I suspect non-zero caster would create what's called roll steer in the
rear suspension. This was experimented with in the 50's, maybe 60's,
but is now considered a *bad* thing. If the radius arms are the same
length, it's probably to eliminate roll steer.
Brian Evans wrote:
> My Merlyn sports racer has the typical small formula car rear suspension
> setup. It has twin parallel trailing arms, reversed lower A-arm, and upper
> link. my question is what effect will castor of the suspension upright have
> on handling?
> You can measure the castor by putting a level on the outer part of the lower
> A-arm. You can adjust it by changing the relative lengths of the trailing
> arms. Any clue as to what positive or negative castor will do to the
> handling? A setup guide for the Merlyn Mk11 suggest setting it to zero, but
> why?
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