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 system performance, covering servo lining friction, heat dissipation, and brake drum materials.
| Identifier | ExFiles\Box 105\4\ scan0076 | |
| Date | 5th September 1930 | |
| -2- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/MJ.5.9.30.Contd. constant value for this swinging arm friction and for this reason we are trying a Ferodo lining on the swinging arm bearing. Though there is no doubt that the variation in the coefficient of friction in the servo lining is the main cause of inefficient servos the ball bearing face cams as used in America appear to be one means of reducing a variable to the minimum. We gave Ds. some parts made in the States when he was last up at Derby. There is one other feature in connection with the brakes which interests us at the moment and that is, their capacity for heat dissipation. Our clutch experiments have shown us that cast iron is such excellent material working against Ferodo that the possibility of using R.R. forged alloy drums shrunk on to cast iron liners becomes rather attractive. Actually the only trouble we get from absence of heat dissipation is the considerable increase in pedal travel which occurs when the brakes are used violently. Since it is possible, however, to make the front brake liners smoke by sudden stops from high speeds we think that we may increase our tendency to scored brake drums due to the high temperature attained. It is a fact, however, that apart from squeaks thebraking system is one of the features on the car which gives the least trouble. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||