[python] Re: Trapezium steering?

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.

GIF image

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