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 output speed performance curves for a 48 coil 20/25 dynamo at 80°C.
| Identifier | ExFiles\Box 57\1\ Scan048 | |
| Date | 4th December 1930 | |
| 20/25 AMPERE OUTPUT. APPROX: OPERATING VOLTAGE. OUTPUT SPEED PERFORMANCE CURVES OF 48 COIL. 20/25 DYNAMO AT 80°C. (+2° 123.5°) BRUSH SETTING TEMPERATURE RISE 65°C. I. AT SCHEDULE TERMINAL VOLTAGES. II. AT A CONSTANT TERMINAL VOLTAGE OF 14.0 III. AS I. BUT WITH A FIELD RESISTANCE OF 25" OF 26 S.W.G. EUREKA WIRE. (1.8 OHMS.) DYNAMO R.P.M. CHASSIS M.P.H. 11/50 AXLE. 31.4" DIA. TYRES. F.J.A. | ||