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 34\3\ Scan173 | |
| Date | 21th April 1927 | |
| STARTER MOTOR TESTS. FORM 2. BRAKE TEST. SMOOTHED AND DERIVED RESULTS. 45a Ampere ref. (C) Equivalent Torque (lb-inches) (T) Speed (R.P.M.) (N). Volts. (E) E.H.P. B.H.P. Efficiency. 20 | .5 | 3150 | 11.55 | .310 | .180 | .445 (crossed out) .394 30 | 3.6 | - | 11.37 | .457 | - | .535 40 | 8.0 | 2530 | 11.20 | .600 | .321 | - 50 | 12.9 | 2080 | 11.00 | .7375 | .3575 / .425 | .483 / .577 60 | 18.4 | 1815 | 10.85 | .872 | .530 | .6075 80 | 30.6 | 1440 | 10.50 | 1.126 | .699 | .571 / .620 100 | 45.2 | 1140 | 10.20 | 1.368 | .782 | .571 120 | 57.1 | 880 | 9.90 | 1.593 | .797 | .500 140 | 71.0 | 700 | 9.65 | 1.810 | .788 | .435 160 | 85.0 | 540 | 9.50 | 2.038 | .728 | .357 180 | 99.0 | 410 | 9.38 | 2.265 | .644 | .284 200 220 240 21.4.27. Smoothed from See brake test figures dated 5.3.18. | ||