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).
Concepts of 'out-of-truth' and 'out-of-balance' in tyres and their effects.
| Identifier | ExFiles\Box 4\3\ 03-page48 | |
| Date | 9th October 1925 | |
| X401 c. Hs.{Lord Ernest Hives - Chair} c. BJ. BY11/H.{Arthur M. Hanbury - Head Complaints} 9.10.25. "OUT-OF-TRUTH" OF TYRES. -------------------- Referring to EP{G. Eric Platford - Chief Quality Engineer}8/H.{Arthur M. Hanbury - Head Complaints} 7.10.25. I am definitely of the opinion that you are reading into BJ19/H.{Arthur M. Hanbury - Head Complaints} 30.9.25. more than was intended. I believe that when he used the expression quoted above, BJ. actually had in his mind the "out-of-balance" effects. In our memo BY19/H.{Arthur M. Hanbury - Head Complaints} 1.10.25. we dealt with this with the "out-of-balance" aspect of the case which was not resorted to as a subterfuge, but was our interpretation of BJ's memo. In regard to the question of out-of-truth, looked at as meaning dimensional errors, it is quite impossible at this stage to ask the Dunlop Company to produce anything more accurate than they are at present producing. As a matter of fact the Dunlop tyre as produced and supplied to us is remarkably accurate, and whilst we agree certain dimensional errors do occur, we are quite certain of the following:- 1. Their amount is small. 2. We have no remedy for it. 3. A customer buying a tyre in the ordinary course of events will be unable to either correct or detect defects of this kind. We have apparently discussed wobbles until we have arrived at the position when we think of them by day and dream of them by night, whereas as a matter of fact, even with out-of-balance weights on a wheel, it is frequently quite difficult to obtain what you are looking for. This being the case, where marked out-of-balance effects are concerned, one is quite certain that any dimensional effects spoken of as 'out-of-truth' will not make themselves apparent except under the most extreme and rarest conditions, and even then one is inclined to think that the possibility of them building up to a dangerous extent on the road from a first cause of dimensional effects alone is non-existent. Contd. | ||