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).
Brake shoe arrangements and the implementation of four-wheel brakes.
| Identifier | ExFiles\Box 73\2\ scan0160 | |
| Date | 20th December 1923 guessed | |
| contd:- -2- shoe as a means of safely using a long shoe on the brake drums, and a means of obtaining effective braking with a given lever-age. Our own particular type of arrangement so as to use a lapping jointed shoe backwards, and making the rear shoes longer than the forward shoes, gives us by direct pressure from the foot pedal a fair amount of rear braking. It will be noticed that we are not in favour of the long self servoing jointed shoe suggested by Perrot, the first reason being that such brakes could not be passably effective backwards, and moreover to divide the foot press-ure between four brakes would leave insufficient braking energy when adequate pull off springs are used to overcome the inevitable friction due to rusty brake shafts, so that I cannot see how there is much hope for working four wheel brakes at least on a heavy car like ours without a servo relay. At this joint I am pleased to say we appear to be getting to understand more of the braking problem generally, and have made fairly rapid progress on the altered conditions caused by the introduction of four wheel brakes. The temporary arrangement as fitted to the existing 40/50 (EAC.111.) though having undesirable features, appears to be capable of being made to give satisfaction. It is desirable however to change to the EAC.11. as soon as every possible. see original for sketch. R.{Sir Henry Royce} | ||