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).
The testing of SS valve springs, noting a difficulty with natural frequencies.
| Identifier | ExFiles\Box 17\6\ Scan098 | |
| Date | 23th April 1929 | |
| R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} SECRET. X7060 El/M23.4.29. C. to Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} Ey. SS.{S. Smith} VALVE SPRINGS X 290 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 Ey's copy. E.{Mr Elliott - Chief Engineer} | ||