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).
Tests to determine the minimum loading for hydraulic shock dampers to eliminate high-speed steering wobbles.
| Identifier | ExFiles\Box 29\1\ Scan190 | |
| Date | 1st February 1928 | |
| 457 Expl: Report! Expl: No. Ref. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG20. 2. 28. To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Ra. c. to CJ. HJ. c. to RO.{C. C. Rose - Export Manager} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} SY. c. to OY. Wor.{Arthur Wormald - General Works Manager} HYDRAULIC SHOCK DAMPERS. X235 X457 We carried out tests to ascertain what the minimum loading at which the R-R hydraulic shock dampers could be run and be effective in disposing of high speed steering wobbles. With the high pressure loading at 75 lbs, it was found that with the 6.75" semi-balloon tyres at 25 lbs/sq.in. wobbles could be eliminated. In addition, if one of these wheels was put 1 lb. out of balance, wobbles could still be eliminated. With the high pressure valve set at 50 lbs, however, 1 lb. out of balance on these tyres could not be catered for as spasmodic wobbles would then occur. We therefore consider that the minimum setting for the high pressure valve should be 75 lbs. Our tests prove the R-R hydraulic shock dampers to be more effective in preventing steering wobbles than any other type we have tested. At present the shock absorbers are being run on the bump testing rig with a high pressure setting of 100 lbs. and strengthened links. They have, up to the present, completed 15 hrs. running without mechanical failure. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||