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).
Graph of specific fuel consumption versus engine speed.
| Identifier | ExFiles\Box 179b\3\ img176 | |
| Date | 7th February 1933 guessed | |
| SPECIFIC CONSUMPTION (LBS/BHP) .34 .36 .38 .40 .42 ENGINE SPEED (R.P.M) 1400 1500 1600 1700 1800 SPEC. FUEL CONSUMPTION NORMAL SPEED | ||