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).
Comparison table of suspension characteristics and roll rates for standard versus modified front spring setups.
| Identifier | ExFiles\Box 124\4\ scan0028 | |
| Date | 17th July 1941 | |
| Rm{William Robotham - Chief Engineer}/GB.2/T.17.7.41 - 3 - With standard suspension. With modified front springs. Without front anti-roll bar. With front anti-roll bar. Rear spring rate measured. 149 lb/inch. Estimated rear suspension rate. 175 lb/inch. Measured friction rear spring only. 55 lbs. Virtual deflection of rear suspension, less tyres. 3.24° Rear suspension roll rate, less effects due to spring torsion. 156 lb.ft/deg. Expected rear suspension roll rate. 234 lb.ft/deg. Rear tyre rate. 1100 lb/inch Rear track. 45" Rear tyre roll rate. 1620 lb.ft/deg. Overall rear roll rate. 204 lb.ft/deg. Total overall roll rate. 323 lb.ft/deg. 265.5 lb.ft/deg 408 lb.ft/deg. Rolling weight. 1960 lb. Rollrate per 2000 lbs. 330 lb.ft/deg. 271 lb.ft/deg. 416 lb.ft/deg. Percentage of roll couple on front wheels 37% 23% 50% rear " 63% 77% 50% Rm{William Robotham - Chief Engineer}/GB. | ||