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 the Phantom III air silencer and the subsequent deletion of its support bracket and stiffening diaphragm.
| Identifier | ExFiles\Box 152\3\ scan0191 | |
| Date | 5th May 1937 | |
| 1297 WYM {G. Harold Whyman - Experimental Manager} Is this OK Copy to Du. Rn. {Mr Robinson} HPS. {Horace Percy Smith - Experimental Factory Mgr} E {Mr Elliott - Chief Engineer} /PSN.1/M.5.5.37. GRY {Shadwell Grylls} Please write Confirmatory note to By Rm {William Robotham - Chief Engineer} AIR SILENCERS SUPPORT P.III. FOUR PORT HEAD. It was agreed some time ago to test the P.III. air silencer on the four port head without the stays to the induction pipes as at present on production. This has been done and has proved satisfactory, and we shall be pleased if you would now delete the bracket which carries these stays and the stiffening diaphragm from the air silencer LOP. for the four port head. GRY {Shadwell Grylls} [struck through text] run 20,000 miles on 35EX -and rivets -are loose E {Mr Elliott - Chief Engineer} /PSN. [Signature] | ||