Aircraft engine: Rolls-Royce Eagle Mk IX
|Displacement||20.3 l (1,238.8 cu in)|
|Propeller reduction gear ratio||0.6|
|Weight||438 kg (965.6 lb)|
|Maximum power||390 hp at 2,000 RPM|
|Climb power||360 hp at 1,800 RPM|
The first Rolls-Royce aircraft engine to be mass-produced.
Studies on aircraft engines at the Rolls–Royce company began in 1914, following the British Admiralty’s order for 200 hp aircraft engine. The first type to enter series production in 1915 was the Eagle I – a 12 cylinder water cooled engine, fitted with two Claudel carburettors and reduction gear, allowing the propeller to spin at 1,024 RPM. Continuous upgrades of the basic design allowed to put subsequent more powerful and reliable versions to production (Eagle II, III, IV, V, VI, VII, VIII). The last military version was the Eagle VIII, rated at 360 hp at 1,800 RPM, fitted with four carburettors, one per three cylinders.
After the war studies on a high power engine for civil aviation began, which resulted in the Eagle IX engine, fitted with two Claudel–Hobson carburettors and four magnetos. The emphasis was put on the work safety: to decrease possibility of the fire danger, the carburettors were placed on the both sides of an oil sump, beyond the engine's hot parts. Four magnetos assured the engine stabile work. The production at the Derby plant lasted from 1922 to 1928 and totalled 373 engines. They powered e.g. the Handley-Page 0/400 and Dornier Do J II Wal aircraft.