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 to Armstrong Patents Co. Ltd. concerning test results and leakage issues with a D.A.S. 10 damper.
| Identifier | ExFiles\Box 152\2\ scan0176 | |
| Date | 16th February 1940 | |
| 1293. Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham}8/ML. 16th. Feb: 1940. Messrs Armstrong Patents Co.Ltd., Eastgate, Beverley, E.Yorks. For the attention of Mr. Armstrong. Dear Sirs, We have carried out further tests on your D.A.S. 10 damper with piston rings and with .001" diametral clearance pistons, and we regret to say that we have obtained no improvement in the diagrams. As there is still quite a considerable leak past the pistons when warm we should be obliged if you would make us a pair of no clearance pistons. We are prepared to heat the case up if necessary before assembly. However, we think that the greater part of the leakage when hot is taking place between the sealing piece and the case. We believe sealing piece is the name of the piece which screws into the bottom of the case and contains the valve. - Continued - | ||