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).
Report proposing to standardise Cotton 'A' fabrics for torque reaction dampers on 20/25 HP cars.
| Identifier | ExFiles\Box 137\4\ scan0118 | |
| Date | 21th November 1934 | |
| -2- Hs{Lord Ernest Hives - Chair}/AL.1/AL.21.11.34.Contd. best load being 8 lbs. measured at the end of the long arm. The effect of soaking in oil is to provide a more constant slipping load. When setting the load on dampers it is necessary to reproduce as nearly as possible the conditions existing when in position on the engine. A distance piece 'A' equal in thickness to the lug on the crankcase should be used and the two arms bolted up to it, the bolt 'B' must also be tight. The existing spring and centre bolt give the correct loading. The Cotton 'A' fabrics are the same thickness as used on servos and should not be any more costly than Ferodo. With this load of 8 lbs. torque reaction vibrations are not more prominent than with the present standard Ferodo friction surface. Apart from damping out the 48 to 56 M.P.H. period (top gear) the remaining engine boom periods appear to be less, particularly on retard. We propose to standardise Cotton 'A' fabrics for torque reaction dampers and are running them 10,000 miles on 18-G4. This applies only to 20/25 HP. cars with diabolo rubber rear engine mounting. Hs{Lord Ernest Hives - Chair}/AJL. | ||