I just zoomed through a couple of Smith's books and didn't find a mention of
rear castor effects.
First I thought this would introduce some toe-in change as the wheel moved up
and down, now I'm not sure and realize the upper and lower radius tubes are
probably different lengths and may introduce a castor change themselves just to
make this more complicated.
Good question, have you measured bumpsteer to see if this occurs? and then with
castor changes?
I always aligned to zero castor, and 1/2 shafts at 90 degrees to the gearbox on
my Winklemann FF.
Mike Henry
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?
>
> Brian
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