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).
Table of smoothed and derived results from a starter motor brake test.
| Identifier | ExFiles\Box 64\1\ scan0278 | |
| Date | 21th April 1927 | |
| G.2 STARTER MOTOR TESTS. FORM 2. BRAKE TEST. SMOOTHED AND DERIVED RESULTS. | Amperes. (C) | Equivalent armature Torque (Lb-Inches) (Tq) | Speed (R.P.M.) (M) | Volts. | E.H.P. | B.H.P. | Efficiency. (η) | |---|---|---|---|---|---|---| | 20 | – | – | 11.60 | .311 | – | – | | 30 | – | – | 11.40 | .458 | – | – | | 40 | 2.5 | 2240 | 11.20 | .601 | .0889 | .148 | | 50 | 7.0 | 2000 | 11.00 | .737 | .222 | .301 | | 60 | 11.7 | 1825 | 10.80 | .869 | .339 | .390 | | 80 | 22.0 | 1520 | 10.40 | 1.114 | .530 | .476 | | 100 | 33.7 | 1290 | 10.00 | 1.340 | .690 | .515 | | 120 | 45.6 | 1085 | 9.6 | 1.543 | .775 | .502 | | 140 | 56.7 | 900 | 9.2 | 1.726 | .810 | .469 | | 160 | 69.2 | 710 | 8.8 | 1.886 | .779 | .413 | | 180 | 82.2 | 530 | 8.4 | 2.026 | .691 | .341 | | 200 | 95.3 | 375 | 8.0 | 2.144 | .567 | .264 | | 220 | 108.5 | 240 | 7.6 | 2.240 | .413 | .184 | | 240 | 121.5 | 110 | 7.2 | 2.314 | .2125 | .0918 | 21.4.27. | ||