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).
Adjustments to damper valve springs and the effect on vehicle riding and handling.
| Identifier | ExFiles\Box 101\2\ scan0127 | |
| Date | 23th October 1936 | |
| To GWH{George W. Hancock - Head Chateauroux}/I.M.Waller, Hotel de France, Chateauroux, Indre, France. Rm{William Robotham - Chief Engineer}/Les.17/JH. 23.10.36. 22-G-V.{VIENNA} Low Rating Springs and Roll Rod. We are interested in your note on the above reference GWH{George W. Hancock - Head Chateauroux}/IMW{Ivan M. Waller - Head of Chateauroux}/3/JAB.16.10.36. It appears that the reduction of .015" in set up of the damper valve spring will only affect the initial damper loads if the control system is connected. That is, one would not expect any change in the car about 40 M.P.H. In considering riding it is really necessary to distinguish for each test, pitching, harshness, control and braking etc. More rear damping than really desired is often needed due to violent braking causing the axle to dither off the road. A general outlook that a lower rating spring needs less damping seems reasonably owing to the increased axle movement absorbing more energy for the same load. We note you like the front roll rod, and are going to have a duplicate set of parts fitted to a car so that your tests can be repeated. Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} | ||