Thanks Eldon. I have looked at your Piranha pages so many times that
I consider it to be a "Kart Bible". I understand what you mean about
the asymmetrical a-arms. Thanks again,
Aaron




--- In offroadgokarts@yahoogroups.com, "Eldon R. Hiebert"
<ehiebert@y...> wrote:
> On offroad buggies body roll is not a significant problem. Why?
because all of the weight in a 1-seater rig is mostly in the
centerline of the buggy. Also, the suspension mounting tends to
outside of the mass width of the kart. The biggest reason why body
roll is small is that roll is much more a significant problem for
vehicles with a high traction coefficient and where large cornering
forces are present. A buggy by its very nature is driven in a low
traction environment.
>
> That is not to say the body doesn't roll in a corner, because it
does. But good suspension designs should take into account the body
roll condition and allow for progressive camber change to ensure the
wheels don't go heavily into positive camber.
>
> This is done with a double wishbone by using asymmetrical a-arm
designs. Essentially the upper a-arm is shorter than the lower, and
swings through a tighter arc. That way, the wheels get negative
camber on both heavy compression and heavy dip of the suspension. If
you design carefully you can nearly eliminate the sidewall scrub that
occurrs as the suspension moves through its extents of travel. This
occurs when tangent offset distance plus the camber change distance
of the top and bottom of the wheel equal the tangent offset of the a-
arm. Hmmm..... I could explain this better with pictures.
>
> Eldon.
>
> fleshstabber <fleshstabber@y...> wrote:
> I'm building an off-road kart with a 100hp rotax engine.
> Obviously it will be able to reach extremely high speeds. I'm
> worried that, under high speed cornering, I will have excess body
> roll. I'm putting double wishbone suspension on the front and
rear.
> Has anyone ever experienced this kind of problem and is a
stabalizer
> a good idea? I know that it will limit the amount of travel for
the
> A-arms but is it necessary or am I just over thinking things? I've
> never seen one on any karts before but that doesn't mean that it
> wouldn't be helpfull. If anyone has pros or cons for me, please
let
> me know. Thanks, Aaron.
>
>
>
>
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