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 a Lucas A880 starter motor.
| Identifier | ExFiles\Box 51\5\ Scan072 | |
| Date | 9th December 1921 | |
| MOTOR FORM 5. X. 4342L. X.300-9 - BRAKE TEST OF STARTER MOTOR. Date:- 9/12.21 Motor under test:- Lucas. A880 Dia. of brake wheel - 10" No:- Weight of pan and portion of rope 5 lbs. 1 ozs. Reduction gear ratio - 1 | Load in pan (W) | Spring Balance reading (S) lbs.ozs. | Speed R.P.M. | Amps. | Volts | E.F. (S-S) (lbs) | T-t (lbs) | Torque (lb-ins) | B.H.P. | E.H.P. | Efficiency | |---|---|---|---|---|---|---|---|---|---|---| | 11 | 0 11 | 530 | 206.5 | 7.87 | 10 5 | 15.38 | 76.9 | .65 | 2.18 | .298 | | 10 | 0 13 | 650 | 197.0 | 8.06 | 9 3 | 14.25 | 71.3 | .74 | 2.13 | .347 | | 9 | 0 10 | 730 | 188.0 | 8.24 | 8 6 | 13.44 | 67.2 | .78 | 2.08 | .375 | | 8 | 1 0 | 880 | 176.0 | 8.48 | 7 0 | 12.06 | 60.3 | .84 | 2.00 | .420 | | 7 | 0 14 | 975 | 166.0 | 8.68 | 6 2 | 11.19 | 56.0 | .87 | 1.93 | .451 | | 6 | 0 9 | 1054 | 158.0 | 8.84 | 5 7 | 10.50 | 52.5 | .88 | 1.87 | .471 | | 5 | 0 15 | 1238 | 144.0 | 9.12 | 4 1 | 9.13 | 45.7 | .90 | 1.76 | .512 | | 4 | 1 13 | 1562 | 122.0 | 9.56 | 2 3 | 7.25 | 36.3 | .90 | 1.56 | .577 | | 3 | 1 12 | 1730 | 111.0 | 9.78 | 1 4 | 6.31 | 31.6 | .87 | 1.46 | .596 | 19.6.21. | ||