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).
Programme for the development and testing of shock dampers and associated damper rigs.
| Identifier | ExFiles\Box 159\6\ scan0016 | |
| Date | 27th May 1937 | |
| SHOCK DAMPER PROGRAMME. ARMSTRONG DAMPERS. Damper valve Rm.{William Robotham - Chief Engineer}366. We should like a report of this valve. In order to use rod control dampers we need a valve whose spring load is considerably less than the valve effective area. The control on 33-EX with the latest Armstrong dampers is still much too heaving. Rm.{William Robotham - Chief Engineer} wishes to try an Armstrong damper, with definite slack in the bearing, for knocks. Whenever possible development work should be continued on Armstrong dampers, such as:- diagrams, oils, glands. We should like to try to keep an Armstrong damper running almost continuously. DAMPER RIGS. A.{Mr Adams} Indicator Diagram Rig. The new rig needs to be calibrated so that it is easy to read the damper load from the height of the diagrams. The diagrams should mark from left to right instead of right to left. This can be done by reversing the position of the paper. Diagrams should then be taken from various dampers, using knife edge and hydraulic indicator, e.g., standard damper, valves sticking etc. We should like a diagram of a Hartford damper. If this rig is satisfactory, it is proposed to use a similar rig for production damper settings. A series of dampers should be set on the rig and then checked with a spring balance for load. B. Wraith Front Suspension Unit. This unit will soon be returned to you. We should get a complete set of diagrams for 6" strokes and 2" strokes. C. Phantom III Front Suspension Unit. Diagrams should be taken with the large tube dampers N.Sch.4946. A reliable method for obtaining the reduced load replenishing valves is necessary. D.{John DeLooze - Company Secretary} We need a rig for checking the leak in dampers. Fords, Morris and Armstrongs use a Ferranti time clock, which is connected to measure the time that a weighted lever takes to move through a certain angle. Particulars are being obtained of the Ferranti time clock. | ||