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).
Suggestion to ascertain the temperature of valve springs during flight due to their cost and unreliability.
| Identifier | ExFiles\Box 158\5\ scan0072 | |
| Date | 13th May 1940 | |
| Lr{Mr Ellor}/PSN. from Rm.{William Robotham - Chief Engineer} Rm.{William Robotham - Chief Engineer}14/ML.13.5.40. VALVE SPRING TEMPERATURE. With reference to Lr{Mr Ellor}/Psn.10/EW.9.5.40. I suggest, that since valve springs are very expensive items and have from time to time been the source of unreliability, it is well worth ascertaining what temperature they do attain in flight. Rm.{William Robotham - Chief Engineer} | ||