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).
Query regarding the effects of fitting 14-tooth axles to Phantom cars and a request for previous test data.
| Identifier | ExFiles\Box 66\4\ scan0346 | |
| Date | 25th June 1926 | |
| c. to Wov Please return to HsRG. X8350 PN{Mr Northey}14/DN25.6.26. TO Hs{Lord Ernest Hives - Chair} c. to BJ FROM PN{Mr Northey} We have frequently given consideration as to whether 14-tooth axles fitted to Phantoms may conceivably be a better combination than the gear-ratio now fitted as standard, and this becomes a more important consideration in view of R.{Sir Henry Royce} having approved the 14-tooth pinion for the American production. We remember that sometime back tests were made in connection with the Silver Ghost with axles having both 14 teeth and higher gear-ratios. We would like to have a copy of these tests if you can put your hand on them. I think we ought to be in a position to have as far as possible any information which would result from fitting a lower-geared ratio. For instance, do we know:- (a) What is the likely increase of consumption with 1. Open bodies. 2. Closed bodies. (b) The likely difference in wear and tear, maintenance &c. (c) The likely difference in engine fuss or development of any periodic sound or vibration. (d) The effect on maximum road speed. Wor.{Arthur Wormald - General Works Manager} { I understand that the Works have always found more difficulty in the production of 14-tooth axles than in the case of the higher gear-ratio pinions, from the point of view of sound. Has this been got over now? We should like to have any available information on these points as soon as possible, because otherwise we cannot form any just opinion as to the likely effect upon our owners of Rolls-Royce cars in the future. P.N. DN. | ||