Early in World
War I, the British Admiralty asked Rolls-Royce to develop a 200 hp
aircraft engine. Like many engines of the time, Rolls-Royce's design was
strongly influenced by Mercedes. The prototype Eagle was first run in 1915
and was soon producing 225 hp.
The Eagle was subjected to constant improvement; the Eagle VIII was
producing 350 hp by 1917. In the immediate post-war period, this engine
was the leading British engine for large aircraft. The Eagle powered the
first direct transatlantic flight as well as the first flight from England
to Australia – both in the Vickers Vimy aircraft.
- Eagle VIII: 375 hp (280 kW)
- V-12 piston engine
- Liquid cooled
- Displacement 1,238 cubic inches (20 liters)
- Bore x stroke: 4.5 x 6.5 inches