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).
Performance of Phantom III hydraulic dampers and proposing a test for a new valve design.
| Identifier | ExFiles\Box 95\4\ scan0084 | |
| Date | 24th February 1937 | |
| 342 To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}1/AP.24.2.37. HYDRAULIC DAMPERS. We know that the front dampers of Phantom III. have the characteristic that while they damp low frequency movements effectively they do not do so when operated at high frequencies, and we suspect that the same applies to all our dampers. This characteristic is to the disadvantage of steering, and braking and cornering on rough surfaces. We wish to try on the rig in the Tomb the positive replenishing valve shewn on the attached Rm.{William Robotham - Chief Engineer}332. This ensures that the low pressure side of the damper piston is connected to the oil reservoir so that building up cannot occur. Will you please detail this and make one off. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||