[python] leverarm forces with 4bl

Hi all,

in the attachment you see the different side forces of python and 4bl-python. 
red are the
forces, yellow are the fixed points.

The leverarm (pivot-hub) and (hub-bb)are the same length, or (pivot-hub) is 
longer than (hub-bb),
the pivot is fixed to the seat and the hub is fixed to the ground, that is why 
the side forces are
balanced.   On the TT this is not so.

On the 4bl-python it could be even worse, because the leverarm (pivot-hub) is 
not fixed but can
rotate to the side. I think the riding feeling could be similar than on my 
first TT prototype with
steering angle of 75 degree.

If I am right, 4bl would not make sense on the python and would make riding 
more difficult.

Jürgen Maier

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