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 characteristic graph for an ED-180 laminated pole motor, plotting various metrics against torque.
| Identifier | ExFiles\Box 40\5\ Scan099 | |
| Date | 26th July 1920 | |
| Y-AXIS LABELS (LEFT): R.P.M., & B.H.P., MOTOR VOLTS, % EFFICIENCY Y-AXIS LABELS (RIGHT): AMPERES X-AXIS LABEL: TORQUE IN FT. LBS. CURVE LABELS: EFFICIENCY, MOTOR VOLTS, B.H.P, AMPERES, R.P.M. DATA BLOCK: ED{J. L. Edwards}-180 - LAM. POLE CARD 347 7-26-20 DA{Bernard Day - Chassis Design} - 4 1/8 L - 3 1/4 G - 28 205x325 S.35 75.5 / 145.5 T = 210 F = 30 A = .65 B = .45 2PT-30-212 / 212 LAM. R AT S 2 3/16 43.1% SHEET M-373 RM{William Robotham - Chief Engineer} | ||