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).
Analysis of 'Radiator Shiver' vibration on 20 HP and 'SS' models.
| Identifier | ExFiles\Box 15\1\ Scan071 | |
| Date | 17th December 1928 | |
| Bs.{A J. Barnes - Assistant Manager} DA.{Bernard Day - Chassis Design} FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} +7250 R2/M17.12.28. X.7005 X.7380 X.5005 X.7250 20 HP. AND 'SS{S. Smith}'. RADIATOR SHIVER. (1) The axle with wheels and springs complete has a definite period on the road. (2) The front end of the frame with radiator etc., without axle, also has a definite period, which may be near the axle (1), this is without the engine. (3) If we add the engine to the frame the period becomes very slow and does not match the axle, and this may make a great improvement. To do this we must have rigid front feet so that the frame cannot move without the engine. So that it is the rubber mounting more than the cross in the frame. This is partly proved by tightening the front engine dampers. The pick-up vibrations will be affected, also we hope for the better - i.e. at a very slow speed, and not much felt in the body. Without the front dampers, and without the engine, high speed wobbles would be at the same speed, and much worse. If the two items - i.e. axle and frame, without engine, are nearly alike a small connection of even flexibility, namely, road springs or light shock dampers, would transmit sufficiently to make the radiator synchornise with the axle. R.{Sir Henry Royce} | ||