[python] Trapezium steering?

Hi

I have spent all sunday near the Optima site at the exhibition at
CycleVision and suddenly realised a way to reduce the trail of a
Python.

The idea is verry similar to the way the suspension of the (no longer
in production) Optima Cobra. A trapezium has virtual turning axles,
witch in some configurations can be outside the trapezium.

A slight problem is that trapezia have two virtual axles. I started
doing math in oocalculator and found a workable trapezium where both
virtual axles coincide.

The trapezium i found has the following configuration: rear 21, sides
18, front 10, this trapezium gives a virtual pivot 11,4 outside of the
trapezium.

If I would aply this idea to th Jaculus i would reduce trail from
about 20, to aprox. 9.

I hope to give people ideas, since the comming months i won't be able
to construct another python.

I do have the spreadsheet for trapezium calculation, but since
mailinglists don't like attachments, i do not atatch it to this mail.

Milan
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