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 and proposed settings for hydraulic dampers on Phantom & 20HP models.
| Identifier | WestWitteringFiles\R\January1928-March1928\ 92 | |
| Date | 28th February 1928 | |
| HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer}) FROM R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence.) O.{Mr Oldham} to BJ. WOR.{Arthur Wormald - General Works Manager} OY. BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} R1/M28.2.28. REC'D, & DESPATCHED FROM WW. 2.3.28. Y235 X8520 Y5520 PHANTOM & 20HP. HYDRAULIC DAMPERS. From my own 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 of 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: | | | | Total | | | | Total | |-----------|---------|-------|-------|-----------|--------|------|-------| | 40/50 up | 66. | down | 100. | 166. | 20HP. up | 40. | down | 60. | 100. | | or up | 60. | or | 90. | 150. | or up | 50. | or | 75. | 125. | | or up | 55. | or | 110. | 165. | or up | 45. | or | 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 in pressure as practical, and the road springs of maximum 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} | ||