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).
Modifications to rear springs and suspension to cure oversteering.
| Identifier | ExFiles\Box 153\1\ scan0064 | |
| Date | 23th September 1937 | |
| -6- RM {William Robotham - Chief Engineer} /FJH. {Fred J. Hardy - Chief Dev. Engineer} 1/AP.23.9.37 by raising the roll centre. Unfortunately positive camber of the rear springs leads to oversteering, and raising the roll centre sufficiently to cure the shake resulted in excessive oversteering. To overcome this, the forward eye of the spring was turned under the main leaf, so that applying the construction previously mentioned, oversteering would be considerably reduced, and the rear spring eye is then offset upwards to raise the plane of the eyes and so the roll centre. Even with this, it was difficult to maintain reasonable steering and reasonable freedom from shake unless a tension shackle was used. The effect of the tension shackle was not explained and it is a little difficult to see why it should help in this respect, but we were assured that it does. The final layout recommended is similar to that shown in Fig.8., the corresponding linkage also being indicated by the chain-dotted lines. The spring seat has been brought as close under the axle as possible. Da {Bernard Day - Chassis Design} /D.Bastow. Rm {William Robotham - Chief Engineer} /F.J.Hardy. | ||