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 starter motor.
| Identifier | ExFiles\Box 64\1\ scan0298 | |
| Date | 1st December 1926 | |
| MOTOR FORM 5. X. 7620 Date:- 1-12-26 No:- X.3009 - BRAKE TEST OF STARTER MOTOR. Motor under test:- A2 Dia. of brake wheel:- 24" Weight of pan and portion of rope 5 lbs. 0 ozs. Reduction of epicyclic gear ratio:- 96:31 Table Headers: Motor Torque (lb-ins), Load in pan (W) (lbs), Spring balance reading (S) lbs, Spring balance reading (S) ozs, Armature speed R.P.M., Amps, Terminal Volts, W-S (lbs), T-t (lbs), Brake Torque (lb-ins.), B.H.P., E.H.P., Efficiency (including epic. gear) Table Data: Row 1: 94.8, 20, , 8, 370, 202, 7.96, 19.500, 24.500, 294.0, .557, 2.155, .259 Row 2: 87.2, 18, , 8, 470, 192, 8.16, 17.500, 22.500, 270.0, .651, 2.10, .310 Row 3: 79.5, 16, , 8, 530, 178, 8.44, 15.500, 20.500, 246.0, .669, 2.01, .332 Row 4: 71.7, 14, , 8, 630, 166, 8.68, 13.500, 18.500, 222.0, .717, 1.931, .371 Row 5: 64.1, 12, , 7½, 734, 154, 8.92, 11.532, 16.532, 198.4, .747, 1.840, .406 Row 6: 56.4, 10, , 7, 889, 141, 9.18, 9.563, 14.563, 174.8, .796, 1.736, .458 Row 7: 48.9, 8, , 6, 985, 129, 9.42, 7.625, 12.625, 151.5, .766, 1.629, .470 Row 8: 41.3, 6, , 5½, 1134, 116, 9.68, 5.657, 10.657, 127.9, .744, 1.505, .494 Row 9: 33.8, 4, , 4½, 1274, 102, 9.96, 3.719, 8.719, 104.6, .683, 1.360, .502 17.7.26. | ||