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 starter motor.
| Identifier | ExFiles\Box 35\4\ scan 098 | |
| Date | 2nd February 1922 | |
| MOTOR FORM 5. X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 2.2.22. Motor under test:- R.R. Goshawk Dia. of brake wheel - 10" No:- 1. Weight of pan and portion of rope 5lbs. 0ozs. 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 . 6 | 490 | 160.0 | 8.80 | 10 | 10 | 15.63 | 78.2 11 | 1 ' 4 | 495 | 155.0 | 8.90 | 9 | 12 | 14.75 | 73.8 10 | 1 ' 1 | 538 | 152.0 | 8.96 | 8 | 15 | 13.94 | 69.7 9 | 1 ' 1 | 640 | 140.0 | 9.20 | 7 | 15 | 12.94 | 64.7 8 | ' 15 | 720 | 132.0 | 9.36 | 7 | 1 | 12.06 | 60.3 7 | ' 15 | 820 | 122.0 | 9.56 | 6 | 1 | 11.06 | 55.3 6 | 1 ' 1 | 912 | 116.0 | 9.68 | 4 | 15 | 9.94 | 49.7 5 | 1 ' 0 | 972 | 107.0 | 9.86 | 4 | 0 | 9.00 | 45.0 4 | ' 13 | 1195 | 92.0 | 10.16 | 3 | 3 | 8.19 | 41.0 19.5.21. | ||