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).
Analysis of vehicle wobble observed on the road and on smooth drums using a stroboscope.
| Identifier | ExFiles\Box 170\3\ img039 | |
| Date | 14th July 1933 guessed | |
| -9- Above is a picture of wobble as we have observed it on the road and on smooth drums. We have used a stroboscope to observe the wobble at 360 per minute which we get on the TI and Chevrolet Master and have also (by disconnecting the drag link) produced an artificial "extra low speed" wobble at 190 per minute which has the same general form. The car is drawn without springs since actually these play a small part, the tires taking the greater part of the deflection. It follows that the type of suspension makes very little difference (which appears to be so from our tests). The only qualification of this is that increased inertia around the kingpin certainly affects wobble. The cycle of operations appears to be as follows:- Wheels. At A' the wheels have swung maximum left. At B' the wheels point straight ahead. At C' the wheels have swung maximum right. At D' the wheels point straight ahead. Car At A the car is central and horizontal, swinging off to the left, about the axis shown. At B the car has swung maximum left. The right wheel is pushed down on the road and the left front wheel is slightly lifted. At C the car is central and horizontal, swinging to the right. At D the car has swung maximum right. The left front wheel is pushed down on the road and the right front wheel is slightly lifted. Note in terms of a spot at the end of the right front wheel, the travel, as described above will be :- | ||