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).
Superior performance of poppet valve silent tappet plungers compared to ball valves at high speeds.
| Identifier | ExFiles\Box 17\6\ Scan301 | |
| Date | 4th September 1934 | |
| Y7060 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Bv. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}10/KW.4.9.34. We were somewhat mystified as to why the poppet valve silent tappet plungers were more satisfactory at high speeds than the ball valves on our recent tests. Attached is a suggestion as to why this may be so. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||