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).
The power curve data for engine 31-GX, showing horsepower at various RPMs.
| Identifier | ExFiles\Box 92\2\ scan0155 | |
| Date | 2nd February 1932 | |
| To PN.{Mr Northey} From Hs.{Lord Ernest Hives - Chair} 8771 Hs.{Lord Ernest Hives - Chair}5/MJ.2.2.32. The power curve of 31-GX. taken at the engine flywheel with free exhaust, is as follows :- At 750 R.P.M. 46 HP. 1000 62 HP. 1250 79 HP. 1500 91 HP. 1750 104 HP. 2000 116 HP. 2250 127 HP. 2500 137 HP. 2750 140 HP. 3000 138 HP. 3250 133 HP. Hs.{Lord Ernest Hives - Chair} | ||