Proposed modifications for the rear road springs on the first Wraith II car.
| Identifier | ExFiles\Box 9\5\ 05-page010 | |
| Date | 6th October 1936 | |
| To. BY. {R.W. Bailey - Chief Engineer} Copy to Dr. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} RHG. Handwritten notes: X Lott P 646 Les Please check this Rm {William Robotham - Chief Engineer} E {Mr Elliott - Chief Engineer} /EV. {Ivan Evernden - coachwork} 2/MN.6.10.36. WRAITH II - Rear Road Springs - First Car. It seems almost certain that on the first car we shall want to use the 25/30 H.P. rear axle centre box. This has gears of .850 hypoid as against the 1.625 hypoid of the Wraith II axle, therefore if we use the 25/30 axle box with suitable axle tubes with the Wraith II position of the axle relative to the frame on full load, the propeller shaft rear universal joint on maximum bump will rise .775" higher than that of the Wraith II axle. This would entail a bad foul between the propeller shaft and the rear floor, and also a foul between the universal joint and the battery cross member. To overcome this difficulty we propose to alter the camber of the rear springs and so raise the rear of the car approximately .775". The rear road springs as instructed for the Wraith II axle have .8" negative camber under full load. We wish to use with the 25/30 axle centre box rear road springs which are flat under full load. At the same time it will be necessary to lengthen for the first car, the connecting link between the axle and the lever of the shock absorber-cum-roll rod, whilst the rear axle bump rubbers on the frame will have to be packed out an amount .8" from the designed position. Would you kindly arrange for suitable springs to be instructed for this first car, and for the other modifications to be carried out. EV. {Ivan Evernden - coachwork} | ||
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).