[python] Re: Trapezium steering?

I think I found at least one of vythons problems, The two virtual
pivots don't coincide, There is a difference of 6.3 mm. I guess this
will have a similar efect as a bad alignement.

I do not know what you mean by tom trailor like.

Wheel flop is not a problem of the Jaculus. The problem is the high
speed stability, there is no difference between that stability when
i'm peddaling or when i'm not

Milan

PS. i can actually ride my python in trafic, at decent speed now.

2007/6/6, Jürgen Mages <jmages@xxxxxx>:

Gooday Milan,

Congratulations - you just reinvented the virtual steering axis python
that was big in this list around 3 years ago. We called it "The Vython"
and Michael Rienstra even built a prototype. Corresponding threads about
the vython and the four-bar-linkage-system may be found around this posting:

http://www.freelists.org/archives/python/09-2004/msg00021.html

The prototype failed in various ways: First the four pivots were heavy
and had plenty of play. Second the rider could not ride it, because he
had no python experience at all. And third we came to the conclusion
that by shifting the pivot virtually to the front it moves into a
Tom-Trailor-like position which leads to pedal induced steering. So the
project was abandoned. Some months later Laurent Dechenne tried a
similar but more complicated version (see attached picture) which also
failed.

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

If you have problems riding the Jaculus, I would blame it to the 62
degrees pivot angle rather than to the trail. Raise the angle to 65
degrees and the wheel-flop will disappear.

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

Attachments are possible if the posting doesn't grow bigger than 150 KB.

Cheers,
Jürgen.



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