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 discussion on steering system design, including worm and nut pitch, pivot intersection, and overhang.
| Identifier | ExFiles\Box 28\4\ Scan060 | |
| Date | 18th September 1913 | |
| COPY. X457 R4/P 18.9.13. To Mr.Day from R.{Sir Henry Royce} Copy for J.{Mr Johnson W.M.} " " Wor.{Arthur Wormald - General Works Manager} With reference to the steering of our cars, I think we might try a worm and nut having a 1" pitch instead of 1⅛", that is about 11% slower. With reference to your note in regard to leaving a slight amount of overhang, to allow for the rolling of the tyre, I shall be quite satisfied if we get within half inch of the intersection desired, but I cannot see why the steering should become unstable if the point of contact crosses over to the other side. On the Sheffield-Simplex I have seen, there seemed to be very little attempt at getting the pivot to intersect the cont act with the road, and I understood from the driver that this car had a tendency to pull the steering wheel out of your hand in turning the corner. This is what would happen if the wheel overhange the steering pivot in the usual way, the reason for this can be accounted for, but itis rather complex to write down. We hope, however, to avoid it, by getting the intersection approximately as arranged, and we will work between the true intersebtion and your ½". In the three cars we have compared, we find that the steering is much more tiring than ours, owing to the friction, possibly in the steering pivots, | ||