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).
Test data sheet recording observations from a starter motor brake test.
| Identifier | ExFiles\Box 64\1\ scan0276 | |
| Date | 27th July 1928 | |
| STARTER MOTOR TESTS. G2. G.2 FORM I. BRAKE TEST. (OBSERVATIONS). Date:- 27-VII-28 Motor under test:- Starter G2 Sequence Dia. of brake wheel:- 24" Weight of pan and portion of rope 5 lbs. 0 ozs. Reduction of epicyclic gear ratio:- 3.097 : 1 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. 35 | 6 8 | 15 | 256 | 6.88 | 28.5 | 33.5 | 402 | 129.8 30 | 2 8 | 70 | 248 | 7.04 | 27.5 | 32.5 | 390 | 125.9 25 | 2 0 | 225 | 220 | 7.60 | 23.0 | 28.0 | 336 | 108.4 20 | 2 0 | 475 | 192 | 8.16 | 18.0 | 23.0 | 276 | 89.10 15 | 2 0 | 690 | 164 | 8.72 | 13.0 | 18.0 | 216 | 69.70 12 | 1 6 | 835 | 148 | 9.04 | 10.625 | 15.625 | 187.5 | 60.50 10 | 1 5 | 935 | 134 | 9.32 | 8.69 | 13.69 | 164.1 | 53.00 8 | 1 0 | 1055 | 123 | 9.54 | 7.0 | 12.0 | 144 | 46.50 20.4.27. Brush position 2° advanced. | ||