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).
The testing and results of 'SS' engine mountings to reduce vibration.
Identifier | ExFiles\Box 17\3\ Scan353 | |
Date | 8th January 1929 | |
To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c.c. to DA.{Bernard Day - Chassis Design} c.c. to Wor.{Arthur Wormald - General Works Manager} X7430 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/LG8.1.29. 'SS{S. Smith}' ENGINE MOUNTING. X7430 We have today wired you as follows :- "ELLIOTT - FOUR FEET ON STRIP RUBBER GIVE EXCELLENT "RESULTS STOP LARGER BALLS AND MORE FRICTION ON "CROSS STEERING TUBE REQUIRED AS SOON AS POSSIBLE" ROBOTHAM" The four engine feet having channels isolated from the frame channel with 1/8" hard strip rubber, seem to be an excellent compromise. The engine vibrations felt are of a very minor nature. Just how inconsiderable, we cannot tell until we have improved the exhaust system, as this produces various periods in a closed body. The radiator movement is almost entirely absent at all speeds. What small amount of radiator movement still remains will doubtless disappear if we had slightly more friction in the steering. The steering on all SS.{S. Smith} cars is remarkably light and we can undoubtedly stand quite a large increase percentage of friction. We do not know whether you will be able to increase the torsional rigidity of the frame by improving the member which supports the radiator, but if this was at all possible it might enable us to ask the engine feet to do a little less and so improve the smoothness of the car. contd :- | ||