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).
Performance graph of main-brush position tests on a Goshawk dynamo, plotting ampere output against dynamo RPM.
| Identifier | WestWitteringFiles\J\May1923\ Scan34 | |
| Date | 25th May 1933 | |
| III HJL / 25-5-33 E-70 MAIN-BRUSH POSITION TESTS ON R GOSHAWK DYNAMO, WITH 140-TURN 20 S.W.G. FIELD-COILS Control brush adjusted in each case to give a final Temperature of from 70° to 75°C, at maximum load. Final ambient temperature 20°C. CURVE 5 Brushes .5° retarded (ambt.) 43.5°C " 4 " .4° " 42°C " 3 " .3° " 40°C " 1 " in neutral position 43.5°C N Positions measured circumferentially from neutral position. AMPERE OUTPUT DYNAMO R.P.M. Curve Labels on graph: 5, 4, 3, 1, N. At low RPM: 5,4&3, 1, N. | ||