Energy diagram for a 40-50 model with a compression ratio of 3.9, showing various efficiencies and losses against engine RPM.
| Identifier | ExFiles\Box 72\4\ scan0331 | |
| Date | 14th November 1923 guessed | |
| ENERGY DIAGM OF THE 40-50 R.R. COMP. RATIO 3.9. SEE SHEET 2. % OF THE INITIAL PETROL ENERGY. R. {Sir Henry Royce} P. M. {Mr Moon / Mr Moore} LOSSES THRO' - COOLING WATER. EXH. GASES RADIATION CHARGING WK INDICATED TH. EFFCY PISTON POWER MOTOR FRICTION. TH. EFFICIENCY. | ||
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).