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 graph for a 20-HP engine showing heat flow, horsepower, and fuel consumption against RPM.
| Identifier | ExFiles\Box 74\4\ scan0190 | |
| Date | 29th September 1924 | |
| 20-HP HT. FLOW TO JACKET WATER 29-9-24 HT FLOW AS % OF INITIAL FUEL ENERGY 40 30 20 %AGE HT. FLOW TO WATER HP. AT ROAD WHEELS PET. CONSUMPTION HT FLOW TO JACKETS B.T.U.s p MIN. 3000 2000 1000 00 R.P.M. 500 1000 1500 2000 2500 H.P. PTS/HOUR 40 40 30 30 20 20 10 10 0 0 | ||