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).
Output speed performance curves for three different 20/25 dynamos.
| Identifier | ExFiles\Box 68\4\ scan0315 | |
| Date | 16th January 1931 | |
| FJA 20/25 AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 X.5661. X.5663. X.6005 OUTPUT SPEED PERFORMANCE CURVES OF 20/25 DYNAMOS. I 56 COIL STANDARD MACHINE (58 C° SETTING) 8° 123.5° II 48 COIL HIGH OUTPUT MACHINE (65 C° SETTING) 12° 123.5° III 56 COIL MACHINE WITH EJB POLES (58 C° SETTING) 14° 123.5° DYNAMO R.P.M. CHASSIS M.P.H. 11/50 AXLE 31.4" DIA:TYRES F.J.A. 15.1.31. E.F.F.C. 15.1.31. S.S.C 16.1.31 6.1.31 | ||