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).
Exhaust system alterations, radiator movement, and frame stiffness issues.
| Identifier | WestWitteringFiles\T\March1929-December1929\ Scan125 | |
| Date | 14th May 1929 guessed | |
| (2) I shall be glad if you will alter the exhaust system by breaking up the length of the pipe as we have done in the case of SS.{S. Smith}, and we shall send you our more recent ideas with the perforations in the silencers graded towards the rear by increasing the resistance of the perforations in the diaphragms, making them two or three times greater as you go towards the swan neck outlet. DA.{Bernard Day - Chassis Design} is sending you this idea to be tried on SS.{S. Smith}, as a means of quietening the exhaust without undue resistance. There is still another possibility about this radiator movement, and it refers to how much is the frame stiffened by the body, either the permanent or temporary bodies that are fitted during test. In this case it would appear that very little stiffness is derived from the body. Also the weight of the engine does not in this case lower the period as we would wish, and as the frame derives no stiffness from it, therefore the movement is great, and the periodicity high, whereas we want great stiffness and low periodicity. R.{Sir Henry Royce} | ||