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).
Design and application of dampers for the 25 HP and Phantom II models, including proposals for future horizontal dampers.
| Identifier | ExFiles\Box 182\M19\ img020 | |
| Date | 12th February 1931 | |
| -2- Hs{Lord Ernest Hives - Chair}/Ru.1/AL.12.2.31.Cont'd.{John DeLooze - Company Secretary} The ball end at the top of the torque control allowing three or four degrees spring controlled movement to take care of the quarreling occasioned by the short arm. We think that the pivots could be allowed to lean up to 2" forward without there being any danger of the steering taking charge. We feel convinced that if the shock absorber case for this position was made in cast iron it would easily deal with the braking torque owing to the load being softened by the compression of the front road spring rear end. This has been proved feasible by Springfield. As a means of bettering existing material, we should like a scheme for passing the air vent oil on to the top pin joint in the existing control damper. 25 HP. At the present moment we have four different types of damper in production for two cars, this is hardly compatible with economy. It will be noted that the proposal on the Phantom 2 is to have both front and rear dampers to exactly the same design which will be of the existing Phantom 2 rear type. We consider that this is the best design of existing hydraulic dampers from the point of view of accessibility, etc. We think that we should arrange to use this damper for the front and rear of the 25 HP. car without even altering the feet because it is the only way we can expect to get the cost of our hydraulics down to a reasonable figure. As far as we can see there is no reason why this cannot be arranged. FUTURE DESIGN. We have sent you a sketch of a simplified damper. You will note that this is a horizontal type and that R.{Sir Henry Royce} in his recent memo shows a leaning towards this type. We have sent R.{Sir Henry Royce} both the double piston and single piston Delco and we think that from this he will be even more convinced that the horizontal scores so much for economical production that it is a better type in spite of the virtues of the double piston damper in one or two respects. Our main apprehension on the double piston damper that is now being got ready for test is that it incorporates a valve of which we have no previous experience. Hs{Lord Ernest Hives - Chair}/Ru. | ||