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).
Suspension geometry effects, comparing Dubonnet and Cadillac systems, with an accompanying blueprint.
| Identifier | ExFiles\Box 154\1\ scan0105 | |
| Date | 12th February 1934 | |
| -2- HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/IGR.12.2.34. over-self-centering effect which is so objectionable. This effect is reduced if the wheel angle to the ground is straightened up as the spring deflects, and this is accomplished by attaching the top arm to the pivot so that it makes an angle with the horizontal as shewn in sketch. This merely emphasises the effect due to one arm being shorter than the other and concentrates this effect on bump rather than re-bound. Its efficacy seems dubious to me as it increases the transverse king pin lean at the same time as it alters the wheel angle, and more transverse lean causes more self-centering. (C) Oy. thinks the best Dubonnet example is fitted to the Opel. He is quite convinced, however, that the Cadillac scheme is the best for the large car from the point of weight, cost and efficiency. He thinks the friction of any lever ratio coupled with the probable friction of the coil spring in its tube is likely to be enough to spoil the ride | ||