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).
Technical discussion on the effects of steering at high speeds and road shocks caused by out-of-balance wheels.
| Identifier | ExFiles\Box 178\1\ img127 | |
| Date | 13th July 1926 guessed | |
| - 28 - These various designs indicate that the danger we have mentioned is widely appreciated in the automobile world. A point in connection with this subject is that the effect of steering taking charge at high speeds when cornering is also due to the pivots taking a forward lean even though no front brakes are applied. This occurs when a very sudden turn is made with very flexible front springs. Owing to the mass of the car wishing to continue its motion in a straight line, the wheels momentarily have a tendency to skid, in fact they will skid if the experiment is carried out on a greasy road. This is sufficient to twist the springs and lean the pivots forward. VII ROAD SHOCKS ON THE STEERING WHEEL. (a) Out of balance wheels. One of the most common causes of road shocks felt by the driver is out of balance wheels. An out of balance force in the rim of the wheel even in centre-point steering has a very definite turning moment about the pivot (or king-pin). As will be observed in the sketch, when the out of balance force is in the horizontal plane drawn through the hub, its turning moment is exerted at a distance X. from the pivot pin, once per revolution trying to turn the wheel in, and once out. In our own cars the distance X. is about 2". One contd. | ||