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).
Noise issues and potential modifications to an exhaust system.
| Identifier | WestWitteringFiles\M\October1924-December1924\ Scan20 | |
| Date | 10th October 1924 | |
| ORIGINAL TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} S E C R E T. Copy to [redacted] E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. 3 & 2. EXHAUST. Handwritten: X8230, X9230 (crossed out), X8490 (crossed out) This is the type that is hardly satisfactory in the exhaust, (not E.A.C.2. as mentioned in Mr. Johnson's memo. of yesterday.) This noise has been noticed by us for some little time and HS.{Lord Ernest Hives - Chair} was finding the cause before trying any blind remedies. Naturally this exhaust is not quite so good as the original exhaust, (which was two 3s.) either for efficiency or silence, but it can be made satisfactory for this engine. The noise seems to arise from the exhaust entering the front silencer, and it is thought that this silencer would be better if it was divided into diaphragms. It may be better however to cut the silencer slightly shorter, and fit it with a bend, so that the gas enters the silencer by the end instead of across the end. If this could be rigged up temporarily it may be found that the silencer would do without diaphragms, and slightly more power could be obtained with this arrangement. In the memo. with reference to E.A.C.2. there is a special cutout designed for this chassis, which we think will render the exhaust noise more moderate, and more pleasant. If however this cutout does not give satisfaction I think a single butterfly cutout at the rear end of the silencer should be tested. E.A.C.2. exhaust is now quite good for power and silence: naturally slightly different because of the 40% more power. R.{Sir Henry Royce} | ||