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).
Vibration complaints on the 40/50 chassis, concerning open versus closed cars and changes to compression and axle ratios.
| Identifier | ExFiles\Box 49\2\ Scan103 | |
| Date | 22th July 1922 | |
| To BJ. from Hs.{Lord Ernest Hives - Chair} c. to R.{Sir Henry Royce} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to BY c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to PN.{Mr Northey} c. to Br.{T. E. Bellringer - Repair Manager} X634 X4299 Hs{Lord Ernest Hives - Chair}1/LG22.7.22. COMPLAINTS OF VIBRATION FROM 40/50 CHASSIS. X.4299. X.196 X.634 BJ13/H20.7.22. The reason we say we shall expect to receive complaints on closed cars is that it is accepted by everybody that a closed car is worse than the open car as regards bringing out vibrations, therefore, if it is necessary to reduce the compressions of the open car in order to arrive at a certain standard of vibration, it is logical that the covered car should be reduced to something lower in order to give the same relative standard of vibration. In adopting one compression for both open and closed cars, we are departing from a policy which we have successfully used since 1911. It means that we shall no longer make the London to Edinburgh or the Austrian Eagle models because the compression which is to be adopted is the same as was used on the pre-war cars (low compression). Axle ratios. X.4299. It should be realised that as we lower the gear ratio so we increase the noise from the engine and car. There is no way of avoiding it. It is only necessary to run the car standing to notice that as the engine speed increases so noises from all parts increase. Also we as we increase the acceleration and deceleration by fitting the lower geared axles, so we do away with some of the smoothness of the pick-up which (contd) | ||