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 comparing the ampere output curves of RR 20 HP and Lucas E.575 dynamos under hot conditions.
| Identifier | ExFiles\Box 51\1\ Scan356 | |
| Date | 15th May 1928 | |
| COMPARATIVE AMPERE OUTPUT CURVES. OF RR 20 HP AND LUCAS E.575. DYNAMOS. (HOT CONDITION 80°C) OPERATING VOLTAGE 15.35 15.1 14.85 14.6 14.35 14.1 13.85 13.6 AMPERE OUTPUT. 14 12 10 8 6 4 2 0 MIN: SPECIFIED OUTPUT. DYNAMO FOR 40/50 CAR. LUCAS E.575 R.R. 20 H.P. DYNAMO R.P.M. 0 400 800 1200 1600 2000 2400 2800 3200 3600 0 5.5 11.0 16.5 22.0 27.5 33.0 38.5 44.0 20 HP CHASSIS M.P.H. For 11/50 Axle. 0 7.7 15.4 23.1 30.8 38.4 46.0 53.7 61.4 40/50 HP CHASSIS. M.P.H. FOR 15/52 Axle. (TAKING DYNAMO SPEED = 1 1/2 ENGINE SPEED) M.E.W / 15.5.28 E.T.G. 69 | ||