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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 nature of high speed wheel wobble or wheel tramping, including diagrams.

Identifier  ExFiles\Box 178\1\  img114
Date  13th July 1926 guessed
  
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In other words, the left-hand lock requires about 33% more effort than the right-hand lock. A consideration of Graph III will shew why this is, the leverage available falling off considerably on the left-hand lock.

IV HIGH SPEED WOBBLE, OR WHEEL TRAMPING.

(a) The nature of the high speed wobbles.

High speed wobbles have recently come into prominence as a steering problem. They are quite separate and distinct from low speed wobbles. When a high speed wobble takes place the whole axle vibrates in a criss-cross manner.

In a mild wobble each spring is compressed and extended in turn. In a violent wobble each wheel completely leaves the ground in turn. Each wheel when it hits the ground is turned inwards - when it leaves the ground it is turned outwards. The track of a high speed wobble on a tarmac road is like this:-

DIRECTION OF MOTION
X

We have measured distances X. as great as 10 ft. after particularly violent tramping.

contd.
  
  


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