Wasn't it Christoph Hormann who wrote:
>
>Looks funny.  How does the underlying topology work?
>

There are just 8 masses, four representing the corners of the body and
one representing each wheel.

There are 6 stiff connections between all possible pairs of body
corners, 4 soft connections vertically downwards from each corner to the
corresponding wheel so that the distance between the car and wheel can
vary, 2 stiff wheel axles, and eight fairly stiff diagonal connections
that try (by don't quite succeed) to prevent the axles moving too much
in horizontal directions.

The body shell is rigid, but the four masses representing the corners
don't always end up in the same plane, so the body shell position and
orientation is calculated from averages.

-- 
Mike Williams
Gentleman of Leisure

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