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).
Comparison of two servo designs ('40/50' and 'SS') with calculations for braking forces and efficiency.
| Identifier | ExFiles\Box 17\3\ Scan344 | |
| Date | 12th December 1928 guessed | |
| contd :- -2- possible to lock the front wheels with a 'kick' application of the pedal, whereas with gradual application the rear wheels would always skid first. It would therefore appear that for consistency and efficiency, the larger the radius at which these driving pins are fitted the better. Comparing the two servos - we have - 40/50. Friction disc radius 3.00 Cam radius .544 Cam angle 45° Assumed μ .1 For any pull 'Y' from the pedal, pull X = Y X 2.625/.544 X 3/1 X 5.8/2.05 X 2/7.85 = 1.06 'SS{S. Smith}' Friction disc radius 2.6" Cam radius .580. Cam angle 45° Assumed μ .1 For any pull 'Y' from the pedal, pull X = Y X 2/.580 X 2.6/1 X 5.5/2.05 X 2/8.5 = .565 It would therefore appear that disregarding the reduction in driving pin radius, the contd :- | ||