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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.
  
  


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