[python] Re: Self Centering vs. Wheel Flop

Hi Stephan,


Stephan Schöling wrote:
> Hej Dirk,
>
> please, can you explain why you see a system with two weightpoints ?
> I only see the Center of Gravity (CoG) and can´t understand why the BB
> should be important.
Well it is only to model the weight of the bicycle and the weight of the
rider. Some of it is on the front part and some of it is on the rear
part. It is not enough to concentrate everthing in the CoG, because the
bicycle is devided at the pivot. I proposed the CoG and the BB because
that is easiest to guess or measure how the weight is distributed.
>
> Now, my way to think is to add some weight in the CoG till the frame
> stabilizes.
Yes but the model is artifically, you need explicitly add a weight to
the front part otherwise there will not be any wheel flop.
> Then i add the riders weight minus the weight i added before for
> stabilization. Now i have the weight that  produces the
> Self-Centering-Force (Stabilization-Force).
> If i loose weight  (e.g. loss of gravity because of a deep pothole ;-)
> ) i loose stabilization force. (   %  <-- sign for "python crashed" ?)
A very very deep pothole. Sounds more like a cliff to me ;-)
> I hope i am right, when i assume, that it doesn't matter where the
> rider is placed and where the points are, which transfer the forces to
> the frame as long as i know where the CoG is.
> What is missing in my system ?
>
> Cheers,
>   Stephan
>
> (BTW, i see us sitting in a pub discussing all that
> flop/effect/force/gravity-stuff and the guys next to us wondering
> about how worse things alcohol can cause ...)
who knows may be we will once? :-D

groetjes,
Dirk
>
> dirk.bonne@xxxxxxx wrote:
>>> Yes, Probably better not to give the wheel weight but some extra block
>>> about where the BB is located. There should be two weightpoints: BB and
>>> where the seat is.
>>>
>>> Only the distribution (verhältnis) of these weights, and not the
>>> absolute weight should be important though.
>>>
>>> Pitty also that the engine cannot do a torus, for the wheels.
>>>     
>
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