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 brake efficiency, horsepower, voltage, amperage, and speed against torque for an experimental starter motor.
| Identifier | WestWitteringFiles\G\June1921\ Scan62 | |
| Date | 23th June 1921 | |
| STARTER MOTOR BRAKE EFFICIENCY. X.3082. R.R. EXPL. MOTOR X.3009. APPROX. WORKING POINT ON 40/50 CHASSIS. AXIS LABELS: ELECTRICAL H.P., EFFICIENCY, VOLTAGE, AMPERES, B.H.P., R.P.M., TORQUE (POUND INCHES.). CURVE LABELS: EFFICIENCY, VOLTS, E.H.P., B.H.P., AMPERES, SPEED. (ASSUMING EPICYCLIC GEAR ON MOTOR TO BE 100% EFFICIENT.). ROLLS-ROYCE, LIMITED PRINT ROOM. DERBY. | ||