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 Main-Brush Position Tests for a Goshawk Dynamo, plotting Ampere Output vs Dynamo RPM.
| Identifier | ExFiles\Box 51\1\ Scan150 | |
| Date | 20th February 1934 | |
| Y4383 III AMPERE OUTPUT DYNAMO R.P.M. MAIN-BRUSH POSITION TESTS ON RR GOSHAWK DYNAMO WITH 140-TURN 20 S.W.G. FIELD-COILS Control brush adjusted in each case to give a final temperature of from 72 to 78°C at maximum load Final ambient temperature 20°C CURVE & Brushes Q Retarded 11·45° - Curve 4 - Brushes Q Retarded 78°C 9·16° - Curve 5 - Brushes Q Retarded 78°C 6·87° - Curve 3 - Brushes Q Retarded 72°C 2·29° - Curve 1 - Brushes Q Retarded 80°C? 0° - Curve N - In neutral position 80°C? Position measured circumferentially on carcase from neutral position. JWH 20.2.34 | ||