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for the 1940s engine, see Rolls-Royce Eagle 22

The Rolls-Royce Eagle V12 was an aero engine developed during the First World War by Rolls-Royce that was used to power a number of military aircraft.

The design was a liquid cooled V12 engine with the cylinders inclined at 60 degrees and the valves driven by overhead camshafts. It first ran in 1915. Bore and stroke were 5.5 inches by 6.5 inches (140 x 165 mm) giving a 20 litre capacity. The whole engine weighed 408 kg (900 lb) producing 360 hp (268 kW) at 1800 rpm.

Production ran until 1928 by which point 4,681 had been built.

There is an example of this engine in the Science Museum, London.

[edit] Specifications (Eagle)

General characteristics

• Type: 12-cylinder liquid-cooled 60° Vee aircraft piston engine
• Bore: 5.5 in (140 mm)
• Stroke: 6.5 in (165 mm)
• Displacement: 1,220 in³ (20 L)
• Dry weight: 900 lb (408 kg)

<h3>Components

• Valvetrain: Overhead camshafts
• Supercharger: none
• Cooling system: Liquid-cooled

<h3>Performance

• Power output: 360 hp (268 kW) at 1,800 rpm
• Specific power: 0.32 hp/in³ (13.4 kW/L)
• Power-to-weight ratio: 0.40 hp/lb (0.66 kW/kg)

[edit] References

• Science Museum, London
• Rolls-Royce

[edit] See also

• Rolls-Royce Hawk - half an Eagle
• Rolls-Royce Condor - an upscaled Eagle

it:Rolls Royce Eagle