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 097 | |
| Date | 2nd February 1922 | |
| MOTOR FORM 5. Prelim Crank X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 2.2.22 Motor under test:- R.{Sir Henry Royce} R.{Sir Henry Royce} Gos. Dia. of brake wheel - 10" No:- 1 Weight of pan and portion of rope 5 lbs. 3 ozs. Reduction gear ratio - 5.19 5 No ay Load in pan (W) | Spring balance reading (S) lbs.ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) | T-t (lbs) | Torque (ln-ins) | B.H.P. | E.H.P. | Efficiency Adv | 12 | 1 . 0 | 472 | 166 | 8.68 | 11.00 | 16.19 | 80.95 | .607 | 1.93 | .314 Cent | 12 | . 14 | 454 | 167 | 8.66 | 11.12 | 16.31 | 81.55 | .588 | 1.94 | .303 Ret: | 12 | 2 . 2 | 350 | 185 | 8.27 | 9.88 | 15.07 | 75.35 | .418 | 2.05 | .204 Adv. | 8 | 1 . 7 | 780 | 132 | 9.36 | 6.56 | 11.62 | 58.10 | .720 | 1.66 | .434 Cent | 8 | 1 . 2 | 762 | 134 | 9.32 | 6.88 | 11.94 | 59.70 | .722 | 1.67 | .432 Ret | 8 | 1 . 4 | 596 | 160 | 8.80 | 6.75 | 11.81 | 59.05 | .559 | 1.89 | .296 19.6.21. | ||