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).
Graph of performance curves for an experimental starter motor, showing efficiency, voltage, BHP, amperes, and torque against speed.
| Identifier | WestWitteringFiles\G\June1921\ Scan59 | |
| Date | 20th December 1930 | |
| STARTER MOTOR BRAKE EFFICIENCY. X.3082 R.R. EXPL. MOTOR X.3009. CURVE LABELS: EFFICIENCY., VOLTS., B.H.P., AMPERES, TORQUE. X-AXIS: SPEED (R.P.M.) 0, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000. Y-AXES (from bottom to top): EFFICIENCY: 0, .1, .2, .3, .4, .5, .6, .7, .8, .9, 1.0 VOLTAGE: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 AMPERES: 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250 HORSE POWER: 0, .2, .4, .6, .8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0 TORQUE (POUND INCHES): 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 STAMP: ROLLS-ROYCE, LIMITED, PRINT ROOM., 20 DEC '30 | ||