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).
Analysis of steering joggle, comparing the standard system with a La Salle gear on a Phantom III.
| Identifier | ExFiles\Box 95\1\ scan0259 | |
| Date | 1st January 1936 guessed | |
| -4- Should it be found that the stiffer rockershaft alone does make a considerable improvement, then this shows that our joggle on the Ph.III is mainly a resonant oscillation and that the gyroscopic kick from the front wheels is being magnified by this resonance. It follows that the good results obtained with the La{L. A. Archer} Salle gear are not necessarily due to its irreversibility, but rather to absence of resonance and consequently smaller forces applied to the gear by the road wheels. Although we have obtained an improvement by increasing the stiffness of the system connecting the steering wheel to the road wheels in the case of our own gear, the La{L. A. Archer} Salle is actually more flexible than our standard. This is because the long pendulum lever more than offsets the increased stiffness of the La{L. A. Archer} Salle rockershaft. We therefore intend to try decreasing the stiffness of our own system by trying side steering tube springs of very high rating and no set up load. The fact that set up loads on the steering gear are a great help in reducing joggling shows that our original idea that the load on the gear during a joggle is high was not correct. The La{L. A. Archer} Salle gear, as we are running it on 30-EX, has no appreciable set up load and we would prefer to do without it on our own gear. We are therefore making every effort to obtain results equal to the La{L. A. Archer} Salle | ||