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 showing the output speed performance curves of a 48 coil medium output machine.
| Identifier | ExFiles\Box 62\3\ scan0097 | |
| Date | 6th January 1931 | |
| AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 X.6004 OUTPUT SPEED PERFORMANCE CURVES OF 48 COIL MEDIUM OUTPUT MACHINE AT 80°C WITHOUT & WITH 6" FIELD RESISTANCE DYNAMO R.P.M PH II CHASSIS M.P.H WITH 11/41 AXLE & 33.0" TYRE DIA. 40/50 2 C.A.P 6.1.31 E.F.C 6.1.31 | ||