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 speed curves of a 56 coil machine versus a proposed 48 coil machine.
| Identifier | ExFiles\Box 60\4\ Scan061 | |
| Date | 1st December 1930 | |
| 10 20/25 AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 OUTPUT SPEED CURVES 1. 56 COIL MACHINE AS AT PRESENT FITTED (65 C° SETTING) 2. 48 COIL MACHINE PROPOSED STANDARD (65 C° SETTING) DYNAMO R.P.M. CHASSIS M.P.H. 11/50 AXLE 31-4" DIA TYRES Y-Axis: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 X-Axis (Dynamo RPM): 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600, 3800, 4000 X-Axis (Chassis MPH): 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 | ||