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 memorandum regarding the Spectre engine's larger exhaust valve and instructions for fitting.
| Identifier | ExFiles\Box 96\2\ scan0031 | |
| Date | 4th March 1935 | |
| SECRET. X357F To BY.{R.W. Bailey - Chief Engineer} from E/JNR.{Charles L. Jenner} c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} E/JNR.{Charles L. Jenner}1/HP.4.3.35. re SpectreCodename for Phantom III - Larger Exhaust Valve. We send you herewith:- LeC.4218 showing the above. The diameter of the valve has been increased 1.25. The valves are shewn drilled up, and retaining rings are provided to prevent the valve dropping into the cylinder. Will you please instruct this as soon as possible to be fitted to No.5. engine. E/JNR.{Charles L. Jenner} | ||