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).
Test report page detailing vehicle suspension settings and their effects on anti-wobble, road holding, and steering characteristics.
| Identifier | ExFiles\Box 17\3\ Scan088 | |
| Date | 1st September 1926 guessed | |
| contd :- -5- transmitted to the wheel at critical speed with the worst tyres. Front of car riding rather harsh owing to excessive rebound loading. 55 lbs. up - 100 down. Slightly more effective anti-wobbler, but car riding at the front definitely harsh. 40 lbs. up - 80 down. Regarded as the best compromise. Still a very effective anti-wobbler, and car sufficiently damped, but harsh riding at low speeds removed. (b) Rear. 18 lbs. up - 100 down. Back of car does not hold the road well on a bad surface, causing steering to wander. Objectionable kick in the small of the back in the front seats. 60 lbs. up - 100 down. Road holding vastly improved, but kick in the back still present. 60 lbs. up - 80 down. Best all round results for high speeds on Continental roads. Upward setting probably rather too great for British conditions. General road holding with 6.2" or 6.75" tyres very good. Steering selectiveness with 1500 lbs. side steering tube springs, quite satisfactory as long as rear tyre pressures are kept up. Vl.{V. Lewis / Mr Valentine} S.S. TUBE ARRANGEMENT WITH MICHELIN 6.2" OR DUNLOP 6.75" TYRES. (a) Std. arrgt. with various spring ratings. 2000 lbs. There is no doubt that without an unpleasant amount of friction in the steering, causing lack of selectiveness and sluggish self-centering, these springs do transmit objectionable road shocks to the wheel at high speeds, and joggles at low speeds. From an examination of the springs contd :- | ||