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).
Low-speed vibrations related to rear engine suspension and a proposal for testing.
| Identifier | ExFiles\Box 14\5\ Scan013 | |
| Date | 4th April 1928 | |
| S/W. Hs.{Lord Ernest Hives - Chair} Copy to:- EP.{G. Eric Platford - Chief Quality Engineer} x7005 CWB3/GM/4.4.28. Re: 81-RF. With further reference to my CWB3/GM/3.4.28 and with reference to your standardisation sheet - X No. 7005 REAR ENGINE SUSPENSION. Whilst it is thoroughly realised that the rubber and spring rear suspension of the engine eliminates high speed engine vibrations it is not clear whether its effect on the low speed torque re-action vibrations is ~~not~~ equally clear. In 15-EX vibrations were unnoticeable above 30 m.p.h. but in the region of 20 the pick up vibrations were, it is considered, rather more noticeable than on standard car. From the Sales point of view it is considered that these pick up vibrations are of much greater importance than the high speed vibrations and if you have any definite experience on the effect of this mounting in this regard would you kindly let me know. It is felt that the best method of deciding this point would be to take a car which we know well and 81-RF in which these vibrations are somewhat marked, ~~is~~ suggested, and to fit this mounting to this car and make a test, making no other alterations, when the matter could be at once decided. Could you arrange to do this immediately after Easter when the car could be spared for say 3 days, which it is assumed would be long enough to effect the alteration? In order to save time the test could be made at W. CWB. | ||