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).
Letter discussing damper design principles, rig testing, and application for the Phantom III chassis.
| Identifier | ExFiles\Box 152\1\ scan0300 | |
| Date | 26th April 1937 guessed | |
| -2- The attached sketch, Rm.{William Robotham - Chief Engineer}366 shows the principle. The advantages that we hope to get are as follows. (1) No loss of damper load due to pressure building up in the damper. (2) Single valve spring. (3) From the fact that the effective area on both strokes is a difference of diameters, it is possible to have a large valve seat with a small valve spring load. So far our rig tests with this valve are very encouraging, and I am having one of these valves (not cam or control operated) fitted to one of your dampers. I should be very interested to have your criticism of this valve. Thank you for your letter dated 22nd inst. I agree that we are being optimistic in using your medium size damper for Phantom III, but your large damper would need considerably more chassis alterations. So that it is well worth giving the smaller damper a thorough trial. With the larger shaft in the medium damper there should be a good chance of success. I think there should be no difficulty in getting castings off your patterns in less than a week. However, in order to save complications I am sure it will be best to concentrate all our efforts on the medium size of damper. I am about to test on our bumper rig the latest pair of dampers that you sent, set to a load of 400 lbs. We have had to fit special valve springs to get this load. It will be interesting to see how long the shafts last. Yours sincerely, FOR ROLLS-ROYCE, LIMITED. | ||