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).
Review of potential issues with a 1-inch longer dynamo, brush holders, a cutout, and fuses.
| Identifier | ExFiles\Box 36\4\ scan 227 | |
| Date | 1st July 1921 | |
| Contd. -2- RL/G1.7.21. have not seen any of the practical parts which are intended should replace the defective ones. I am not sure that the 1" longer dynamo has been run long enough to see whether it is thoroughly satisfactory. For instance, the extra length of armature may increase the vibrations through the deflection of the longer shaft, and so cause trouble to the windings or commutator. The brush holders, although nicely made, have a rigid arm to keep the carbon on the commutator, such a rigid arm is not in my opinion the best practice, and may account for the brushes not giving entire satisfaction. Regarding the cutout, I have only seen the experimental one, when I see the practical model suitable for fitting into the Lucas switchbox, I shall have a better chance of judging its reliability, but in addition to bearing the sparking due to the breaking the circuit, there is the trouble of corrosion of the contact that may take place. I mean such corrosion caused by the moist air near the sea. EFC. and Hs.{Lord Ernest Hives - Chair} should feel they are responsible that the cutout is thoroughly efficient and reliable. As regards the fuses, either these have only shown defective through the defective automatic switch, or no move whatever has yet been taken to reduce the risk of their failure. Contd. | ||