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).
Urgent memo regarding modifications to a strengthened aluminium push rod for the Spectre engine.
| Identifier | ExFiles\Box 91\1\ scan0041 | |
| Date | 5th August 1935 | |
| SECRET L300 To BY.{R.W. Bailey - Chief Engineer} Copy to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} E/PSN.2/MN.5.8.35. U R G E N T. We send you herewith LeC.4626 of a strengthened aluminium push rod for the SpectreCodename for Phantom III. The diameter has been increased from .312 to .375" with a resultant increase in strength of 50%, and an increase in weight from .091 lbs. to .123 lbs. The effect of the increase in weight on the total inertia of the system is only 4%. It is considered that the vent holes, at which one of the failures occurred, are unnecessary and they have been deleted. The clearance for the push rod in the cylinder head casting will be reduced by a larger diameter push rod and this point should be watched on assembly. E/PSN. Att: LeC.4626. | ||