[python] Re: Vedr.: Sketches of four-bar-linkage design

Thanks Michael,
your drawings are very inspirating!

> what is the purpose, or the gain, of the
> four-bar-linkage design?

4bl could be a solution for the main problems
of all center-steered lowracer constructions by
generating a virtual pivot with positive trail.

If you want positive trail with a normal pivot,
the steering angle has to be very flat, resulting in
gigantic turning diameters and unacceptable
wheel flop.

I tried the negative trail with the python, to avoid
this. The result is surprisingly satisfying,
but downhills with speed above 50 km/h I miss the
safe feeling of a bike with positive trail.

> PS: I'll try not to post too much about this bike to
> this list, because it is not actually a python, although
> the frame is quite similiar.

I do not consider this off-topic as it might help to
improve the python. This list is full of creative people
who like to make new recumbent experiments and it
is great that everyone shares his ideas.

I will build a small scale model of your 4bl lowracer
in the next days and will try to figure out if it might
work.

Regards from Jürgen.

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