Test data for starting a Goshawk engine with a standard starter motor under cold and hot conditions.
| Identifier | ExFiles\Box 51\5\ Scan005 | |
| Date | 15th April 1921 | |
| R R Derby copy form F 106. 10-11-20 C 5047 X4342 95215. EFC. {E. Fowler Clarke - Electrical Engineer} 15.4.21. FD. {Frank Dodd - Bodies} 88 X.4298. X.4342. X.3534. X.3082. STARTING OF GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) BY MEANS OF STANDARD R.R. STARTER MOTOR. COLD | Motor volts. | Amps. | R.P.M. speed. | Initial kick. | | 9.5 | 96 | 85 | 125 amps. | | 9.5 | 96 | 85 | -- | HOT | 10.65 | 47.0 | 140 | 80 amps. | | 10.65 | 48.0 | 145 | -- | Reduction ratio 12 : 1 Torque about 40 lb-inches. i.e. 480 on engine. LF. | ||
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).