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 | ||