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).
Shock absorber loading and spring deflection tests for comfort, referencing Phantom II and 20/25 HP models.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan044 | |
| Date | 23th May 1931 | |
| -2- Ha/Sm.2/JL.23.5.31.Contd. the last half inch of rear spring deflection for comfort we shall always have complaints similar to those tabulated. With regard to shock absorber loading. We consider from our tests that we have always erred on the side of over damping for the average Rolls-Royce owner who rides in the back and seldom is driven at more than 60 M.P.H. The loads we use at present on Phantom ll are :- FRONT Up. 70 Down. 90 REAR " 30 " 85 These loads were arrived at by means of a series of tests lasting a considerable time carried out independently both at Derby and Chateauroux. The results of these tests were reported in Hs{Lord Ernest Hives - Chair}2/LC. 29.4.31. We started G.W.Hancock off with loads of 100 down and 50 up on both front and rear dampers and he reported un- favourably on the low speed riding. We repeated these tests recently on the front in connection with front 'jellying'. We are just concluding a further series of tests on damper loadings front and rear which confirms that our standard poundage is on the upper limit for a good low speed ride. We have tested out the schemes of air vessels to give a small range of undamped movement on the 20 HP. and the spring controlled connecting link for the same purpose on the 20/50. The results in both cases indicate that they produce axle dither and have not a good affect on pitching. C.W.Hancock has been running the spring controlled links on 23-EX in France. We started off with the fixed idea that we would not use drilled valves on Phantom ll, but the Repair Dept have managed | ||