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 observations for a starter motor.
| Identifier | ExFiles\Box 64\1\ scan0277 | |
| Date | 27th July 1928 | |
| STARTER MOTOR TESTS. G.2 FORM 1. BRAKE TEST. (OBSERVATIONS). Sequence Date:- 27-VII-28 Motor under test:- Starter G.2. Dia. of brake wheel:- 24" Weight of pan and portion of rope 5 lbs. 0 ozs. and 0" 6" Reduction of epicyclic gear ratio:- 3.097 Load in pan (W) (lbs). Spring balance reading (S) lbs. ozs. Motor armature speed R.P.M. Amperes (C) Terml. volts. (E) W-S (lbs) T-t (lbs) Brake Torque (lb. ins) Equivalent torque at motor armature speed. (pound inches) (Tr{Capt. F. W. Turner - Finance}) Remarks. 6 | 1 0 | 1170 | 110 | 9.80 | 5.0 | 10.0 | 120 | 38.75 4 | 0 14 | 1325 | 96 | 10.08 | 3.125 | 8.125 | 97.5 | 31.50 2 | 0 11 | 1480 | 84 | 10.32 | 1.31 | 6.31 | 75.7 | 24.45 0 | 0 8 | 1645 | 71 | 10.58 | -0.5 | 4.5 | 54.0 | 17.44 3 | 0 5 | 1830 | 60 | 10.80 | 2.69 | 3.065 | 36.8 | 11.88 | 6 oz pan and rope 2 | 0 4 | 1960 | 52 | 10.96 | 1.75 | 2.125 | 25.5 | 8.32 | " 0 | 0 1 | 2340 | 36 | 11.28 | -0.0625 | 3.125 | 3.75 | 1.21 | " 0 | 0 0 | 2440 | 33 | 11.34 | 0 | 0 | 0 | 0 | Light. 20.4.27. | ||