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).
The performance and petrol consumption of the 'Falcon' engine at different RPMs.
| Identifier | ExFiles\Box 36\2\ scan 057 | |
| Date | 6th May 1919 | |
| To EB/T. from EH. RE "FALCON" ENGINE X.3252 X.2934.✓ The "Falcon" engine will develop 190 to 200 HP. when using 14 gallons of petrol per hour on ground level. This means, if a Falcon engine is run full power at 1400 revs. oer minute it will approximately use 14 gallons of petrol per hour and develop 200 HP. If a propeller is fitted which allows the engine to rev up to 1800 R.P.M. on the ground, the engine must be throttled down to about 1500 R.P.M. to consume 14 G.P.H. I think you might explain to the "Westland" people that the reason we ask that the petrol consumption on long continuous flights should not exceed 14 G.P.H. is because it is the most convenient method of seeing at a glance what HP. is being given out by the engine. EH. | ||