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).
Torque curve data table for a 20 HP engine.
| Identifier | ExFiles\Box 5a\5\ 05-page110 | |
| Date | 19th March 1930 | |
| EJJ. From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} X8771 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}3/MJ.19.3.30. X634 TORQUE CURVE. 20 HP. ENGINE. ENGINE R.P.M. | FLYWHEEL TORQUE LBS.FT. 500 | 170 1000 | 170 1500 | 165 2000 | 165 2500 | 150 3000 | 135 3500 | 100 | ||