[python] Jetrike Geometry
- From: Henry Thomas <whpthomas@xxxxxxxxx>
- To: Michael Moore <mmoore2@xxxxxxxxxxxxxxxx>, Rick Wianecki <rwianecki@xxxxxxxxxxx>, Python List <python@xxxxxxxxxxxxx>
- Date: Mon, 26 Feb 2007 22:20:57 +1000
Hi all,
For those who contacted me from the list now undertaking Jetrike
projects, please find my latest recommended geometry for Jetrike designs at
http://jetrike.com/geometry/Recommended-Geometry.pdf
This is also available from my updated geometry page.
http://jetrike.com/geometry.html
There are three variations, a Lowracer, one with a higher less reclined
seat and one with a narrow track, as per requests. I feel pretty
confident with these sets of geometry, but as always this is an
experimental design.
From all of the testing I have done on my existing trike, I can confirm
that the self-center does work, really well actually. But I am now
convinced it favors a drive train like the Python with negative trail.
The current positive trail design has to be carefully balanced by
ensuring the steering is dead center. This is because the contact patch
of the turning front wheel alters the balance fulcrum, and if turned
much from dead center will tip the trike. I am pretty certain that
negative trail will correct this and hopefully create a setup that is
easier balanced.
I have a much better understanding of the interplay of the different
angles in the geometry, and it is surprising how well it works. Helping
to center when centered and helping to lean when leaning. Still I don't
know yet what the high speed stability will be like, but that will come.
I am working on a short video -- which I will post on youtube when its
done -- burnt up way too much bandwidth on the last ones :-)
-h
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