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 C.A.V. Type S.C. starter motor.
| Identifier | ExFiles\Box 51\5\ Scan177 | |
| Date | 21th October 1921 | |
| X. 4342 V.. MOTOR FORM 5. X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 21.10.21 Motor under test:- C.A V. {VIENNA} Dia. of brake wheel = 10 No.:- 85 Type S.C Reduction gear ratio = 1 Weight of pan and portion of rope 5 lbs. 1 ozs. Load in pan (W) | Spring balance reading (S) lbs.ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) | T-t (lbs) | Torque (lb-inches). | B.H.P | E.H.P. | Efficiency 18 | 4 | 8 | 570 | 192.0 | 8.16 | 13 | 8 | 18.56 | 92.8 | .84 | 2.10 | .400 17 | 4 | 5 | 630 | 186.0 | 8.28 | 12 | 11 | 17.75 | 88.8 | .89 | 2.07 | .430 15 | 3 | 12 | 734 | 176.0 | 8.48 | 11 | 4 | 16.31 | 81.6 | .95 | 2.00 | .475 13 | 3 | 4 | 840 | 164.0 | 8.72 | 9 | 12 | 14.81 | 74.1 | .99 | 1.92 | .515 11 | 3 | 6 | 990 | 146.3 | 9.07 | 7 | 10 | 12.69 | 63.5 | 1.00 | 1.78 | .561 10 | 3 | 0 | 1040 | 140.1 | 9.20 | 7 | 0 | 12.06 | 60.3 | 1.00 | 1.73 | .577 8 | 2 | 6 | 1153 | 127.7 | 9.45 | 5 | 10 | 10.69 | 53.5 | .98 | 1.62 | .605 6 | 2 | 3 | 1324 | 113.0 | 9.74 | 3 | 13 | 8.88 | 44.4 | .94 | 1.48 | .635 4 | 1 | 13 | 1532 | 98.9 | 10.02 | 2 | 3 | 7.25 | 36.3 | .88 | 1.32 | .666 | ||