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).
The modification of the B.V. gearbox for the Wraith 80, noting test failures and a new strengthened design.
| Identifier | ExFiles\Box 109\1\ scan0164 | |
| Date | 28th October 1939 | |
| 666 To Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} from Ev.{Ivan Evernden - coachwork} Ev.{Ivan Evernden - coachwork}4/MH.{M. Huckerby}28.10.39. RE B.V. GEARBOX MODIFIED FOR WRAITH 80. The schemes for the B.V. gearbox modified to suit Wraith 80 are PD.477 and PD.478. Both schemes have been detailed. The coupling teeth of the 3rd. speed which are one of the non-strengthened parts on the Wraith 80 box mentioned above, have failed on test. A strengthened design PD.495 was produced for all boxes, but not detailed. Ev.{Ivan Evernden - coachwork} | ||