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).
Data table showing heat distribution as a percentage of heat supplied at various engine RPMs.
| Identifier | ExFiles\Box 24\4\ Scan094 | |
| Date | 6th September 1923 guessed | |
| SHEET 2, contd :- HEAT DISTRIBUTION AS PERCENTAGE OF HEAT SUPPLIED. R.P.M. | 500 | 750 | 1000 | 1250 | 1500 | 1750 | 2000 Thermal equt. work done. | 18.2 | 18.26 | 20.15 | 20.0 | 20.18 | 20.13 | 18.8 Loss to engine friction. | 3.14 | 2.98 | 3.54 | 4.0 | 4.56 | 5.37 | 6.33 Ht. loss to jackets. | 30.82 | 28.77 | 31.02 | 26.3 | 24.44 | 24.0 | 22.85 Loss through exh. radiation by difference. | 47.84 | 49.99 | 45.3 | 49.7 | 50.8 | 50.49 | 52.1 Heat supplied. | 100 | 100 | 100 | 100 | 100 | 100 | 100 | ||