibson (2015a), p. 34.
  108. ↑ Gibson (2015a), pp. 34–35.
  109. ↑ Gibson (2015a), p. 35.
  110. ↑ Gibson (2015a), pp. 35–37.
  111. ↑ Gibson (2015b), pp. 81–82.
  112. ↑ Gibson (2015b), pp. 82–83.
  113. ↑ Gibson (2015b), pp. 83–84.
  114. ↑ Gibson (2015b), p. 84.
  115. ↑ Gibson (2015c), pp. 127–128.
  116. ↑ Gibson (2015c), pp. 128–131.
  117. ↑ Gibson (2015c), pp. 131–132.
  118. ↑ Gibson (2015c), pp. 132–133.
  119. ↑ Gibson (2015d), p. 159.
  120. ↑ Gibson (2015d), pp. 159–160.
  121. ↑ Gibson (2015d), pp. 160–161.
  122. 1 2 Gibson (2015d), p. 161.
  123. ↑ Gibson (2015d), p. 162.
  124. ↑ Gibson (2016a), pp. 25–26.
  125. ↑ Gibson (2016a), pp. 27–28.
  126. ↑ Gibson (2016a), pp. 28–29.
  127. ↑ Gibson (2016a), p. 29.
  128. 1 2 3 4 Gibson (2016b), p. 91.
  129. ↑ Gibson (2016b), pp. 91–92.
  130. ↑ Gibson (2016b), pp. 92–93.
  131. ↑ Gibson (2016c), pp. 110–111.
  132. ↑ Gibson (2016c), p. 111.
  133. ↑ Gibson (2016c), pp. 111–112.
  134. ↑ Gibson (2016c), p. 112.
  135. ↑ Gibson (2016d), pp. 183–184.
  136. ↑ Gibson (2016d), p. 185.
  137. ↑ Gibson (2016d), p. 184.
  138. ↑ Gibson (2016d), pp. 184–185.
  139. ↑ Gibson (2016d), pp. 185–186.
  140. ↑ Gibson (2016d), pp. 186–187.
  141. ↑ Gibson (2016d), pp. 187–188.
  142. ↑ Gibson (2017a), pp. 15–17.
  143. ↑ "Feedback" Aeromilitaria Summer 2017, pp. 59–60.
  144. ↑ Gibson (2017a), p. 17.
  145. ↑ Gibson (2017a), pp. 17–19.
  146. 1 2 Gibson (2017a), p. 19.
  147. ↑ Gibson (2017b), pp. 85–86.
  148. ↑ Gibson (2017b), p. 86.
  149. ↑ Gibson (2017b), pp. 87–89.
  150. ↑ Gibson (2017b), pp. 89–91.
  151. ↑ Gibson (2017b), p. 91.
  152. ↑ Gibson (2017c), pp. 111–113.
  153. ↑ Gibson (2017c), pp. 113–114.
  154. 1 2 Gibson (2017c), p. 114.
  155. ↑ Gibson (2017c), pp. 114–115.
  156. ↑ Gibson (2017c), pp. 115–116.
  157. ↑ Gibson (2017c), pp. 116–117.
  158. ↑ Gibson (2017c), pp. 117–118.
  159. 1 2 Gibson (2017c), p. 118.
  160. ↑ Gibson (2017d), pp. 157–158.
  161. ↑ Gibson (2017d), p. 158.
  162. ↑ Gibson (2017d), pp. 158–160.
  163. ↑ Gibson (2017d), p. 160.
  164. ↑ "Air Staff Target OR.350". 18 July 1960. {{cite web}}: Missing or empty |url= (help)
  165. ↑ Gibson, Chris (2015). Nimrod's Genesis. Ottringham: Hikoki Publications. pp. 116–117. ISBN 978-190210947-3.

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  • Barnes, C. H.; James, D. N (1989). Shorts Aircraft since 1900. London: Putnam. ISBN 0-85177-819-4.
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Further reading

  • Munson, Kenneth (1970). Bombers Between the Wars 1919–39 – Including Patrol and Transport Aircraft (Blandford Colour Series). London: Associate R.Ae.S. ISBN 0-7137-0514-0.
  • Munson, Kenneth (1972). Bombers In Service – Patrol and Transport Aircraft Since 1960 (Blandford Colour Series). London: Associate R.Ae.S. ISBN 0-7137-0586-8.
  • Munson, Kenneth (1975). Fighters 1939–45 – Attack and Training Aircraft (Blandford Colour Series). London: Associate R.Ae.S. ISBN 0-7137-0378-4.
  • Munson, Kenneth (1977). The Pocket Encyclopaedia of Bombers at War (Blandford Colour Series, New Orchard ed.). London: Associate R.Ae.S. ISBN 1-85079-028-0.: This is a combined volume made up of
    • Munson, Kenneth (1975). Bombers Patrol and Transport Aircraft 1939–1945 (Blandford Colour Series). London: Associate R.Ae.S.
    • Munson, Kenneth (1977). Bombers Patrol and Reconnaissance Aircraft 1914–1919 (Blandford Colour Series). London: Associate R.Ae.S.
  • Sinnott, Colin (2001). The RAF and Aircraft Design 1923–1939: Air Staff Operational Requirements. London: Frank Cass. ISBN 0-7146-5158-3.
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