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 hydraulic dampers for Phantom and 20 HP models.
| Identifier | ExFiles\Box 105\3\ scan0026 | |
| Date | 28th February 1928 | |
| X5520 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} from R.{Sir Henry Royce} c.c. to BJ. Wor.{Arthur Wormald - General Works Manager} OY. BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} RL/M28.2.28. PHANTOM AND 20 HP. HYDRAULIC DAMPERS. X.235 X.8520 X.5520 From my experience, and what I hear, I am still of the opinion that we ought to increase the standard loading of our dampers so that we can use flexible road springs without the risk of sea-sickness. To do this with the minimum harsh riding I think we must make the 'up' much lower than the 'down'; unless we do this we are not taking full advantage of what the hydraulic allows. I should like to try the following. | 40/50 | Total | 20HP | Total | |--------------|-------|--------------|-------| | up 66 down 100 | 166 | up 40 down 60 | 100 | | or up 60 " 90 | 150 | or up 50 " 75 | 125 | | or up 55 " 110 | 165 | or up 45 " 90 | 135 | Perhaps the middle one would be found best, but the bottom should be tried. I am sure that too much damping is better than too little, but make the tyres as low as in pressure as practical, and the road springs of max. flexibility. 14-EX runs much better with 30 lbs. tyre pressure than 35 lbs. - quite a marked difference. It would do with more damping - total from your figures 130: should like to try 25% more. Front clearance insufficiently clear of buffers. It is a beautiful riding car, but wants a little more damping I feel certain. R.{Sir Henry Royce} | ||