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 discussing the function and failings of auxiliary spring devices, comparing proprietary examples.
| Identifier | ExFiles\Box 28\1\ Scan080 | |
| Date | 22th June 1926 | |
| -3- it enables the car to ride more smoothly over small obstructions at low speeds. For large spring deflections, the coil spring comes choc-a-bloc and the main spring functions in a normal manner. The obvious failing in this device is that it cannot operate successfully under widely varying loads. If the auxiliary spring is to be sufficiently weak to be really worth fitting, a few extra passengers in the car will bring it choc-a-bloc and it will cease to function. If it is given a large travel to obviate this, the frame will be raised appreciably when lightly loaded, and the car is likely to roll badly on corners. In any case, such a device is liable to promote unsteadiness when braking and introduces a potential source of squeaks and rattles. The J.M. is perhaps the best known proprietary accessory of this type; the Thompson introduces a hydraulic cushion to come into operation as the coil spring nears the choc-a-bloc position. J.M. THOMPSON Others of the same type are the Hobson, Hassler and Russell. Contd. | ||