[python] Re: Stability on coasting

  • From: Jürgen Mages <jmages@xxxxxx>
  • To: <python@xxxxxxxxxxxxx>
  • Date: Mon, 13 Feb 2006 17:32:31 +0100

Hello Tom,

I was thinking
about the stability issue when coasting downhill, and it occurs
to me that this is similar to the problem of a tractor + semi-trailer
combination which wants to jackknife in the right (actually wrong!)
conditions. Like the Python, there is a pivot (with 90 degree angle),
drive is on the component forward of the pivot, and the weight is
distributed between the forward wheels (through the 5th wheel
pivot) and the trailer wheels. As long as the tractor is pulling the
trailer, there is no problem, but when trying to brake the system
can fold up.

Interesting thoughts and indeed there are some similarities. So thanks for this new idea.

Btw the python pivot is around 65 degrees and not 90, which
makes a difference (self centering etc.). But right, as long as
the front wheel is pulling the bike, there are no problems.

I never experienced jack-kniving or the merest hint of it, even
when braking hard on the front wheel, when rolling fast down-
hills. So I don´t know if it really is an issue.

Referring to the spooky feeling at 50+ km/h coasting speed, we
have not found a solution yet, but always welcome new thoughts.

Cheers,
Jürgen.

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