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 of a silencer's swan neck and drain plug.
| Identifier | ExFiles\Box 152\3\ scan0019 | |
| Date | 25th November 1912 | |
| R.R. 235 A (150 H) (V.V. 522. 10.2.14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0345. COPY. X442 FHR7/H251112 GRAND HOTEL DU CANADEL? Par le Lavandou, (VAR) 25th Nov. 1912. X1189 Mr Johnson from F.H.R. for T.C. With reference to the arrangement of Swan Neck to Silencer. I do not understand why it is necessary to introduce a plug, which is called a drain plug, to the bottom of the silencer. I am fully aware that water does occur in the silencer, but there should be sufficient heat to evaporate it, and if so it need not drain out. If this is so there must be a considerable amount of water between the diaphragms, unless we make provision for it, which we could easily do if we found it necessary. When this swan neck was pût on originally, we drilled a small hole in the bottom of the silencer about which no one would ever know anything, but which would let out any water which would be likely to accumulate. The ponderous plug shown would never be used, at least I cannot imagine a chauffeur making use of it for draining out the water at regular intervals; consider if we had to put this in the Instruction Book. Also I do not understand that it has been found necessary to introduce the proposed link, because this is a very undesireable fitting unless the elasticity of the pipe shows it to be required. If we intend to fit | ||