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 20/25 dynamos.
| Identifier | ExFiles\Box 60\4\ Scan047 | |
| Date | 25th March 1931 | |
| AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 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° A LUCAS MODEL C5-0 TYPE N.O (MAKER'S SETTING) 5° 115° B LUCAS MODEL C5-0 TYPE N.O (58 C° SETTING) 5° 117° DYNAMO R.P.M. CHASSIS M.P.H 1 1/50 AXLE 31.4" DIA TYRES F.J.A. 25.3.31 20/25 2 | ||