Brake test results for a R.R. Goshawk starter motor with brushes fully advanced.
| Identifier | ExFiles\Box 35\4\ scan 104 | |
| Date | 24th February 1922 | |
| MOTOR FORM 5. With brushes fully advanced X.3009 - BRAKE TEST OF STARTER MOTOR. Date:- 24.2.22 No:- 2 Motor under test:- R.R. Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). Dia. of brake wheel:) 10 Weight of pan and portion of rope - 4 lbs. 14 ozs. Reduction gear ratio:- - Load in pan (W) | Spr.ng Balance Reading (S) lbs. ozs. | Speed R.P.M. | Amps. | Volts. | W-S (lbs) | T-t (lbs) | Torque (lb-ins) | E.M.F. | B.H.P. | Efficiency. 3 | 1 | 1 | 1344 | 92.0 | 10.16 | Noisy 1 | 15 | 6.81 | 34.1 | .73 | 1.25 | .584 2 | | 12 | 1466 | 86.0 | 10.28 | 1 | 4 | 6.13 | 30.7 | .715 | 1.18 | .606 1 | | 11 | 1640 | 78.0 | 10.44 | 5 | 5.19 | 26.0 | .68 | 1.09 | .624 0 | | 7 | 1820 | 71.0 | 10.58 | -| 4 | 4.40 | 22.0 | .64 | 1.01 | .634 22.2.22. | ||
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).