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).
Car controllability issues related to spring flexibility and damper oil viscosity.
| Identifier | ExFiles\Box 51\4\ Scan119 | |
| Date | 12th August 1926 guessed | |
| contd :- -2- Due to the unrestrained flexibility of the springs on one side, the car became quite uncontrollable, and almost left the road. We are of the opinion that with Prices Motorine 'C' there is considerable viscosity effect due to the somewhat small area of the high pressure valve port. We are arranging to measure this and if our surmise proves correct it will possibly be necessary to use some oil with a more constant viscosity. We are not certain however that for a rear shock damper, a certain amount of viscosity effect might not be desirable. It seems probable that if we can get sufficient damping at the extreme of the axle movement, it will be unnecessary to allow quite so great a movement for maximum rebound. We are fitting up a pair of dampers with a certain amount of unrestrained central movement but with 150 lbs. load on maximum bump and rebound. We are casting a case in special material to deal with the extra pressure. It seems rather improbable that the sz levers will be able to withstand the load, however, even for test purposes. Hs {Lord Ernest Hives - Chair} /W.A.Robotham. | ||