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 efficiency curve of a starter motor.
| Identifier | ExFiles\Box 51\5\ Scan131 | |
| Date | 23th March 1921 guessed | |
| STARTER MOTOR. CURVE OF EFFICIENCY Y-Axis Labels: EFFICIENCY % VOLTAGE AMPERES B.H.P. R.P.M. Y-Axis Scales: EFFICIENCY %: 0, .4, .8, 1.2, 1.6, 2.0, 2.4, 2.8, 3.2, 3.6, 4.0 VOLTAGE: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 AMPERES: 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250 B.H.P.: 0, .2, .4, .6, .8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0 R.P.M.: 0, 300, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700 X-Axis Label: TORQUE (LBS) X-Axis Scale: 10, 20 Text on graph plot: VOLTS AMPS B.H.P R.P.M. | ||