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).
Extract from a Westinghouse document comparing their starter motor to a Rolls-Royce Lucas motor.
| Identifier | ExFiles\Box 23\2\ Scan090 | |
| Date | 11th April 1921 | |
| X.1086 11-4-21 X.1086 - EXTRACT RE WESTINGHOUSE STARTER MOTOR FROM WESTINGHOUSE DESCRIPTION OF THEIR STARTING & LIGHTING EQUIPMENT FOR ROLLS-ROYCE. 10. PERFORMANCE. The 56 CG starting motor is designed to start the Rolls-Royce engine under all temperature conditions, when used with a suitable battery. The maximum efficiency is 68% and is obtained at approximately 100 R.P.M. cranking speed of the engine. The machine is so designed that high efficiency is obtained at the higher torque values, where it is most needed, as the higher torque and the higher current values are obtained under cold weather conditions. Also, the motor is designed for higher cranking speeds, and in operation the total watts seconds taken from the battery, will be less than that of the Rolls-Royce motor now used, as the Westinghouse motor will take more current for less time, and quicker starting of the engine will result. This is particularly true at the higher current and torque values, where the efficiency obtained on the Westinghouse motor, shows up to good effect. The 56 CG motor is designed to give higher efficiency and higher speed than the Rolls-Royce starting motor, throughout the normal operating range. Referring to curve 102168, the higher efficiencies obtained on the 56 CG motor at the higher current and torque values, where high efficiency is needed in cold weather, is readily apparent. The maximum horsepower of our motor is 1.7, and it will be noted that this horse power occurs at the higher torque values, where it is needed in cold weather; while the maximum horse power of the Rolls-Royce motor, 1.35, occurs at lower current value and drops off for the higher torques where it is really needed. Complete performance of the Rolls-Royce and Westinghouse motors are shown on the following curves: ROLLS-ROYCE LUCAS MOTOR 102168 102170 WESTINGHOUSE 56 CG MOTOR 102167. 102168. 2. STARTING MOTORS: Partial comparison of the two motors has already been given above. The main advantages of the Westinghouse CG motor over the Rolls-Royce Lucas motor, are performance and weight. The Westinghouse motor is so designed as to give higher efficiency and greater horse power at the higher current and torque values where these are most needed. This Contd. | ||