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).
Modification to the Wraith III and B.III units concerning tappet drain holes.
| Identifier | ExFiles\Box 10\3\ 03-page111 | |
| Date | 19th January 1938 | |
| 664 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to Da.{Bernard Day - Chassis Design} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/AP.19.1.38 WRAITH III. Now that we use hollow bottom tappets with a drain hole in the base of each tappet there is no necessity for the 6 drain holes back into the crankcase through the base of the block. Will you therefore instruct that these 6 holes in the block and crankcase be dispensed with. This modifications also applies to the B.III.unit. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||