Rolls-Royce Archives
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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 results for an R.R. Goshawk starter motor with brushes fully advanced.

Identifier  ExFiles\Box 35\4\  scan 103
Date  24th February 1922
  
MOTOR FORM 5.
With brushes fully advanced.
X.3009. BRAKE TEST OF STARTER MOTOR.
Date:- 24.2.22 Motor under test:- R.R. Goshawk Dia. of brake wheel - 10"
No:- 2 Weight of pan and portion of rope = 4 lbs. 14 ozs. Reduction gear ratio - -

| Load in pan (W) lbs. | Spring balance reading. (S) lbs. ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) | T-t (lbs) | Torque (lb-ins) | B.H.P. | E.H.P. | Efficiency. |
|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 2 6 | 634 | 160.0 | 8.80 | 9 10 | 14.50 | 72.5 | .73 | 1.89 | .386 |
| 11 | 2 6 | 682 | 153.0 | 8.94 | 8 10 | 13.50 | 67.5 | .73 | 1.83 | .399 |
| 10 | 2 5 | 738 | 144.0 | 9.12 | 7 11 | 12.56 | 62.8 | .74 | 1.76 | .421 |
| 9 | 2 4 | 810 | 136.0 | 9.28 | 6 12 | 11.63 | 58.2 | .75 | 1.69 | .444 |
| 8 | 1 9 | 840 | 133.0 | 9.34 | 6 7 | 11.31 | 56.6 | .76 | 1.66 | .457 |
| 7 | 1 7 | 920 | 126.0 | 9.48 | 5 9 | 10.44 | 52.2 | .76 | 1.60 | .475 |
| 6 | 1 6 | 1016 | 117.0 | 9.66 | 4 10 | 9.50 | 47.5 | .77 | 1.52 | .507 |
| 5 | 1 3 | 1110 (1100) | 110.0 | 9.80 | 3 13 | 8.69 | 43.5 | .76 | 1.45 | .524 |
| 4 | 1 2 | 1217 | 101.0 | 9.82 | 2 14 | 7.75 | 38.8 | .75 | 1.35 | .556 |

19.5.21
  
  


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