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).
Proposal to modify the Spectre connecting rod design to simplify the manufacturing process.
| Identifier | ExFiles\Box 93\1\ scan0111 | |
| Date | 15th February 1935 | |
| COPY. +314 SECRET. Copy to Swdl{Len H. Swindell} 15/2/35 To By.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer} E.9/HP.15.2.35. c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} SpectreCodename for Phantom III Connecting Rods. It has always been our practice on aero rods to make the blade rod locate in the forked rod and then to locate the rod assembly by means of the piston bores. This, however, necessitates some expensive and complicated machining on the strap type rods for producing the fly-cut faces in the blade rod and milling behind them, and moreover if it is logical to locate rods which we always do from the piston and allow the big-end to float it should be logical to allow the blade rod to float in the forked rod. We, therefore, propose on our LeC.3860 to allow this float by reducing the width of the blade rod accordingly and on the assumption that the blade rod will never touch sideways the fork rod will only require the simple milling operation for finishing out the fork. With reference to the curved foot type of rod shewn on LeC.3728, the same considerations do not apply in respect to the machining of the forked rod but they do apply in respect to lining up the bores of the cylinders on the opposite side of the Vee, and we therefore think we should have the 10 thou. float in this case as well. E.{Mr Elliott - Chief Engineer} | ||