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The links should be set up to be equal in length. They should also, ideally be set up such that at ride height, the links are parallel and horizontal. However, as the suspension moves up and down from there, the Watts link still works as long as plenty of travel has been designed in.
So in practice, the main thing is to get the links horizontal, parallel, and equal in length at some point in the suspension travel, with the axle level. Moving the pivot up or down from there should still be OK. Now, you should be reasonable about it - don't set up the links with the suspension at full droop, but ....
The so-called "propeller" (aka bellcrank) should probably be vertical somewhere in the ballpark of halfway through the suspension travel just so you maintain plenty of travel. [probably wrong, see below]
It is important that the arms be horizontal when they are parallel (with the axle level), or there will be some unintended lateral movement as the suspension moves vertically.
In practice just set it up with the suspension loaded, the chassis and axle level, the links level and equal in length, and then verify that there is plenty of travel (ie that the in full droop the bellcrank doesn't reach horizontal).
This post has been edited by sgarnett: Jul 24 2008, 10:40 AM
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Watts Link, No joke.....
Jul 17 2008, 11:12 PM
