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).
Brake test results for a Goshawk starter motor with brushes 3° advanced.
| Identifier | ExFiles\Box 35\4\ scan 113 | |
| Date | 9th March 1922 | |
| MOTOR FORM 5. With brushes 3° advanced 6 X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 9.3.22 Motor under test:- R.R. Goshawk Dia. of brake wheel:- 10" No:- 6 Weight of pan and portion of rope 4 lbs. 14 ozs. Reduction gear ratio:- — Load in pan. (W) (lbs) | Spring balance reading. (s) lbs. ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) lbs. ozs | T = t (lbs) | Torque (lb-ins) | B.H.P. | E.H.P. | Efficiency. --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- 12 | 1 | 5 | 568 | 164.0 | 8.72 | 10 | 11 | 15.56 | 77.8 | .70 | 1.92 | .365 10 | 1 | 14 | 712 | 145.0 | 9.10 | 8 | 2 | 13.0 | 65.0 | .735 | 1.77 | .415 8 | 2 | 1 | 910 | 126.0 | 9.48 | 5 | 15 | 10.81 | 54.1 | .78 | 1.60 | .487 6 | 2 | 0 | 1090 | 110.0 | 9.80 | 4 | 0 | 8.88 | 44.4 | .77 | 1.45 | .531 4 | 1 | 12 | 1292 | 94.0 | 10.12 | 2 | 4 | 7.13 | 35.7 | .73 | 1.27 | .575 2 | 1 | 10 | 1562 | 78.0 | 10.44 | 1 | 6 | 5.25 | 26.3 | .65 | 1.09 | .596 0 | 1 | 0 | 1812 | 64.0 | 10.72 | -1 | 0 | 3.88 | 19.4 | .56 | .92 | .609 22.2.22. | ||