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).
Trial and standardisation of a stronger valve tappet spring for the Goshawk engine.
| Identifier | WestWitteringFiles\H\February1922\ Scan27 | |
| Date | 16th February 1922 | |
| ORIGINAL RECEIVED FEB 17 1922 2. Hs{Lord Ernest Hives - Chair} E2/M/16.2.22. TO Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to Wer. c. to Sy. c. to HS.{Lord Ernest Hives - Chair} GOSHAWK 11. STRONGER VALVE TAPPET SPRINGS. X4226 We send you herewith drawing No. Lsc 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 SWG (.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} | ||