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).
Spring eye movement during braking and road tests, with plans for fitting a new flexible shackle.
| Identifier | ExFiles\Box 182\M19\ img222 | |
| Date | 31th August 1931 | |
| Hs{Lord Ernest Hives - Chair}/Lid{A. J. Lidsey}3/AD31.8.31 contd. -4- of the spring eye is always greater than forward movement, the difference being about 33% under main road conditions but becoming more equal on very bad potholed roads. We give the maximum backward and forward movement in the results of these tests, under various conditions including the extremes which are only occasionally encountered. The most important point to be mentioned is that the movement necessary to cope with joggles is small enough not to interfere with the steering when the brakes are applied. The braking on 20-EX was not very good when these tests were carried out and the hardest braking possible did not affect the steering in the slightest. The maximum movement of the spring eye under these conditions is .156". The maximum movement recorded on a bad joggling road is .113" (at 60 M.P.H.). It will be safe, therefore, to limit the movement of the spring eye to .150" - this will cope with all joggling and will not be sufficient to upset the steering when the brakes are applied. We have made up a W.W. type of flexible shackle for fitting to 25-EX and in addition are preparing a second one for a R.H. car. As soon as 25-EX is available this will be fitted and tests carried out to ascertain its useful-ness in conjunction with diamond engine mounting. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} | ||