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 output curves for a Standard R 20 HP dynamo under various conditions.
| Identifier | ExFiles\Box 51\1\ Scan402 | |
| Date | 27th August 1924 guessed | |
| Y.4783 E.T.C AMPERE OUTPUT OPERATING VOLTAGES Output at 10°C set by General Specification Output at 85°C set by General Specification General specification Output at 26°C set to permutation test Delta minus ignition current REPRESENTATIVE OUTPUT CURVES OF STANDARD R 20 H.P. DYNAMO UNDER VARIOUS CONDITIONS (9.5 COIL) Field current at 13.8v set by General Specification DYNAMO R.P.M. CHASSIS M.P.H. 11/50 AXLE 33x5 TYRES | ||