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).
Specifications, dimensions, and stress tolerances for front springs.
| Identifier | ExFiles\Box 72\3\ scan0129 | |
| Date | 16th September 1924 | |
| 49410 Da{Bernard Day - Chassis Design} / C. Hs.{Lord Ernest Hives - Chair} BY18/H.{Arthur M. Hanbury - Head Complaints} 16.9.24. FRONT SPRINGS. Referring to Da{Bernard Day - Chassis Design}2/M.{Mr Moon / Mr Moore} 15.9.24. the permissible range or tolerance referred to in your last paragraph as shown on our drawing is .285 to .300, this being the size of plate and tolerance allowed on the old type front spring before we adopted front brakes. On the new spring drawings which we have just completed, the dimension given is .3125 and a minimum allowance of .300 In regard to the question of stress range, we are aware that there is a wider stress range in the top plate although the maximum stress reached is less, but springs which we have tried in which the top plate has followed the curvature of the other plates, did not show any marked difference so far as their life is concerned, over the standard scheme which we have worked to for some time. This is the point which I referred to at West WitteringHenry Royce's home town, although apparently I did not make it clear. It would appear that the increased range of stress with the lesser maximum stress appears to give a very similar effect to the lessened range with a higher limit which occurs when the top plate follows more closely the curvature of the bottom plate. BY.{R.W. Bailey - Chief Engineer} Ry | ||