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 on hydraulic shock dampers to determine the minimum loading required to prevent high-speed steering wobbles.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan127 | |
| Date | 2nd February 1926 | |
| Expl: Report. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to OY. Wor.{Arthur Wormald - General Works Manager} Expl: No. Ref. Hs{Lord Ernest Hives - Chair}/RMS/LG20.2.26. ORIGINAL HYDRAULIC SHOCK DAMPERS. X235/X457 We carried out tests to ascertain what the minimum loading at which the RR hydraulic damper 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. | ||