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).
Secret memorandum including a telegram and a sketch outlining suggestions for a simpler and more practical SS exhaust pipe and silencer design.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan087 | |
| Date | 30th January 1929 | |
| DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} HS.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} (At LeCanadel.) SECRET ORIGINAL R1/M30.1.29. REC'D AT WW. 2.2.29. Copy to WCR. SG.{Arthur F. Sidgreaves - MD} SS.{S. Smith} EXHAUST PIPES. X7230 COPY OF TELEGRAM SENT. " ROYCE. CHICHESTER. ANGLETERRE. " DAY. EXHAUST PIPES HAVE TOO MANY " AWKWARD PIECES TRY WITH ELLIOTT TO " FIND SIMPLER TREATMENT POSTING " SUGGESTIONS. ROYCE. " Not only are the pieces difficult to produce but I fear some parts would not stand explosions. It may only be necessary to have one of the two boxes but even so we should try to make them more practical production scheme. Perhaps they need not such perfect silencers from a theoretical standpoint. We ought to try some smaller bore pipes instead of 2.75": let us try 2.5" and see if we can find any loss of power. I am anxious not to lose the cutout effect too much and naturally we do not want to lose power, either silenced or cutout open. I think we can do enough without making bad production parts. Some pipes as shewn might be cut off - and have been - and I cannot think there is any advantage in replacing them: uncooled parts are bad. [Diagram annotations] I do not intend to slide here but some position straight, although it might be OK. here. This expansion chamber is good & probably sufficiently effective: this treatment saves one bend on pipe. Slide here, and here, as at present. Since the head is spherical it will fit anywhere equally well. This seems as simple as at present and probably effective enough. You will realise that the pipes would slide nearly equally as well if bent because the side movement would be well within the spring of the pipe - thus, front silencer in plan (sketch on sheet 2.) (1) | ||