Inefficiency of the Phantom III Air Silencer and its replacement.
| Identifier | ExFiles\Box 93\2\ scan0138 | |
| Date | 20th February 1936 | |
| To RHC. {R. H. Coverley - Production Engineer} X308 Hs {Lord Ernest Hives - Chair} /Wym. {G. Harold Whyman - Experimental Manager} 5/KW.20.2.36. Phantom III Air Silencer. Will you please note that the air silencer to LeC.4880 for the above cars has proved only 50% effective for silence. We have handed over to E. {Mr Elliott - Chief Engineer} an experimental silencer which gives us 100% silence efficiency, and a design is being prepared immediately. This is the silencer to go into production, the silencer to LeC.4880 now being considered obsolete. Hs {Lord Ernest Hives - Chair} /Wym. {G. Harold Whyman - Experimental Manager} | ||
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).