Brake test report for a R.R. Goshawk starter motor with brushes 75% advanced.
| Identifier | ExFiles\Box 35\4\ scan 102 | |
| Date | 22th February 1922 | |
| MOTOR FORM 5. With brushes 75% advanced X.3009. BRAKE TEST OF STARTER MOTOR. Date:- 22-2-22. Motor under test:- R.R. Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) Dia. of brake wheel - 10" No:- 2 Weight of pan and portion of rope= 4 lbs. 14 ozs. Reduction gear ratio -- [Table of results] Load in pan (W) (lbs) | Spring balance reading. (S) lbs. ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) | T-t (lbs) | Torque (lb-ins) | B.H.P. | E.H.P. | Efficiency. 3 | 10 | 1298 | 91.0 | 10.18 | 2 6 | 7.25 | 36.3 | .75 | 1.24 | .604 2 | 9 | 1428 | 82.0 | 10.36 | 1 7 | 6.31 | 31.6 | .72 | 1.14 | .632 1 | 12 | 1600 | 72.0 | 10.56 | 4 | 5.13 | 25.7 | .65 | 1.02 | .637 0 | 13 | 1820 | 62.0 | 10.76 | -13 | 4.06 | 20.3 | .59 | .89 | .663 [Faint handwritten calculations in empty rows below] B.H.P. column: .587, .550, .716 E.H.P. column: .894, 1.018, 1.138 Efficiency. column: .657, .641, .629 19.5.21. | ||
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).