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).
The effects of a damaged disc, noting fabric breakdown, transmission clatter, and clutch grabbing issues.
| Identifier | ExFiles\Box 74\3\ scan0067 | |
| Date | 31th January 1929 guessed | |
| - 2 - When the loading is increased suddenly however the fabric has been seen to run out very much more up to about .080 or .100. This occurs when the engine is running in high gear and the brake suddenly applied. We do not know yet whether it also occurs under steady low speed pulling. But a coupling with one sector damaged shows itself in this way and is easily detected when testing servos on test chassis. We therefore think that a disc showing damage in one compression sector, although it is in no danger of actual breakage, should be replaced. Other Effects Due to Damaged Disc. Furthermore we believe (although we have not full data) that a partial breakdown of the fabric is detected in the running of the car by signs of excessive flexibility in the drive, e.g.:- Clatter in the transmission when clutch is suddenly released at low speeds. Jagger in reversing. "Grabbing" when engaging clutch at low speeds. We should appreciate further comments from England when the bulged discs have been tested. OY. Maurice Olly | ||