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).
Specification of chassis springs for cars intended for Australia.
| Identifier | ExFiles\Box 67a\2\ scan0014 | |
| Date | 27th June 1927 | |
| RECEIVED JUN 28 1927 Hs{Lord Ernest Hives - Chair} Per R.BJ. C.Hs.{Lord Ernest Hives - Chair} X-8410 BY14/H.{Arthur M. Hanbury - Head Complaints} 27.6.27. CHASSIS - SPRING FOR AUSTRALIA. ---------------------------- Referring to R4/M.24.6.27. it occurs to me that I did not make clear the fact that when comparing one set of springs with another, we always use the springs which would be fitted to a car for use in England, as a standard. The foregoing being the case, my memo was intended to convey the idea that we were suggesting replacing the use of springs 20% stiffer than those used in England, with the reduced clearance which goes with same in order to keep the direct stresses imposed upon the plates the same, with springs 15% stronger than those used in England, and maintain the depth of buffer used for English springing. This would result in an increased buffer clearance under normal load, and would maintain, with maximum load, the clearance as you suggest, which would, under standard english conditions, exist between the axle and the buffer under normal load. Our proposal included the use of standard buffers, as Ft. was particularly insistent that a lot of his troubles were due to the chassis coming down on to the buffers and thereby causing complaint, and in the case of the front engine supports, failure. In regard to your last paragraph, we note that Oy. is not of the opinion that grading of the plates results in the regular stress along the plates. We were of the opinion that from this point of view the springs were correct, as it was one of the main issues we had got in front of us when discussing the design of springs originally with Messrs Firths' spring expert (Mr.Stansfield). I will, however, take the matter up again with Mr.Stansfield and if there is any question about this particular point, will stick to the issue until I am satisfied that regular stresses do occur from end to end of the plate. BY.{R.W. Bailey - Chief Engineer} By | ||