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 main-brush position tests for a Goshawk dynamo, plotting ampere output against RPM under various conditions.
| Identifier | ExFiles\Box 50\5\ Scan177 | |
| Date | 27th November 1933 | |
| AMPERE OUTPUT DYNAMO R.P.M. IV 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. CURVE A Brushes 4° retarded 78°C " B " 3° " 78°C " C " 2° " 78°C " D " 1° " 79.5°C " N " in neutral position 77°C " E " 1° advanced 77°C " F " 2° " 79°C Positions measured circumferentially on carcase from neutral position. Graph Labels: 4x3, 2, 1, N, 1st, 2nd, A, B, C, D, E, F | ||