From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance results of the boosted Eagle engine and mentioning future developments with the Fancom X engine.
| Identifier | ExFiles\Box 43\1\ Scan111 | |
| Date | 1st September 1925 | |
| To CJ. } FROM R.{Sir Henry Royce} RG.{Mr Rowledge} } c. to RG{Mr Rowledge} BJ. Wor.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} +3989 R9/M1.9.25. RE. BOOSTED EAGLE. <s>X.4114 X.3989</s> X.3804 Hs.{Lord Ernest Hives - Chair} has sent me the results of tests in conjunction with the boosted output of the Eagle engine, and where it has been able to do 450 HP. at 2400 r.p.m. with a fuel of 25% aromatics. It will be seen therefore that this engine would easily have done the H.P. I proposed, and we think there is no doubt we could have got within the weight specified, and we believe under those conditions it would have been equal in reliability to the Curtiss, but at the same time we are expecting still better results from the new Fancom X, which will be better for head resistance, supercharger, and many other features. The new model of this engine should have every attention, as it should be of great value to us, and to the country. R.{Sir Henry Royce} | ||