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 ampere output versus dynamo RPM from main-brush position tests on a Goshawk dynamo.
| Identifier | ExFiles\Box 51\1\ Scan151 | |
| Date | 29th March 1923 | |
| X.4383 IV AMPERE OUTPUT DYNAMO R.P.M. MAIN-BRUSH POSITION TESTS OF R GOSHAWK DYNAMO WITH THICK CARCASE AND SMALL AIR-GAP. Control brush adjusted in each case, to give a final temperature of from 77° to 80°C at maximum load. Final ambient temperature 21°C. 9.16" CURVE 4 Brushes 4° retarded 78°C 6.87" " 3 " 3° " 79°C 4.58" " 2 " 2° " 78°C 2.29" " 1 " 1° " 79.5°C O N - In neutral position 77°C 2.29" Ex1 1° advanced 77°C 4.58" Ex2 2° " 79°C Positions measured circumferentially on VEE RING from neutral position. | ||