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 starter motor model A2, detailing performance metrics under various loads.
Identifier | ExFiles\Box 64\1\ scan0299 | |
Date | 1st December 1926 | |
MOTOR FORM 5. X.3009 - BRAKE TEST OF STARTER MOTOR Date:- 1-12-26 Motor under test:- A2 Dia. of brake wheel:- 24" No:- Weight of pan and portion of rope 5 lbs. 0 ozs. Reduction of epicyclic gear ratio:- 96:31 | Motor torque (lb-ins) | Load in pan (W) (lbs) | Spring balance reading (S) lbs. 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) | |---|---|---|---|---|---|---|---|---|---|---|---| | 26.2 | 2 | 3 1/2 | 1470 | 86 | 10.28 | 1.781 | 6.781 | 81.37 | .613 | 1.184 | .518 | | 18.6 | 0 | 3 | 1665 | 71 | 10.58 | -.190 | 4.81 | 57.72 | .493 | 1.006 | .490 | | — | wheel only. | — | 2640 | 32 | 11.36 | — | — | — | 0 | .487 | 0 | | 31.0 | 3 1/2 | 8 | 1330 | 100 | 10.00 | 3.00 | 8.0 | 96.00 | .655 | 1.340 | .488 | | 22.2 | 1 | 4 | 1572 | 79 | 10.42 | .750 | 5.750 | 69.00 | .556 | 1.102 | .505 | 17.7.26. | ||