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\ scan0272 | |
| Date | 21th April 1927 | |
| STARTER MOTOR TESTS. FORM 2. BRAKE TEST. SMOOTHED AND DERIVED RESULTS. C2 2s 2f Amperes. (C) Equivalent Armature Torque. (lb-inches) (T) Speed (R.P.M.) (N). Volts. (E) E.H.P. B.H.P. Efficiency. (η) 20 11.60 30 11.40 40 11.20 50 3.0 3400 11.00 .737 .162 .220 60 5.0 3150 10.80 .869 .250 .288 80 10.2 2740 10.40 1.115 .444 .398 100 16.8 2360 10.00 1.340 .629 .470 120 23.5 2040 9.6 1.542 .762 .493 140 30.9 1780 9.2 1.728 .873 .505 160 38.1 1570 8.8 1.888 .950 .503 180 45.0 1385 8.4 2.025 .989 .488 200 52.0 1200 8.0 2.145 .990 .462 220 59.5 1025 7.6 2.240 .968 .432 240 67.1 845 7.2 2.315 .900 .388 21.4.27. | ||