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).
Design and simplification of exhaust pipes, including a copy of a telegram.
| Identifier | ExFiles\Box 14\6\ Scan056 | |
| Date | 30th January 1929 | |
| X.7230 R1/M30.1.29. DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to Wor.{Arthur Wormald - General Works Manager} Sg.{Arthur F. Sidgreaves - MD} SS.{S. Smith} EXHAUST PIPES. COPY OF TELEGRAM. 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. I do not intend to slide SEE ORIGINAL FOR SKETCH. here but some position straight. This seems a s 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) SEE ORIGINAL FOR SKETCH. The vertical pipe from the engine at 2.75" bore dia. or 2.5" should be able to carry the weight of the front silencer even when hot providing that we stay it (the pipe or the front box) longitudinally or transversely, but vertically flexible. There is great advantage in only attempting a sliding a joint as late as possible because as you say of the expansion difficulties. contd :- | ||