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 representative Ampere output curves for a 20 HP dynamo under various operating conditions.
| Identifier | Morton\M2.7\ img027 | |
| Date | 4th March 1924 | |
| AMPERE OUTPUT OPERATING VOLTAGES 13: 15.2 12: 15.1 11: 15.0 10: 14.85 9: 14.7 8: 14.6 7: 14.5 6: 14.35 5: 14.2 4: 14.1 3: 14.0 2: 13.85 1: 13.7 0: 13.6 (1) Output at 70°c set by General Specification. (Dashed line) Ditto minus ignition current. (3) Output at 85°c set by General Specification. (Dashed line) Output at 85°c set to production test. (5) Field current at 70°c set by General Specification. REPRESENTATIVE OUTPUT CURVES OF STANDARD R 20 H.P. DYNAMO UNDER VARIOUS CONDITIONS CHASSIS M.P.H. 20 H.P. 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 0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 Handwritten: A/2-Z-24 E.T.C 4/3/24 | ||