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 performance of a clutch with metallic facings under various conditions, including heat and oil tests.
| Identifier | ExFiles\Box 129\4\ scan0010 | |
| Date | 9th October 1937 | |
| 2. No difference in the behaviour was observed, and the engagement remained smooth, silent and entirely free from slip in spite of the high temperatures, the tendency to jagger had increased slightly, but at no time was it at all bad. The clutch was then dismantled for examination, and found to be in remarkably good condition, the faces being smooth, and wear of both plate and facings hardly measureable, and the plate was not distorted, owing to the heat being carried away by the metallic facings. The treatment given would have distorted the plate with standard RAD.11 facings. In order to test capacity of this facing for working when oily, engine oil was injected on to the plate from an oil can. When cold some slip was observed, but on getting the clutch very hot by deliberate slipping, the slipping became very bad until it was allowed to cool down, after which the action gradually became normal, and subsequent heating, by rough handling, failed to produce further slipping, so that it is no worse when oily than the standard clutch, and the slipping remedy can be employed without damaging the driven plate, although this plate is susceptible to damage with the standard facings. Later in the same day I again tested car, and found it entirely free from slip whether hot or cool. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||