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).
Suggestions to reduce sponginess and increase stiffness in the EAC.7 brakes.
| Identifier | ExFiles\Box 66\5\ scan0110 | |
| Date | 25th March 1927 | |
| To BY. {R.W. Bailey - Chief Engineer} Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} from DA. {Bernard Day - Chassis Design} c. to BJ. 78420 DA {Bernard Day - Chassis Design} 8/M25.3.27. EAC.7. BRAKES. X.7420 X.8420 We have gone into the question of reducing the sponginess on the EAC.7. brakes, and send herewith N.schs. 2384/5 shewing some suggestions which have been submitted to R. {Sir Henry Royce} We expect that he will give us an idea of the lines along which he would like us to work. On N.sch.2384 we suggest that the increased stiffness in the brake drum might be obtained by adding a flange on the outside, as is done on the 20 HP., in a less degree. The brake shafts are rather more flexible than those on the Phantom, the pedal movements being respectively about .446, and .205. In order to get anywhere near the Phantom rigidity from this cause we should have to increase the shafts to 1.150 as indicated on this drg. We think this could be put on to the existing brake gear with very little alteration. With reference to the lost pedal movement attributed to the spring wind up, on N.sch.2385 we have suggested that by modifying the levers, the eye of the foot brake lever could be brought level with the top plate of the spring, which would have the effect of greatly reducing this effect. Only the levers are altered, all other fittings remaining the same. We do not entirely agree with the statement that the direct braking is already a minimum, as it appears to be more than at present on the Phantom in spite of the smaller diameter drum. DA. {Bernard Day - Chassis Design} | ||