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).
Engine suspension rubbers, rear support vibrations, and a reversion to fabric engine couplings.
| Identifier | ExFiles\Box 15\4\ Scan037 | |
| Date | 21th June 1929 | |
| To OY. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} x7305 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG21.6.29. ENGINE SUSPENSION. x7005 (crossed out) x7380 With reference to your note of the 2nd. June with reference to engine suspension. The 5th. point at the rear of the gearbox provides a means of lining the engine up in the frame. We have found difficulty from the fact that the engine rubber, if loaded for a sufficient length of time, will take a permanent set. Where the engine weight is carried on rubbers therefore, the engine is inclined to settle down and throw the transmission out of line. The advantage of the support behind the gearbox is that it enables us to use considerably more flexible engine feet rubbers if we want to. We have done a great many tests running with and without this engine support to see if we could detect any difference in the amount of engine roughness which is transmitted to the body. So far however we cannot say that we think this rear support transmits engine vibrations to the body. We therefore are rather in favour of this support as a XXX means of giving us a wide latitude in the rear engine feet rubbers which we can use. ENGINE COUPLING. With reference to your note of June 12th. re. engine couplings. We have reverted to the fabric coupling on the S.S. At the same time we have recommenced a number of tests on fabric coupling life. contd :- | ||