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 memo regarding a blueprint for SS valve springs and associated testing.
| Identifier | ExFiles\Box 56\2\ Scan051 | |
| Date | 23th April 1929 | |
| X290 R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} SECRET. E1/M23.4.29. C. to Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} SS.{S. Smith} VALVE SPRINGS X7060 We send you herewith blueprint of LeC. 2697. shewing the present SS.{S. Smith} parallel spring E.78071. made taper. The average periodicity and figures of merit are as before. There is a difficulty of nearly 2000 vibrations per minute between the natural frequencies of the top and bottom ends of the spring. LeC. 2697. should be tested against E.78071. on the spring test rig. The original drawing is attached to By's copy. E.{Mr Elliott - Chief Engineer} | ||