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).
Report comparing the exhaust noise of unit 19-EX after fitting a stronger downtake pipe and expansion box against unit 60.JS.
| Identifier | ExFiles\Box 11\4\ 04-page106 | |
| Date | 16th July 1932 | |
| x7941. To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hotel de France, Chateauroux, FRANCE. 16.7.32. 19-EX. We fitted the stronger downtake pipe, front expansion box, and intermediate pipe. The respective gauge being 8 SWG, 8 SWG & 12 SWG. We have not been able to appreciate any difference in the exhaust noise with the fitting of these units. We have compared the exhaust noise of 19-EX as against 60.JS.{Mr Johnson's Secretary} The tinniness of 19-EX at the front expansion box is 20% more pronounced than 60.JS.{Mr Johnson's Secretary} The exhaust beat is the worst feature. The snout noise, 19-EX is 10% more. G.W.H. | ||