[python] Re: getting a gauge
- From: matthias <matthiaspeter.nowak@xxxxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Sat, 20 Mar 2010 09:16:34 +0100
Peter Davis wrote:
I am bouncing around the idea of building a hand cranked
version of the python. as there is no need to steer per se. the crank
arm could be used as a kind of a tiller. as i have not as of yet built
or even riden a python I am tossing out the idea to you all in an
attempt to gauge the feasibility. first off i was thinking synchronized
cranks so as to avoid "wobble" while pedaling, more of a rowing motion
than a pedaling. anyways what do you all think? is it do able? will it
be ride able?
Dear Peter,
my idea why the python is somewhat stable despite the negative trail, is
based on the force from the legs. David E.H. Jones has an example (URB
IV) that is unstable because of negative trail. But applying a force
(centering force by Dirk Bonnie) will make it stable again.
That means, when you row your bike: pushing will make it stable, but
pulling will make it unstable. And pulling is far more forceful.
If you have positive trail, then the opposite applies.
I have seen wheelchairs in old east germany, where there was some kind
of rowing scheme involved. However steering was done by twisting the
handles. Some bowden-track related this twist to the steering wheel.
However, here are we talking about a tricycle, albeit a fast one.
with best regards Matthias
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