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).
Technical and cost implications of using narrower brushes for the EAC.7 starter motor.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 86 | |
| Date | 5th January 1927 | |
| To AJS. from EFC. EFC4/T5.1.27. ORIGINAL X7625 EAC.7 STARTER MOTOR. Answering your AJS/M24.12.26. I understand the main object of the suggestion is to enable similar brush holder parts to be used, thus resulting in saving. From a purely technical point of view there may be a very slight advantage in the narrower brushes in the efficiency of the motor, otherwise there is practically nothing in it. Therefore, it is a question as to whether the slight lengthening of the motor would cut out any saving gained by having the brushes the same. EFC. | ||