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Re: rear susp alignment

To: Vintage Race <vintage-race@autox.team.net>
Subject: Re: rear susp alignment
From: Simon Favre <simon@mondes.com>
Date: Wed, 03 Mar 1999 10:01:34 -0800
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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