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).
That the brush springs for the Goshawk motor and dynamo are too strong and proposing new tension limits for the manufacturer.
| Identifier | ExFiles\Box 50\5\ Scan130 | |
| Date | 1st September 1922 | |
| X4333 To By. {R.W. Bailey - Chief Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} c.c. To By {R.W. Bailey - Chief Engineer} /Ds. EPC2/T1.9.22. X.4069. RE BRUSH SPRINGS FOR GOSHAWKAero EngineCodename for 20HP Car / Aero Engine after KestrelAero Engine MOTOR X.4333. & DYNAMO. Recently we have noticed that the springs fitted to the dynamo and motor are rather too strong and on taking this up with Mr. Davis, he has got Mr. Goodall of the Inspection Dept. to measure the tension of a number of these taken at random, in the set up position. This has been found to be anything from 1 lb. 6 ozs. to 1 lb.10 ozs, whereas a tension of only 1 lb. is specified on the drawing. Mr. Goodall assures us that the original sample springs were correct. Therefore, it appears to us to be up to the makers to put this matter right. For the time being we must carry on with the stronger springs, though we consider the tension too great both for the motor and dynamo. Could you kindly take steps to have this matter rectified ? We suggest that limits should be given to the makers of 1 lb. +- 2 ozs, to which the spring should conform. EFC. {E. Fowler Clarke - Electrical Engineer} | ||