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).
Performance graph showing the specified and actual output of a 20 HP dynamo.
| Identifier | ExFiles\Box 39\2\ Scan081 | |
| Date | 1st February 1926 | |
| 20 H.P. TEMP = 80°C SPECIFIED OUTPUT CURVE TAKEN ON ACTUAL CHASSIS CIRCUIT OUTPUT OF 20 H.P. R.R. DYNAMO ON PRESENT PRODUCTION M.7° C.120° AMPERE OUTPUT APPROX OPERATING VOLTAGE DYNAMO R.P.M. CHASSIS M.P.H. 11/50 AXLE. 31.4" DIA: TYRES. F.J.A. 1-2-26 | ||