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 jagger issues caused by flexible engine mountings and the testing of a new clutch.
| Identifier | ExFiles\Box 103\1\ scan0092 | |
| Date | 23th May 1934 | |
| -2- Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}B/KW.23.5.34. During our experiments with flexible engine mountings we have run into clutch jagger because of the engine movement affecting the geometry of the clutch operation. This has been very noticeable on 20-G-IV. Even with cantilever pedals, when the engine was allowed a fore and aft movement of .125, the clutch was impossible. When this movement was restrained as the engine was still flexibly mounted about its rolling axis, clutch jaggers could be obtained, the effect on the apparent length of the horizontal adjusting link, of engine rotation, being sufficient to cause jaggering. On the second car so fitted up, Mor's new one, we have not so far had clutch trouble, though the pedal and engine mounting is substantially similar to 20-G-IV, however 20-G-IV has greater freedom of movement. For both the 20/25 and Bentley we think the new clutch may reduce our troubles after arrangement of the operating mechanism to be unaffected by engine movement. We are fitting one of these clutches to a Bentley as soon as possible. Regarding the 20/25, the new clutch is at present running 10,000 miles on 21-G-IV. Rm{William Robotham - Chief Engineer}/H.Grylls. | ||