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 tables showing heat distribution expressed as a percentage of heat supplied at different RPMs for two engine models.
| Identifier | WestWitteringFiles\K\November1923\ Scan43 | |
| Date | 12th July 1923 guessed | |
| PAGE 2. HEAT DISTRIBUTION CONTD:- E.A.C-1. Expressed as % of Heat Supplied. R.P.M. | Heat supplied. | Th.Eqvt. Wk.done. | Loss to friction. | Loss to jackets. | Exh.Radiation & pumping (diffce.) 600 | 100 | 24.7 | 2.655 | 25.5 | 47.2 750 | 100 | 24.3 | 3.26 | 21.5 | 50.6 1000 | 100 | 23.9 | 3.41 | 17.38 | 55.4 1250 | 100 | 25.77 | 4.28 | 20.0 | 50.6 1500 | 100 | 24.9 | 4.59 | 17.75 | 42.9 1750 | 100 | 24.4 | 4.86 | 17.64 | 53.2 2000 | 100 | 23.95 | 5.57 | 17.12 | 53.5 STD. 40/50 R-R CONTD :- Ht. Distribution Expressed as % of Ht. Supplied. 500 | 100 | 18.2 | 3.14 | 30.82 | 47.84 750 | 100 | 18.26 | 2.98 | 28.77 | 49.99 1000 | 100 | 20.15 | 3.54 | 31.02 | 45.30 1250 | 100 | 20.0 | 4.00 | 26.3 | 49.7 1500 | 100 | 20.18 | 4.56 | 24.4 | 50.8 1750 | 100 | 20.13 | 5.37 | 24.0 | 50.49 2000 | 100 | 18.8 | 6.30 | 22.8 | 52.1 | ||