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).
Query regarding the functional temperature of Merlin valve springs in flight.
| Identifier | ExFiles\Box 143\3\ scan0175 | |
| Date | 12th April 1940 | |
| 1204 Lr.{Mr Ellor} from Rm.{William Robotham - Chief Engineer} Rm.{William Robotham - Chief Engineer}18./ML.12.4.40. Have you any figures as to the temperature at which Merlin valve springs function in flight? Rm.{William Robotham - Chief Engineer} | ||