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).
Stronger valve tappet springs for the Goshawk 11 engine, including an experimental spring and a proposal for standardization.
| Identifier | ExFiles\Box 48\4\ Scan056 | |
| Date | 16th February 1922 | |
| To Da. {Bernard Day - Chassis Design} from E. {Mr Elliott - Chief Engineer} c. to CJ c. to Wor. {Arthur Wormald - General Works Manager} c. to HY. {Tom Haldenby - Plant Engineer} c. to Hs. {Lord Ernest Hives - Chair} X4226 E2/M.16.2.22. GOSHAWK 11. STRONGER VALVE TAPPET SPRINGS. X.4226. We send you herewith drawing No.Lec.1534 shewing a stronger valve tappet spring which is only intended for experimental use in conjunction with the double valve springs to raise the speed of the engine still higher. For the purpose of standardisation Mr. Royce would like you to try a spring a gauge smaller namely, 14 S.W.G. (.080). This spring could have eleven working coils; with loads of 18.75 in position, and 24.02 lbs. valve open, corresponding stresses 62,300, and 80,000 per sq. in., the mean radius would be .335". It is very possible we should like to standardise this latter spring in conjunction with the double valve springs. E. {Mr Elliott - Chief Engineer} | ||