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).
Rear track dimensions for the Silver Wraith model, comparing it to the Wraith III and Phantom III.
| Identifier | ExFiles\Box 96\4\ scan0172 | |
| Date | 17th May 1939 | |
| 356 + 666 To Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls} ... from Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. Rm.{William Robotham - Chief Engineer} Da.{Bernard Day - Chassis Design} Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}1/N.17.5.39. Re: Silver Wraith Rear Track. We have ascertained that with 59.5 rear track and 7.000 x 16 wheels the width of the top of the rear cushion of Silver Wraith will be identical with that of Wraith III. We agree that if 7.500 x 16 wheels are used, no cushion width will be lost, as the front suspension will demand that the tyre be moved out on the hub to maintain the tyre to steering lever clearance. The rear tracks would then be 61.150. The out of centre point with 7.500 wheels and the present suspension would be 2.745". This may be too much in which case it will be necessary to use the new yoke and stub axle made of reduced out-of-centre point, when the figure is reduced to 1.625". The Phan.III. track was originally 61.000 and gave a cushion top width 1.800" approx. greater than Wraith III. Although for various reasons since the first cars the rear track has increased by 2.100" to 63.100", the coachbuilders drawing has not shewn any increase width between the wheel arches. We do not know if any of our coachbuilders have appreciated the change and taken advantage of it. EV.{Ivan Evernden - coachwork} | ||