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 a starter motor.

Identifier  ExFiles\Box 35\4\  scan 097
Date  2nd February 1922
  
MOTOR FORM 5.
Prelim Crank
X.300-9 - BRAKE TEST OF STARTER MOTOR.
Date:- 2.2.22
Motor under test:- R.{Sir Henry Royce} R.{Sir Henry Royce} Gos.
Dia. of brake wheel - 10"
No:- 1
Weight of pan and portion of rope 5 lbs. 3 ozs.
Reduction gear ratio -
5.19
5 No ay
Load in pan (W) | Spring balance reading (S) lbs.ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) | T-t (lbs) | Torque (ln-ins) | B.H.P. | E.H.P. | Efficiency
Adv | 12 | 1 . 0 | 472 | 166 | 8.68 | 11.00 | 16.19 | 80.95 | .607 | 1.93 | .314
Cent | 12 | . 14 | 454 | 167 | 8.66 | 11.12 | 16.31 | 81.55 | .588 | 1.94 | .303
Ret: | 12 | 2 . 2 | 350 | 185 | 8.27 | 9.88 | 15.07 | 75.35 | .418 | 2.05 | .204
Adv. | 8 | 1 . 7 | 780 | 132 | 9.36 | 6.56 | 11.62 | 58.10 | .720 | 1.66 | .434
Cent | 8 | 1 . 2 | 762 | 134 | 9.32 | 6.88 | 11.94 | 59.70 | .722 | 1.67 | .432
Ret | 8 | 1 . 4 | 596 | 160 | 8.80 | 6.75 | 11.81 | 59.05 | .559 | 1.89 | .296
19.6.21.
  
  


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