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).
Dynamo output curves for a 20 HP chassis.
| Identifier | ExFiles\Box 51\1\ Scan226 | |
| Date | 5th September 1923 | |
| X4383 To EP. {G. Eric Platford - Chief Quality Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} EFC {E. Fowler Clarke - Electrical Engineer} 5/T5.9.23. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ X.4383 - 20 H.P. R.R. CHASSIS DYNAMO OUTPUT. In response to your telephone message, we are sending you herewith photostat curves (two copies) of the average output of this dynamo at 82°C, a temperature at which it is likely to be working in normal running conditions on the chassis. This shows two curves, one of which is the actual dynamo output, and the other the current actually going into the battery, the ignition current having been automatically subtracted on the bench. The setting of the dynamo is in accordance with our very latest specification of production test, which you will remember involved a reduction of 1 ampere, under production test conditions, in the peak output, resulting as it does in slightly more than the reduction of 1 ampere in the actual output curve under chassis conditions. EFC. {E. Fowler Clarke - Electrical Engineer} | ||