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).
Blueprints for a Wraith III cylinder head modification to create a venturi shape.
| Identifier | ExFiles\Box 8\6\ 06-page22 | |
| Date | 11th January 1938 | |
| HPS.{Horace Percy Smith - Experimental Factory Mgr} c. Bm. c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. RHC{R. H. Coverley - Production Engineer}/VIC. 619 BY/A1d.9/G.11.1.38. CYLINDER HEAD - WRAITH III. SECTION 5050. Please receive herewith two blueprints of the following :- Ex.S.357 Modification to Cylinder Head. 1 off. This drawing shows the inlet ports modified to a venturi shape as called for in Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/MH.{M. Huckerby}6.1.38. No pattern work is required, but the cores should be rubbed down to produce the taper throat, as arranged with RHC{R. H. Coverley - Production Engineer}/VIC. This will, of course, leave the metal thicker than standard around the port. Kindly instruct one set. BY/A1d. Ald{F. Allwood - Experimental Design} | ||