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).
The causes and preventatives for low-speed steering wobbles, page 22.
| Identifier | ExFiles\Box 178\1\ img121 | |
| Date | 13th July 1926 guessed | |
| - 22 - 2. Weak side steering tube springs. 3. Any side steering tube springs with non-reversible steering. 4. Centre point steering. 5. Large section, low inflation pressure tyres. 6. Good non-skid treads. (c) Preventatives. Low speed wobbles are more susceptible to a small amount of friction in the pivots than high speed wobbles. In consequence if the designer can provide means of obtaining some friction in this position, and at the same time induce the steering to self-centre with this friction and a small castoring angle, the chances of low speed wobbles will be reduced. The designer may also endeavour to provide against road shock by making the steering semi-reversible, so that weak buffer springs in the side steering tube are not relied upon, as these tend to promote low speed wobbles. The means available for curing a car suffering from low speed wobbles are as follows:- (1) Ensure that the castoring angle of the front pivots does not exceed 1° backwards. If it does the pivots should be restored to the correct lean of 1° by means of wedges fitted between the spring and the axle. (2) Ensure that there is no slack in the steering system, that the side steering tube springs are not broken, and that they are the strongest recommended. contd. | ||