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).
Steering issues like 'tramping' and 'joggles' and proposed solutions for achieving perfect geometry.
| Identifier | ExFiles\Box 68\1\ scan0081 | |
| Date | 29th August 1929 | |
| OY-1 X8430 August 29, 1929. TO: Mr. Beaver. FROM: Mr. Olley. cc Mr. Ainsworth Mr. Caswell Experimental Dept. Mr. Burton Mr. Southern Mr. Hives (England) STEERING - SECTION 7050. Further to OY-1, August 23rd, from inspection of wheel motion on chassis and a car without front mudguards, we can find no evidence that there is any considerable disturbance in the straight ahead position of the front wheels on ordinary road surfaces at any speeds up to 50 m.p.h. From this speed upwards tramping conditions appear to assert themselves i.e. the wheels (as described in English reports) tend to swing outward as they meet the ground. We conclude from this that for freedom from joggles the best condition will be a height of ball and side steering tube position which will give the closest approximation to a perfect geometry which it is possible to get. This should give a steering free from reactions up to the speed where tramping starts - and any tramping tendency will have to be tackled separately by - Effective shock absorbers. Adjustment of pivot lean. Stiffened frame - etc. We are having the six steering levers on D-3742 made three with the ball raised 3", and three with the ball raised 2". The 3" lift will give slight "S. Ghost" geometry, and the 2" will give practically a neutral steering. We can then readily find by trial which of these gives the better steering. OY. | ||