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).
Instructions regarding steering wobble on model 2025E, attributed to the extra weight of Palmer tyres.
| Identifier | ExFiles\Box 28\4\ Scan131 | |
| Date | 11th February 1925 | |
| (24 B) (WW. 755. 15.9.24) E.P. 7218. ROLLS-ROYCE LIMITED. INSTRUCTIONS. ENCLOSURE No 422 XH57 To: Wor.{Arthur Wormald - General Works Manager} Order No. Customer's No. Re Steering Wobble on 2025E (recently at N) We are of opinion that the wobble is the result of the extra weight of the Palmer tyres, + that it is controlled by the springs in the side steering tube. The heavier the tyre, the stronger the springs in the side steering tube should be. It should be made clear that packing a spring with washers has not quite the same effect as a stiffer spring, as if a spring be packed the pressure on the ball ends is greatly increased, but the "rate", or number of pounds per inch deflection, remains unaltered, whereas a stiffer spring might exert no greater pressure on the balls, but its "rate" would be greater. It is true that packing side steering tube springs does in some cases reduce or cure a wobble, as the natural period is altered thereby, + also the friction on the balls is Signed This Sheet must be filed on completion of the work. Continued | ||