[python] Re: trail vs wheelsize

Thanks JÃrgen and 25hz, i will follow those hints!
Luckily i did not weld on the cross beam of the rearframe so far. This
means i can put in a longer one and get a bigger angle combined with
more ground clearance.

Unfortunately the programm from dirk bonne is for windows, which i don't
use, but i will see what i can do (emulator...) since it is looking
really good :-)

So bigger angle means less wheel flop. But at the same time this means
less self-centering and less steering sensitivity. So if i lean over the
side to steer, i get a smaller steering angle for the same input, which
probably means the bike will be less nervous...hmm sound good :-)

Now the sad thing is, it'll be till christmas when i get back to my
parents place to improve the python...

Dirk

Am Mittwoch, den 11.10.2006, 23:17 -0400 schrieb 25hz:
> Yes sir, Jurgen is exactly right.  I built a python that could adjust the
> wheelbase and pivot angle, and indirectly the seat height.  I posted a
> rather lengthy analysis after the 5 of us were done adjusting and testing.
> http://www.freelists.org/archives/python/10-2005/msg00017.html
> 
> The link to the python is here and I still need to take some photos of the
> finished python.
> http://www.fleettrikes.com/python%202.htm
> 
> | > That is my question: what is the best python setup? I was trying to
> | > do some calculations, much like those on the website. I realised i
> | > need vector math to figure out the up and down travel when
> | > steering... I was thinking to produce an javaapplet, that one can
> | > start in a webbrowser. You enter your measurements, and get i.e. your
> | > up and down travel. I think wheelbase, trail, wheelsize, "the angle"
> | > and the distances between the steering pivot and the axles all have
> | > the influences...
> |
> | Hello Dirk,
> |
> | this program was already made by Dirk Bonnà and you can find it here:
> |
> | http://dirkb.dnsalias.net/pythonselfcenterprogram.html
> |
> |
> | A remark to your prototype:
> | If you build a python with pivot angle of 60 degrees you very
> | likely run into the wheel-flop problem, especially if the front
> | wheel is big.
> | With an angle of 67 degrees you should be on the safe side.
> |
> | > Would it be possible to build a flexible python, where one could
> | > adjust all things that possibly have any influence in the driving
> | > experience? I would then go on and modify them one by one to the
> | > extremes.
> |
> | This has been done by Tim (25hz) last year. There have been discussions
> | in this list and I think there is a report on this site:
> |
> | http://www.fleettrikes.com/python%20clone.htm
> |
> | Regards,
> | JÃrgen.
> 
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