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).
List of parts required to update Wraith cars and the allocation of engine units.
| Identifier | ExFiles\Box 6\6\ 06-page395 | |
| Date | 13th December 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}6/AP.13.12.37. WRAITH CARS. The following is a list of parts required to bring our Wraith cars more up-to-date. It does not include 26.O.V1. which is now being prepared for 10,000 miles test, or 29.O.V1. We are assuming that the first two correct Wraith engine units will be fitted to 26.O.V1. and 27.O.V1., leaving the third unit available for 29.O.V1. and No.6. unit which is at present on the test bed can be modified and later fitted to 29.O.V1. It is possible of course that a number of the pieces asked for are already made, and the number off column should be treated as requirements for our cars in their present condition, and not the number of parts still to be made. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||