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 axle geometry and spring design for the 'Myth' model.
| Identifier | ExFiles\Box 110\3\ scan0002 | |
| Date | 9th July 1940 | |
| Ex. from Ra/PJH. C. Rm{William Robotham - Chief Engineer}/EAG. C. Ra/GB. 1030 Ra/PJH.10/JHS.9.7.40. 746 MYTH REAR SPRINGS. No. Ev.{Ivan Evernden - coachwork}7/JHS.5.7.40. We think that Myth rear axle geometry should be no worse than B.V., as we know that the rear axle of the latter contributes to the existing unintentional steering effects. This was proved when we fitted to the rear wheels of a B.V. Michelin Pilot, tyres having one third the normal slip angle, and obtained alternating sideways accelerations at the rear of the car that were uncomfortable to the passengers. It is true that from the point of view of steering characteristics one can compensate for a narrow spring base by increasing the stiffness of the roll rod, but this increases harshness for one wheel bumps. We, therefore, would like the spring base to be as wide as possible. We agree that the tension shackle should be retained, and we applaud your arrangement of non-lubricated spring eyes and lubricated shackle bearing. Ra/PJH. | ||