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).
Graph of comparative ampere output curves for R.R. 20 HP and Lucas E.575 dynamos under hot conditions.
| Identifier | ExFiles\Box 51\1\ Scan361 | |
| Date | 5th July 1924 | |
| COMPARATIVE AMPERE OUTPUT CURVES. OF R.R 20 H.P AND LUCAS E.575. DYNAMOS. (HOT CONDITION 80°C) OPERATING VOLTAGE: 15.35 15.1 14.85 14.35 14.1 13.85 13.6 AMPERE OUTPUT. MIN: SPECIFIED OUTPUT. DYNAMO. For 40/50 CAR. LUCAS E.575 R.R. 20 H.P. DYNAMO R.P.M. 0 5.5 11.0 16.5 22.0 27.5 33.0 38.5 44.0 49.5 20 H.P. CHASSIS M.P.H. For 1/50 Axle. 0 7.7 15.4 23.1 30.8 38.4 46.0 53.7 61.3 69.0. 40/50 HP CHASSIS M.P.H. For 15/52 Axle. (TAKING DYNAMO SPEED = 1 1/2 ENGINE SPEED) NEW. F.X.C.4 T.P.6.A H.E.S.W./5.7.24 | ||