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).
Issue with whistling rear exhaust silencers on the Wraith model.
| Identifier | ExFiles\Box 108\3\ scan0257 | |
| Date | 9th September 1938 | |
| To RHC{R. H. Coverley - Production Engineer}/EM. 600a also 623. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}8/JH.9.9.38. WRAITH EXHAUST SYSTEM. We are still having occasional rear exhaust silencers with a tendency to whistle and are endeavouring at the moment to find the cause. For instance LA.{L. A. Archer} informs us that more of the 24 production cars have this whistle, but we have had 3 silencers on our cars with the complaint, and the production silencer just fitted to 26.G.VI. car for Sales use also "whistles", and we are afraid that although the percentage of "whistlers" on production may be small, it can be a cause for complaint from a customer. We would therefore suggest that production of rear silencer should be such, that you can meet immediate requirements, but do not make a large quantity of stock in case we call for a slight modification. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||