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).
Technical letter diagnosing steering wandering on a 25 HP chassis due to bad geometry.
| Identifier | ExFiles\Box 106\3\ scan0403 | |
| Date | 25th August 1936 | |
| X530 To G.W. Hancock, Hotel de France, Chateauroux, Indre, France. Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}17/KW.25.8.36. 25 HP. Steering. The steering wandering of which you complain on the 25 HP. chassis is probably mainly due to bad geometry of the side steering tube. This results in quarreling between the arc through which the front end of the side steering tube moves and the arc through which the ball pin on the ramshorn lever wishes to move when the car rolls. This is affected to a certain extent by the length of the pendulum lever, and to a much greater extent by the camber of the front springs. The less the camber of the springs and correspondingly the less the buffer clearance, the less is the quarreling. We therefore recommend that you should check the buffer clearance on Sr's car and, if this is greater than on 22-G-V, fit lower poundage front springs to make the clearance as small as is practical. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||