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 the results of main-brush position tests on a Goshawk Dynamo, plotting ampere output against dynamo RPM.
| Identifier | ExFiles\Box 50\5\ Scan176 | |
| Date | 7th February 1934 | |
| MAIN-BRUSH POSITION TESTS OF R.R. GOSHAWK DYNAMO WITH 140-TURN 20 S.W.G. FIELD-COILS Shunted in each case to give a final temp. rise of from 21°C to 70°C. at maximum load. Final ambient temperature 20°C. CURVE S Brushes - 5° retarded 73.5°C CURVE A " - 4° " 72°C CURVE B " - 3° " 72°C CURVE I " - 1° " 73.5°C CURVE N "in neutral position 73.5°C" Positions measured circumferentially on carcase from neutral position. AMPERE OUTPUT DYNAMO R.P.M. III J.M. 7-2-34 | ||