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 sheet showing heat flow to cooling water under various throttle, load, and compression ratio conditions.
| Identifier | WestWitteringFiles\K\September1923\ Scan28 | |
| Date | 12th July 1923 guessed | |
| SHEET 3. HEAT FLOW - THROTTLED AND FULL THROTTLE. HEAT FLOW TO COOLING WATER - UNDER THROTTLE AND FULL LOAD CONDITIONS WITH HIGH AND LOW COMPRESSION. | | Low compression - ratio 3.9 | | High compression - ratio 4.4 | |---|---|---|---|---| | | Full throttle. | Throttled 1/2 power. | Full throttle. | Throttled 1/2 power. | | R.P.M. | Pts. hr. | HP. | B.Th. U's min. | Pts. hr. | HP. | B.Th. U's min. | Pts. hr. | HP. | B.Th. U's min. | Pts. hr. | HP. | B.Th. U's min. | | 500 | 18.09 | 23.1 | 1660 | 11.1 | 11.5 | 1107 | 18 | 23.6 | 1714.8 | 13.3 | 10.21 | 1180.8 | | 750 | 26.27 | 33.67 | 2250 | 15.6 | 17.18 | 1518.75 | 27 | 35.3 | 1994.5 | 17.1 | 17.5 | 1687.5 | | 1000 | 32.14 | 45.42 | 2970 | 19.6 | 22.71 | 1930.5 | 34 | 47.3 | 2385.9 | 21.1 | 23.54 | 2062 | | 1250 | 40.45 | 56.75 | 3167 | 25.1 | 27.76 | 2235.6 | 44 | 59.6 | 2952.2 | 26.1 | 29.68 | 2421.9 | | 1500 | 46.75 | 66.25 | 3402 | 30.6 | 33.75 | 2721.6 | 49 | 70.3 | 3571.9 | 31.1 | 35.0 | 2608.2 | | 1750 | 52.9 | 74.75 | 3780 | 34.6 | 37.18 | 2835 | 56.5 | 76.2 | 3578.6 | 35.1 | 37.9 | 2835.0 | | 2000 | 58.53 | 77.29 | 3982.5 | 38.6 | 39.6 | 3186 | 59 | 82.5 | 3901.5 | 40.1 | 41.25 | 3026.7 | | ||