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).
Test report detailing the effects of drag link and front rubber adjustments on steering wobble.
| Identifier | ExFiles\Box 170\3\ img055 | |
| Date | 20th June 1935 guessed | |
| -3- With 1/2 turn slack in the drag link there was a slight wobble tendency. With 3 turns slack in the drag link there was a violent wobble. 4. Tightened up the front rubbers 4 turns. With 1/2 turn slack in the drag link there was a slight wobble. With 3 turns slack in the drag link there was a violent wobble. 5. 6 turns tight and 10 turns tight gave the same results. 6. With drag link 3 turns slack the front rubbers were slackened :- Rubbers just nipping produced a violent wobble. . 4 turns back . . . 6 " " . . . 8 " " no wobble. It is therefore necessary to have adequate free movement of the engine and a sufficiently soft mount to give a frequency of about 320 on the supports in order to stop the wobble when frictionless kingpins are used. The wobbling had loosened up the steering gear and the performance on return was not as good as going out, there was a noticeable tendency to 'nibble' even with 1/2 slack in the drag link. C. Since this is obviously harmonic action, that amount of damping is important. A damper was rigged up thus :- | ||