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).
Experiments on measuring frame twist and torsional stiffness in vehicle chassis.
| Identifier | ExFiles\Box 17\3\ Scan194 | |
| Date | 9th March 1928 guessed | |
| contd :- -2- the steering wheel to a more serious extent on the sports than on the standard car. This experiment takes no account of the column 'dithering' due to insufficient support, but was merely intended to measure the static effect of frame twist. (2) Frame twist. We attempted to obtain direct comparisons of the torsional stiffness of the frames by twisting complete chassis. This was done by jacking up the front wheels to fixed heights alternately with all spring unblocked and measuring the actual twist in the frame, apart from the movement in the springs. The results obtained were very inconsistent, and did not enable conclusions to be drawn. We attribute this to the varying effects of the internal friction in the complete chassis, both from time to time and from car to car. We were more successful with some measurements to shew distribution of twist along the frame, expressed as a percentage of the total observed twist. We tried to find out if the rubber engine feet reduced the torsional stiffness of the front part of the frame. These tests were done with the springs blocked, and the wheels jacked up as before. [Diagram showing a rectangular frame] FRONT A B C 138'' 89'' | ||