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 of representative output curves for a standard 20 HP dynamo under various conditions.
| Identifier | ExFiles\Box 180\M2\M2.7\ img027 | |
| Date | 24th March 1927 | |
| AMPERE OUTPUT OPERATING VOLTAGES 0 1 13.6 2 13.7 3 13.85 4 14.0 5 14.1 6 14.2 7 14.35 8 14.5 9 14.6 10 14.7 11 14.85 12 15.0 13 15.1 Output at 70°C set by General Specification. Output at 20°C set by General Specification. Output at 20°C set to production test. Ditto minus ignition current. (1) (2) (3) (4) (5) REPRESENTATIVE OUTPUT CURVES OF STANDARD 20 H.P. DYNAMO UNDER VARIOUS CONDITIONS. Field current at 70°C set by General Specification. CHASSIS M.P.H 11/50 AXLE 31.4" DIA TYRES. DYNAMO R.P.M. 0 5 10 15 20 25 30 35 40 45 50 55 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 A.D. 638 24.3.27 | ||