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).
Secret memo regarding design changes to the Spectre engine roller tappets and camshaft.
| Identifier | ExFiles\Box 96\2\ scan0025 | |
| Date | 11th February 1935 | |
| Ll. Smith Please see me To EY. from E/JNR.{Charles L. Jenner} SECRET. E/JNR.{Charles L. Jenner}1/HP.11.2.35. c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. RHC.{R. H. Coverley - Production Engineer} Re SpectreCodename for Phantom III - Roller Tappets. We send you herewith:- LeC.4353 showing the design for the roller tappets. It will be noticed that the diameter of the camshaft has been reduced from 1.2" to 1", which will mean making some new camshaft bearings. In regard to the tappet blocks, it may be possible to bore them out without altering the castings. The clamping dogs are unchanged. We want to get the proportions of the tappet and guide correct so we suggest that RHC.{R. H. Coverley - Production Engineer} should make us a one off model in mild steel. E/JNR.{Charles L. Jenner} LeC.4353 herewith. .950 .475 .525 .050 2 1/2 dia 1.25 r.{Sir Henry Royce} .05 1.20 2 1/4 dia | ||