Grace's Guide

British Industrial History

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Rolls-Royce Engines: Eagle 22

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1947. 3500 HP H-24 aero engine.

Note: This is a sub-section of Rolls-Royce

The Rolls-Royce Eagle 22 was a 24-cylinder sleeve-valve aero engine of 46 Litres (2,807 cubic inches) displacement. Produced in the late 1940s it was liquid cooled, of flat H configuration with two crankshafts and capable of 3,200 hp (2,387 kW) at 18 psi boost.

The Eagle was extremely powerful, but was never fitted to a production front-line fighter, as it was overshadowed by a new wave of jet engines, such as the Rolls-Royce Derwent and Nene. Approximately 50 Eagles were produced. It was used in the prototypes of the Westland Wyvern fighter/torpedo bomber.

General characteristics

  • Type: 24-cylinder liquid-cooled H-type aircraft piston engine
  • Bore: 5.394" 137mm
  • Stroke: 5.118" 130mm
  • Displacement: 2,806.6 in³ (45.99 L)
  • Dry weight: 3900 lbs


  • Valve-train: sleeve valves
  • Cooling system: Liquid-cooled


  • Power output: 3,200 hp (2,387 kW) at 18 psi (124.1 kPa) of boost (bmep 258psi if 3500rpm)
  • Specific power: 1.13 hp/in³ (51.7 kW/L)
  • Power-to-weight ratio: 0.82hp/lb

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