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).
Table detailing the torque curve data for a 20 HP engine.
| Identifier | ExFiles\Box 137\4\ scan0081 | |
| Date | 19th March 1930 | |
| EJJ. From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} x634 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}3/MJ.19.3.30. x5771 TORQUE CURVE. 20 HP. ENGINE. ENGINE R.P.M. 500 1000 1500 2000 2500 3000 3500 FLYWHEEL TORQUE LBS.FT. 170 170 165 165 150 135 100 | ||