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).
Damper performance, valve accessibility, and load measurements for various car models.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan005 | |
| Date | 2nd December 1930 | |
| -5- securing the rear dampers "spring" quite appreciably. We are taking exact measurement but the movement is clearly visible when the damper is running under normal loads. There have been some complaints of the way the 25 HP. cars hold the road and we consider that this may be a contribu- tory cause. ACCESSIBILITY OF VALVES. We understand that production greatly appreciate the accessibility of both valve springs on Phantom II dampers. The valve in the piston, whilst admirable from every other point of view, presented difficulties in obtaining an exact load the high rating small springs varying appreciably. Hs{Lord Ernest Hives - Chair}/Bn.{W.O. Bentley / Mr Barrington} Drilled valves and 20 HP. diagrams will follow later. ----------------- N.B. The "effective mean ball pin load" given on each indicator diagram in Fig.1 represents the average actual poundage of damping which is transmitted from the damper to the axle at the strokes in question i.e. L.P. damper loading is set statically for a mean load of 80 lbs. but the effective mean load for fast 1" movements is only 36.5 lbs. or an efficiency of 46% for this condition. We have made actual road tests measuring the axle movement which indicate that these three types of test to which we subject the shock damper represent approximately what this fitting has to do under the circumstances named. | ||