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).
Performance graph showing the brake efficiency curves for a Lucas starter motor.
| Identifier | ExFiles\Box 51\5\ Scan078 | |
| Date | 3rd January 1922 guessed | |
| STARTER MOTOR BRAKE EFFICIENCY X4342L LUCAS STARTER MOTOR AMPERES. EFFICIENCY VOLTAGE SPEED R.P.M. HORSE POWER TORQUE (POUND INCHES) Graph curves: B.H.P, VOLTS, EFFICIENCY, SPEED, TORQUE Y-Axis (Amperes): 0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240 X-Axis (Efficiency): 0, .1, .2, .3, .4, .5, .6, .7, .8, .9, 1.0 X-Axis (Voltage): 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 X-Axis (Speed R.P.M.): 0, 300, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000 X-Axis (Horse Power): 0, .2, .4, .6, .8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0 X-Axis (Torque (Pound Inches)): 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 | ||