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).
Clutch disc friction testing and its relation to transmission rattle on chassis B.20.AW.
| Identifier | ExFiles\Box 130\3\ scan0163 | |
| Date | 24th January 1941 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/GB. Copy to Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} [Handwritten in red] 1110 Rm{William Robotham - Chief Engineer}/GB.1/ET.24.1.41. The 10" clutch disc from the demonstration car (chassis B.20.AW) has been checked for friction. The depth of the loop was 17 lb.ft to 27 lb.ft. (See attached graph). The above car is free from transmission rattle. With the experience gained on Lp.{Mr Lappin}'s car, we can now say that 1. Rattle occurs with 10 lb.ft. friction. 2. " does not occur with 17 to 27 lb.ft. of friction. Rm{William Robotham - Chief Engineer}/GB. | ||