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 behavior of a fibre block and contact gap at different engine speeds, with diagrams.
| Identifier | ExFiles\Box 36\1\ scan 114 | |
| Date | 30th June 1917 guessed | |
| Contd. (3) At 2800 R.P.M. however, they did not close until position 2, at 3400 R.P.M. at positions 3 and at 4000 R.P.M. and all higher speeds up to 6000 R.P.M. at position 4. At 4000 to 6000 R.P.M. the "fling" was such that the gap opened to .060" i.e. as far as the stop would allow it, and then gradually closed again. (The dead slow gap was about .030"). The actual path of the fibre block at these speeds in passing over the cam was as indicated in sketch below, Contd. | ||