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).
Report page detailing vehicle suspension and handling characteristics, including ride rates, roll rates, and tyre pressures.
| Identifier | ExFiles\Box 127\4\ scan0221 | |
| Date | 2nd July 1940 | |
| -2- Section IV. Measured average rear ride rate lb/inch Measured friction. lb. Suspension rate. lb/inch. Virtual deflection. inches. Section V.{VIENNA} Measured rear roll rate. lb.ft/deg. Tyre roll rate. lb.ft/deg. Suspension roll rate. lb.ft/deg. Calculated suspension roll rate. lb.ft/deg. Stiffening due to spring torsion. % Section VI. Total roll rate with tyres and anti-roll bar. lb.ft/deg. Rolling weight. lb. Roll rate per 2,000 lb.rolling w't. lb.ft/deg. Distribution front % rear % NOTES. Section 1. Tyre Pressures. Normally those used will be the recommended pressures. Where the ride rate changes considerably with change of ride position as on the Vauxhall front suspension more accurate results can be obtained by increasing the tyre pressure to 30 lb./sq.inch where it is normally less than this. Four Passenger sprung weight. This is obtained by adding 600 lb. to the kerb weight and subtracting the unsprung weight. G.M. used to assume that the passengers added 150 lb. to the front axle weight and 450 lb. to the rear. This assumption was dropped at Vauxhall when found to be untrue. The figures for Vauxhall 10, 12 and 14 H.P. cars are 180 lb. front and 420 rear. The figures were found be sitting four 150 lb. people in the car. Two thirds the weight of the conventional rear spring is counted as unsprung. Section II. The linear measurements for the ride rate are taken from stickers on the wings in the plane of the front wheels to the scale platform. The suspension ride rate = (front ride rate x tyre rate) / (tyre rate - front ride rate) The tyre rate is taken from a chart. The Virtual deflection = (4 passenger sprung weight) / (suspension rate at 4 passenger load) Continued. | ||