Performance graph of main-brush position tests on a Standard 'R' Goshawk Dynamo.
| Identifier | ExFiles\Box 50\5\ Scan179 | |
| Date | 3rd May 1923 guessed | |
| Y-Axis: AMPERE OUTPUT X-Axis: DYNAMO R.P.M. Top Left Table: OPERATING FIGURES Amps | Volts 1 | 13.95 2 | 13.75 3 | 13.50 4 | 13.20 5 | 12.80 6 | 12.40 7 | 11.90 8 | 11.40 9 | 10.80 10 | 10.20 11 | 9.50 12 | 8.80 13 | 8.00 14 | 7.20 Center Text: MAIN-BRUSH POSITION TESTS OF STANDARD 'R' GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) DYNAMO Control brush adjusted in each case to give a final temperature of from 72°C to 78°C at maximum load. Final ambient temperature 20°C Curve Key: CURVE 4 Brushes 4° retarded 78°C " 3 " 3° " 78°C " 2 " 2° " 75°C " N " " in neutral position 78°C " 1 " 1° advanced 75°C " Rxd " 2° " 72°C Side Note: Positions measured circumferentially on carcase from neutral position Top Right: I Bottom Right: S3033 | ||
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).