Because when you hit a bump with that wheel, or even heel the car over in a
turn, the curved spring flexes and gets straighter or even more curved,
depending on which way it's moving. This causes the effective distance between
the axle mount-to-spring and the front spring mount-to-body/frame to change.
If the bump did not affect both rear wheels the same then one end of the axle
will move fore/aft more than the other and impart a steering effect on the rear
of the car.
Also works to a limited extent on swing-arm suspensions.
Ed in NC
per Gary...
>>Why is that?
>>
>>- ----- Original Message -----
>>> Stability of solid axles w/leaf springs on rough surfaces is >>>greatly
>affected by how much curvature is in the leaf springs, >>>especially ahead of
>the axle, and where along the length of the >>>spring the axle is mounted.
--
Ed Conen - Raleigh NC
"I purr, therefore I am."
--
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