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).
Proposal for a trial of venturi-shaped inlet valve throats on a Wraith engine.
| Identifier | ExFiles\Box 10\3\ 03-page101 | |
| Date | 4th January 1938 | |
| 654. To HFS. from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}10/AP.4.1.38 VENTURI INLET VALVE THROATS FOR TRIAL ON WRAITH We wish to try venturi shaped inlet valve throats based on the good results obtained on the single cylinder units. These were tried in accordance with the attached scheme P.D.25. which we have pencilled over giving dimensions applicable to a wraith cylinder head EW.1296. There is no room to put inserts in a Wraith head and retain the existing size valve, therefore, this experiment necessitates starting off from a new casting in order to machine the venturi shape in the solid head. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||