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 observation log for a K2 starter motor.
| Identifier | ExFiles\Box 64\1\ scan0303 | |
| Date | 29th August 1928 | |
| X. 7620 K2 STARTER MOTOR TESTS. FORM 1. BRAKE TEST. (OBSERVATIONS). Date:- 29. Aug 1928 Motor under test:- K2 Dia. of brake wheel:- 10" Weight of pan and portion of rope 0 lbs. 6 ozs. Reduction of epicyclic gear ratio:- | Load in pan (W) (lbs) | Spring balance reading (S) lbs. ozs. | Motor armature speed R.P.M. | Amp-eres. (C) | Terml. volts. (E) | W-S (lbs) | T-t (lbs) | Brake torque (lb.ins) (Tr{Capt. F. W. Turner - Finance}) | Equivalent torque at motor armature speed. (pound inches) | Remarks. | |---|---|---|---|---|---|---|---|---|---| | 25 | 5 , 0 | 50 | 226 | 7.48 | 20.0 | 20.4 | 101.9 | | | | 20 | 2 , 12 | 315 | 200 | 8.00 | 17.25 | 17.6 | 88.1 | | | | 15 | 2 , 14 | 700 | 160 | 8.80 | 12.125 | 12.5 | 62.5 | | | | 10 | 2 , 0 | 1130 | 124 | 9.52 | 8.0 | 8.40 | 41.9 | | | | 7 | 1 , 4 | 1410 | 104 | 9.92 | 5.75 | 6.12 | 30.6 | | | | 4 | 0 , 12 | 1875 | 77 | 10.46 | 3.25 | 3.62 | 18.1 | | | | 2 | 0 , 6 | 2350 | 60 | 10.80 | 1.625 | 2.00 | 10.0 | | | | 0 | 0 , 1 | 3200 | 39 | 11.22 | -0.0625 | 0.312 | 1.56 | | | X 7620 20.4.27. | ||