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).
Urgent request to modify the Wraith valve gear by altering the rocker ratio.
| Identifier | ExFiles\Box 10\3\ 03-page063 | |
| Date | 2nd September 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Wym.{G. Harold Whyman - Experimental Manager} 6574 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}13/MH.{M. Huckerby}2.9.37. WRAITH VALVE GEAR. Will you please detail and instruct for parts to be made to the attached scheme M.C.D.9, whereby the rocker ratio is altered to give a valve lift of .350 in place of the normal .400. We should appreciate this being made an urgent job. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||