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).
Specific parts decided upon for the construction of six Wraith III units.
| Identifier | ExFiles\Box 6\6\ 06-page200 | |
| Date | 14th May 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/AP.14.5.37 WRAITH III. UNITS. It has now been definitely decided to build the six Wraith units with the following parts:- (1) Main bearings in RR.Std. whitemetal on steel shells to Ex.26373/4/5/6/7. with RR.56 shims. (2) Big end bearings in A.C.6. Shims in steel as detailed. (3) Valve springs to Rs.{Sir Henry Royce's Secretary}500. (4) Inlet valves in S.65 material. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||