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 report for an RR Goshawk starter motor.
| Identifier | ExFiles\Box 35\4\ scan 106 | |
| Date | 9th March 1922 | |
| MOTOR FORM 5. Brushes 3.5° advanced from neutral. (75%) 4 X. 3009 - BRAKE TEST OF STARTER MOTOR. Date:- 9. 3. 22 Motor under test:- RR Goshawk Dia. of brake wheel:) 10 No:- 4 Weight of pan and portion of rope = 4 lbs. 14 ozs. Reduction gear ratio:- -- Load in pan (w) lbs, ozs. | 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 3 | 554 | 162.0 | 8.76 | 10 13 | 15.69 | 78.5 | .69 | 1.90 | .363 10 | 1 4 | 674 | 146.0 | 9.08 | 8 12 | 13.63 | 68.2 | .73 | 1.78 | .410 8 | 1 8 | 862 | 126.0 | 9.48 | 6 8 | 11.38 | 56.9 | .78 | 1.60 | .487 6 | 1 13 | 1092 | 108.0 | 9.84 | 4 3 | 9.06 | 45.3 | .79 | 1.43 | .552 4 | 1 12 | 1322 | 91.0 | 10.18 | 2 4 | 7.13 | 35.7 | .75 | 1.24 | .605 2 | 1 9 | 1582 | 75.0 | 10.50 | 7 | 5.31 | 26.6 | .67 | 1.06 | .632 0 | 1 3 | 1920 | 59.0 | 10.82 | -1 3 | 3.69 | 18.5 | .56 | .86 | .652 22.2.22. Brushes 4° advanced | ||