[python] Re: another newcomer
- From: Jürgen Mages <jmages@xxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 19 Jan 2007 12:46:24 +0100
Hello Thomas and welcome to the list,
Maybe you could help me in a few questions:
What is the significance of the BB/seat
difference? Does it have any impact on stability
/ centering? Or is it more about the comfort and
related to the seat angle? In principle, 20''
wheels would allow the BB to be lower than the
seat. I have not been able to find such examples.
But the values in Jürgen's project survey rank
from 5 to 29,5 cm.
Very low BB height might cause your pedals hit the
ground when cornering. Also it is less efficient
if you prefer the sportive riding.
Very high BB seems to increase wheel flop and pedal
induced steering. Als it might be annoying having
the feet in the view.
Take 20 cm and it will be fine.
I am considering a construction, where the pivot
angle is adjustable. At the same time, it could
also be linked to shock absorption. In that way,
it will have to be adjusted to the weight of the
rider to have a kind of resting position. But the
pivot angle will then still (again depending on
the features of the shock absorber - should
certainly be rather stiff) be under constant
change. Compressing the absorber would reduce the
pivot angle and consequently the negative trail
and vice versa. Has anybody experience with that?
Would that kick the rider off the bike? Do you
have any idea how this would affect stirring
dynamics? Or shall I make the test? J
Be the test subject for us and tell us what you
found out. So far no one dared to make front
suspension. Any pictures of your construction plans?
The last question for now: The wheels base! I
understand that the wheelbase will influence the
self-centering effect. But apparently much less
than the pivot angle. So, is there any limit for
the wheelbase in any direction? And why?
Not really much influence of the WB on selfcentering.
Determine how your body fits within the two wheels and
this will give you the correct WB. The longer the WB,
the bigger the turning circle. The shorter the WB the
less traction you have on the front wheel.
Keep us updated ...
Jürgen.
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