johnbr
2nd Lieutenant
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Rolls-Royce Eagle
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johnbr
2nd Lieutenant
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johnbr
2nd Lieutenant
he 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
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
- 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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johnbr
2nd Lieutenant
Rolls-Royce Eagle info
wuzak
Captain
Rolls-Royce proposed a double Merlin based on the 60 series.
It was basically two engines combined on one crankcase, like the infamous Fairey P.24.
The double Merlin had two superchargers - two speed and two stage each.
The weight of this engine would have been less than the Eagle, and the power more, though its width and height were probably more, but length less.
Could have been interesting if the double Merlin was to have the cranks geared together using a single supercharger - it would have been lighter and more compact.
It was basically two engines combined on one crankcase, like the infamous Fairey P.24.
The double Merlin had two superchargers - two speed and two stage each.
The weight of this engine would have been less than the Eagle, and the power more, though its width and height were probably more, but length less.
Could have been interesting if the double Merlin was to have the cranks geared together using a single supercharger - it would have been lighter and more compact.
AMCKen
Senior Airman
Just about double the weight of a Sabre for about the same power.
Good shots!
wuzak
Captain
I have seen much of this information before and it is always interesting to refressh my memory of it. However, there is one piece of technical development of the 'Eagle' H.24 that is not 'on record' (at least, so far as I know) is that Rolls-Royce were investigating a 2-speed propeller reduction-gear drive (i.e. changing airscrew speed as one would in a car transmission). This is confirmed by its mention in a Hawker proposed fighter brochure. Does anyone have any further information on this development, especially diagrams, experimental data, etc?
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johnbr
2nd Lieutenant
the Eagle 22 was relatively heavier is because they were conservative at the beginning but also to get the relative speeds down to improve reliability..
There is a parameter known as Mean Piston Speed that turns out to have a good correlation with engine reliability. Measured in ft/sec values of 2600 for cruise and 2900 for take off seem to be the boundaries between a reasonable engine life and one that begins to reduce reliability.
There is a parameter known as Mean Piston Speed that turns out to have a good correlation with engine reliability. Measured in ft/sec values of 2600 for cruise and 2900 for take off seem to be the boundaries between a reasonable engine life and one that begins to reduce reliability.
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