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).
Difference of opinion on spring strength and frictional load for rear shock absorbers.
| Identifier | ExFiles\Box 78\2\ scan0378 | |
| Date | 10th May 1922 | |
| Hs{Lord Ernest Hives - Chair} MAY 10 1922 From BY.{R.W. Bailey - Chief Engineer} RECE V3461 BY1-P10.5.22. REAR SHOCK ABSORBERS. There is a difference in opinion as expressed by yourself and DA{Bernard Day - Chassis Design}, as to the strength of the springs applying the frictional load. DA{Bernard Day - Chassis Design}, on his latest design asks us to fit 24 lb springs. He bases this on a co-efficient of friction of .100, but previously you had asked us to reduce the springs to 14 lbs, and then stated that you were unable to get 60 lbs on the end of the lever, whereas DA{Bernard Day - Chassis Design}, only wants 45 lbs on the end of the lever. The discrepancy, of course, arises in the condition of the plates. If these are greased the co-efficient of friction will be low. If they are put together dry the co-efficient will be high. I should be inclined to think that DA{Bernard Day - Chassis Design}'s figure would be nearer to the co-efficient of friction occurring in service than the one you found existed when you fitted 14 lb springs, and found that this would support a 60 lb load on the end of the lever. In my own opinion the co-efficient of friction, if the shock absorber is well filled with grease, would be likely to be even less than .100. I think the above figures demand some investigation. MADE AT CROXLEY BY.{R.W. Bailey - Chief Engineer} By | ||