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 of a starter motor.
| Identifier | ExFiles\Box 35\4\ scan 111 | |
| Date | 7th March 1922 | |
| MOTOR FORM 5. Brushes 7° advance 5 X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 7.3.22 Motor under test:- R.R. Goshawk Dia. of brake wheel:) 10" No:- 5 Weight of pan and portion of rope = 4lbs. 14ozs. Reduction gear ratio:- Load in pan (W) | 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. 12 | 1 0 | 453 | 177.0 | 8.46 | 11.0 | 15.88 | 79.4 | .57 | 2.01 | .283 10 | 1 7 | 608 | 160.0 | 8.80 | 8.9 | 13.44 | 67.2 | .65 | 1.89 | .344 8 | 1 8 | 780 | 141.0 | 9.18 | 6.8 | 11.38 | 56.9 | .705 | 1.74 | .405 6 | 1 10 | 1000 | 121.0 | 9.58 | 4.6 | 9.25 | 46.3 | .74 | 1.555 | .476 4 | 1 6 | 1240 | 104.0 | 9.92 | 2.10 | 7.5 | 37.5 | .74 | 1.38 | .536 2 | 1 2 | 1510 | 86.0 | 10.28 | .14 | 5.75 | 28.8 | .69 | 1.18 | .584 0 | 1 0 | 1882 | 68.0 | 10.64 | -1.0 | 3.88 | 19.4 | .58 | .97 | .598 22.2.22. | ||