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).
Defining the conditions for standard dynamo output curves.
| Identifier | ExFiles\Box 51\1\ Scan311 | |
| Date | 27th November 1923 | |
| X4383 EFCl/T27.11.23. RE STANDARD DYNAMO OUTPUT CURVES. X.4383. X.9660 X.294. (1) There is the curve represented by the figures contained in the general specification of electrical performance. This curve is supposed to correspond to a temperature in the neighbourhood of, but not exceeding, 75° C. (2) There is the actual curve of the dynamo at that same temperature, the setting of the control brush being such as to allow the dynamo just to comply with the clause in the general specification referring to the limiting temperature on peak output. Thus the dynamo temperature for this output curve is from 70° to 75°C. (3) With the control brush so set, the numerical figures of the specification of production test are supposed to be such that the dynamo will comply with that specification. (4) Then there is the output curve of the dynamo at 85oC, at emperature which is supposed to be representative of the dynamo temperature in position on the engine and in a fully hot condition, with the control brush also in the same position. It is intended that this curve shall be representative of the output of the dynamo on the chassis. It may happen, as in the case of the GoshawkAero EngineCodename for 20HP Car / Aero Engine after KestrelAero Engine dynamo, that the output curve with the control brush so set Contd. | ||