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).
Torque test report for a motor armature at crawling speed.
| Identifier | ExFiles\Box 64\1\ scan0230 | |
| Date | 8th July 1926 | |
| MOTOR FORM 3. TORQUE TEST OF MOTOR armature (at given speeds) Date :- 8-7-26 Motor under test :- E.A.C. G.2 Speed:- Crawling (Teazer) No:- Epicyclic Reduction gear ratio :- 96 to 31 Dia: of brake wheel :- 24" Weight of pan and portion of rope:- 0 lbs. 2 ozs. TABLE DATA Load in pan (lbs) (W). | Spring balance reading (S) lbs, ozs | Amperes. | Field volts. | Arm. volts. | Total volts. | Field ohms. | Arm. ohms. | Total ohms. | W-S (lbs) | T-t (lbs) | Brake Torque (lb-inches). 4.5 | 2 0 | 34.0 | 15.30 | 27 | 15.57 | .450 | - | - | 2.50 | 2.625 | 31.5 4.0 | 1 9.5 | 30.0 | 13.45 | 26 | 13.71 | .448 | - | - | 2.41 | 2.535 | 30.4 3.5 | 1 8 | 27.0 | 12.80 | 23 | 13.03 | .474 | - | - | 2.00 | 2.125 | 25.5 3.0 | 1 7 | 25.0 | 11.20 | 22 | 11.42 | .448 | - | - | 1.56 | 1.685 | 20.2 2.5 | 1 4.5 | 22.0 | 10.20 | 21 | 10.41 | .464 | - | - | 1.22 | 1.345 | 16.1 2.0 | 1 0 | 21.0 | 9.35 | 19 | 9.54 | .445 | - | - | 1.00 | 1.125 | 13.5 1.5 | 0 12 | 17.5 | 8.0 | 17 | 8.17 | .457 | - | - | .75 | .875 | 10.5 21.9.25. | ||