Design and layout

The vessel had a registered tonnage of 2,756; a depth of 17 feet (5.2 m); a length of 347 feet (106 m) (336 feet (102 m) between the perpendiculars); beam of 48 feet (15 m) and a speed of 22 knots. She was certified for 2,486 passengers and a crew of 83.

There were 5 decks: the Boat Deck, Promenade Deck, Shelter Deck, Main Deck and Lower Deck. The Boat Deck was 174 feet (53 m) long and the Promenade Deck 298 feet (91 m).^[3] The Promenade Deck on the Mona's Queen extended forward towards the bow giving the impression it was larger than even the Lady of Mann. The Shelter, Main and Lower decks extended the full length of the ship. She was considered to be an elegant ship because of her straight lines and elliptical stern.

Part of the space on the starboard side amidships on the main deck was occupied by provision rooms which included a refrigerated store, the ship was fitted with a Hallmark automatic refrigerator.^[3]

Power

Mona's Queen was propelled by twin screws driven through single reduction gearing by two sets of Parsons steam turbines. She was the first of the Company's ships to have water tube boilers, taking up less room than the scotch boilers previously used. Each set of turbines comprised a high pressure and a low pressure turbine. The high pressure turbines were of an impulse reduction type, two rows of impulse blading being followed by end tightened reaction blading, while the low pressure turbine ahead blading was of the all reaction type.^[3] The astern turbines were incorporated in the after ends of both high pressure and low pressure turbine casings and were capable of developing up to 70% of the full ahead power. The turbines were fitted with governors for overspeed control.^[3]

The turbines exhausted into a large condenser capable of maintaining a vacuum of 29 inches at full power and fitted with turbines of Alumbro composition made by Imperial Chemical Industries.^[3] The condensers were placed outboard of the turbines and their exhaust openings were connected directly to the lower portions of the low pressure turbine casings. This arrangement eliminated the requirement for large overhead trunking and greatly simplified the work of overhauling the low pressure turbines. In order to ensure a suitable feed of water, a water softening plant supplied by Paterson Engineering was fitted, and an electric salinometer was installed to test the salinity of the condensate from both port and starboard condensers and also of the reserve feed water.^[3]

Steam was supplied at 230 lbf/in by three water tube boilers. The boilers were oil fired and operated under the closed stokehold system of forced draught.^[3] The air for combustion was supplied by two large fans driven by enclosed forced-lubrication engines, manufactured by Matthew Paul & Co. The oil firing equipment was supplied by Babcock & Wilcox, a special feature being the electrically driven lighting up set. The fuel oil was carried in two deep tanks arranged on either side of the after boiler with the oil settling tanks placed behind the boiler at the centre of the ship. Two large pumps were provided for oil transfer purposes and an additional pump was provided for emergency bilge duties. A CO₂ recorder was fitted in the boiler room to assist combustion control. For fire fighting purposes a Foamite Firefoam system was installed.^[3]

The air pumps were of the Weir Paragon type and circulating water was supplied by centrifugal pumps driven by compound enclosed forced lubrication engines.^[3] The air pumps discharged through a gravitation type filter to a large feed tank. A turbo pump would draw from the feeder tank and discharge through the feed heater to the boilers, with a further direct acting pump being provided as standby. The feed heater would provide an automatic drain control. Lubrication was provided by three pumps and the oil cooler was fitted with tubes of cupronikel.^[3]

Technology

Sleeping accommodation

A special feature of the First Class Lounge was an arrangement whereby the sofas at the sides of the vessel could be quickly transformed into 12 private cabins and so provide sleeping accommodation for 48 passengers. The three saloons on the Lower Deck, together with the two aft for the Third Class passengers were also fitted with sofas which could provide sleeping accommodation. Berth curtains were provided for privacy when the spaces were being used.

Lifeboats

The ship was issued with a Board of Trade Lifesaving Appliance and Safety Certificate, the appliances including 10 Class 1A lifeboats carried in Columbus davits, and teak buoyant seats and rafts for over 2,440 persons – sufficient for all passengers and crew on board.^[3] Electric winches were installed for handling the lifeboats.^[3]

Domestic

Mona's Queen was the lead ship of the last three vessels – all twin-screw and geared turbines – to be built for the Steam Packet Company before the Second World War. She was painted with a white hull over green like the Lady of Mann and Ben-my-Chree. This was a summer colour scheme adopted by the company in the 1930s.

During the busy summer season, the Mona's Queen was employed on the main route between Douglas and Liverpool. It also inaugurated evening cruises from Douglas to the Calf of Man.

In the 1935 film No Limit, the Mona's Queen can be seen berthed alongside the Prince's Landing Stage in Liverpool just before it is boarded by the film's star, George Formby.

Fenella and Tynwald followed the Mona's Queen into service in 1937 (however, all three ships would be lost during the war).

Mail and cargo

Mona's Queen's designation as a Royal Mail Ship (RMS) indicated that she carried mail under contract with the Royal Mail. A specified area was allocated for the storage of letters, parcels and specie (bullion, coins and other valuables). In addition, there was a considerable quantity of regular cargo, ranging from furniture to foodstuffs.

Troop ship

Mona's Queen was requisitioned as a troop ship by the British government on 3 September 1939, the day war was declared. Although she served a military purpose, the ship remained a merchantman with a Steam Packet captain and crew. Most of May 1940 was spent evacuating refugees from Dutch and French ports as the massive German advance swept forward to the Channel. On 22 May she carried 2,000 British troops from Boulogne to Dover.

Dunkirk

Mona's Queen pictured shortly after she struck a mine on the approach to Dunkirk, 29 May 1940.

Mona's Queen was one of the first vessels to make a successful round trip during the Dunkirk evacuation. Under the command of Captain Radcliffe Duggan, she arrived back in Dover during the night of 27 May with 1,200 troops. The next day the ship returned to sea and was shelled off the French coast by shore guns but escaped damage.

Captain Duggan was temporarily replaced by Capt. Holkham^[6] following which in the early hours of 29 May, the Mona's Queen set sail for Dunkirk from Dover loaded with water canisters because troops on the Dunkirk beaches were short of drinking water. However, the ship struck a magnetic sea mine outside Dunkirk harbour at 5:30am. The Mona's Queen sank in two minutes.^[7]

Captain Archibald Holkham, who had taken over as Master, and 31 members of the crew were picked up by destroyers. Twenty-four of the crew were lost. Of the crew who died, 14 worked in the engine room. They included the Chief and Second Engineer. Seventeen of the dead were from the Isle of Man.^[6] The wreck is designated as a war grave.