Conrad C.III
C III NAG
Type Inline engine
National origin Germany
Manufacturer Nationale Automobil Gesellschaft
First run ca. 1916
Major applications DFW C.Vc, Rumpler C.Ic

The Conrad C.III was a six-cylinder, water-cooled inline aircraft engine designed by Robert Conrad. It was used on some German training aircraft during World War I. The engine was mainly produced under license by the German Nationale Automobil Gesellschaft.

Development

After having designed two aircraft engines for the German Kaiserpreis aircraft engine competition of 1912/13, Robert Conrad prepared an 180 hp (134 kW) six-cylinder aircraft engine for the second Kaiserpreis competition anticipated to take place in 1914–1915. Further improvements on the engine design were done in 1915 by Robert Conrad while he was working for the Deutsche Motorenbau-Gesellschaft. His work resulted in a six-cylinder water-cooled engine with increased bore which was capable of delivering 185 hp (138 kW) at 1400 rpm. After a successful type test in February 1916 the engine was assigned the designation C.III (C for Conrad) by the German military.[1]

Due to insufficient production capacity at the Deutsche Motorenbau-Gesellschaft, the engine was produced by the Nationale Automobil-Gesellschaft (NAG).[1]

After NAG subsequently adapted the engine, it was uprated to 210 hp (157 kW) and successfully type tested in November 1916.[1] The new 210 hp variant however turned out to be unreliable and so subsequent versions of the engine were again rated 185 hp (138 kW), although with various design improvements over the original C.III.

Variants

NAG C.III (C.III Nag b) aircraft engine on display at the Polish Aviation Museum in Kraków

Engine production was undertaken by NAG under license. Despite various adaptions of the original design all variants had the same bore and stroke.

C.III
initial design by Deutsche Motorenbau-Gesellschaft (Conrad), license produced by NAG as C.III Nag.[2]
C.III Nag
initial production variant of the C.III engine, license production by NAG, 185 hp (138 kW), wet-sump lubrication system.[3]
C.III Nag a
improved production variant, 185 hp (138 kW), improvements over the preceding C.III Nag include revised T-shaped intake manifolds and a dry-sump lubrication system with revised oil sump and oil pump.[4]
C.III Nag b
improved production variant, 185 hp (138 kW), improvements over the preceding C.III Nag a include an oil pump fed valvetrain lubrication system, a revised air pump for pressurizing the fuel system and a revised central placement of the two carburettors, along with provisions for mounting a wireless generator on the admission side of the engine.[5]
C.IIIa
adapted and uprated variant of the initial C.III design, 210 hp (157 kW),[2] only small number of engines produced, turned out to be unreliable.[1]
C.IIIb Nag
185 hp (138 kW), no further details given.[2]
C.IIIav Nag
185 hp (138 kW), new design, no further details given.[2]

Applications

The Conrad C.III (Nag) engine was primarily allocated for training machines because it was found to be too heavy for use in fighter aircraft.[6]

Preserved engines

Specifications (C.III NAG)

Data from [3]

General characteristics

  • Type: 6-cylinder, inline, water-cooled, piston engine
  • Bore: 138 mm (5.433 in)
  • Stroke: 190 mm (7.480 in)
  • Displacement: 17.051 L (1,041 cu in)
  • Dry weight: 332 kg (732 lb)

Components

  • Valvetrain: One overhead camshaft, driving two inlet and two exhaust valves per cylinder.
  • Fuel system: Two Pallas carburetters, each serving three adjacent cylinders. Two spark plugs per cylinder, placed horizontally and opposite each other, supplied by two Bosch ZH 6 magnetos.
  • Cooling system: Water-cooled

Performance

See also

References

Wikimedia Commons has media related to N.A.G. C.III.
  1. 1 2 3 4 Kyrill von Gersdorff, Kurt Grasmann. Flugmotoren und Strahltriebwerke, Bernard & Graefe Verlag, 1981, ISBN 3-7637-5272-2
  2. 1 2 3 4 Jack Herris. Development of German Warplanes in WWI, Aeronaut Books, 2012, ISBN 978-1-935881-08-7
  3. 1 2 Der NAG-Flugmotor 185 PS - C III NAG, Aircraft engine manual, 1917.
  4. ↑ 185 PS NAG Flugmotor Typ C III Nag a, Aircraft engine manual, 1918.
  5. ↑ 185 PS NAG Flugmotor Typ C III Nag b, Aircraft engine manual, 1918.
  6. 1 2 P M Grosz. Windsock Datafile No.79, RUMPLER C.I, Albatros Productions, Ltd., 2000, ISBN 1-902207-21-1
  7. ↑ P M Grosz. Windsock Datafile No.53, DFW C.V, Albatros Productions, Ltd., 1995, ISBN 0-948414-70-7
  8. ↑ Peter M Grosz. Gotha!, Albatros Productions Ltd., 1994, ISBN 0-948414-57-X
  9. ↑ Gray, Peter; Thetford, Owen (1970). German Aircraft of the First World War (2nd ed.). London: Putnam. p. 480. ISBN 0-370-00103-6.
  10. 1 2 Heinrich Dechamps, Karl Kutzbach. Prüfung, Wertung und Weiterentwicklung von Flugmotoren, 1921.
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