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 starter motor brake test results, showing smoothed and derived data.
| Identifier | ExFiles\Box 64\1\ scan0304 | |
| Date | 21th April 1927 | |
| STARTER MOTOR TESTS. FORM 2. BRAKE TEST. SMOOTHED AND DERIVED RESULTS. | 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 | .311 | — | — | | 30 | — | — | 11.40 | .458 | — | — | | 40 | 2.0 | 3110 | 11.20 | .601 | .0986 | .164 | | 50 | 6.0 | 2660 | 11.00 | .737 | .253 | .343 | | 60 | 10.2 | 2330 | 10.80 | .869 | .377 | .434 | | 80 | 19.5 | 1810 | 10.40 | 1.114 | .560 | .503 | | 100 | 28.5 | 1460 | 10.00 | 1.340 | .660 | .492 | | 120 | 39.2 | 1180 | 9.6 | 1.543 | .734 | .478 | | 140 | 51.0 | 940 | 9.2 | 1.726 | .761 | .441 | | 160 | 63.0 | 700 | 8.8 | 1.886 | .700 | .371 | | 180 | 75.0 | 505 | 8.4 | 2.026 | .601 | .296 | | 200 | 86.8 | 310 | 8.0 | 2.144 | .427 | .199 | | 220 | 99.0 | 110 | 7.6 | 2.240 | .173 | .0773 | | 240 | — | — | 7.2 | 2.314 | — | — | 21.4.27. | ||