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).
Noise issues in Wraith shock dampers and comparing complaint statistics with the Phantom III model.
| Identifier | ExFiles\Box 9\8\ 08-page12 | |
| Date | 22th April 1937 | |
| 642 Hs.{Lord Ernest Hives - Chair} from Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} Rm{William Robotham - Chief Engineer}/Les3/R.22.4.37. WRAITH SHOCK DAMPER KNOCKS. There is very little reason why Wraith dampers should be less noisy than P.III dampers. The load of the P.III front dampers has been reduced to a minimum to prevent knocking. After extensive rig tests it appears to be impossible to produce a quiet and more powerful damper which is not a separate unit. Wraith rear dampers will not knock if they are produced accurately. If the dampers are built in a new section of the Works, as contemplated, care will be needed to retain the degree of accuracy. The figures below are taken from the latest Quarterly complaints - Hd{Mr Hayward/Mr Huddy}10/AR.10.2.37:- 30 H.P. P.III. Hydraulic Knocks. December Quarter C.C. 1 - C.P. 1 - Previous Quarter C.C. 1 - C.P. - - Six Months ............ 3 - Failure of Governor Control. December Quarter C.C. 2 1 C.P. - - Previous Quarter C.C. 3 - C.P. 2 - Six Months ............ 7 1 This shows that there are only a few complaints of knocking from the present production type of chassis. At the moment, work is being done to obtain a satisfactory damper which will require less accurate manufacture, and will give the full requirements without a hydraulic control system. Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} | ||