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).
Testing a new Phantom II exhaust silencer design to reduce cooling crackle.
| Identifier | ExFiles\Box 152\3\ scan0152 | |
| Date | 27th January 1934 | |
| To Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager} c. to Wor.{Arthur Wormald - General Works Manager} c. to S. c. to By.{R.W. Bailey - Chief Engineer} X442 Hs{Lord Ernest Hives - Chair}/Wym.{G. Harold Whyman - Experimental Manager}1/KW.27.1.34. Phantom II Exhaust Silencers. -------------------- We have now tested out on 20-EX car a Phantom II Exhaust Silencer built up to Lec.3759. This scheme is intended to reduce the amount of "crackling" that takes place when the silencer is cooling down, and is such that the outer edges of the baffles are rolled instead of being flat, and the centre exhaust pipe is cut through in two places, each section of pipe being held in position by one baffle being rivetted to the outer shell. This allows for a freer movement of the centre pipe when expanding and contracting, and the rolled edge of the baffles prevents any "digging in" to the outer shell. Compared with a standard exhaust system on 20-EX, it is an improvement, the "crackles" being of a less frequency than the standard system, but it is not what one could call good, as there are still very noticeable crackles when cooling down. Hs{Lord Ernest Hives - Chair}/H.{Arthur M. Hanbury - Head Complaints} Whyman. | ||