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 of a dynamo for a 20 HP chassis, plotting ampere output and operating voltage against dynamo RPM and chassis MPH.
| Identifier | ExFiles\Box 165\6\ img243 | |
| Date | 1st December 1929 guessed | |
| AMPERE OUTPUT APPROX. OPERATING VOLTAGE 18.7 18.5 18.3 18.1 17.9 17.7 17.5 17.3 17.05 16.8 16.5 16.2 15.9 15.55 15.2 14.8 14.4 14.0 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 P 20 H.P. DYNAMO R.P.M. 200 400 600 800 1000 1200 1400 1600 1800 CHASSIS M.P.H. 11/50 AXLE 0 5 10 15 20 25 | ||