[python] Re: Lean disturbances
- From: Jürgen Mages <jmages@xxxxxx>
- To: <python@xxxxxxxxxxxxx>
- Date: Sun, 27 Feb 2005 16:56:09 +0100
Hello Eric,
When one rides a Python-style bike, how does one maintain stability when
the
lean angle is perturbed (e.g. by a crosswind pushing you a few degrees to
one
side)?
IMO, this is primarily due to the reflexive responses of the Python's
rider.
I think you are right. As the python does not have a resonant intrinsic
steering behaviour like normal positive trail bikes, perturbances have
to be managed by the rider himself.
This is hard in the beginning of the learning phase, but it gets easier
because
the cerebellum learns how to react with reflexes. This is done
automatically. Imagine yourself walking or running and stumbling by
perturbance: the body responses will compensate this.
One might think that riding the python for hours is exhausting, but this
is not the case. After my 160 km day trip I was way more relaxed than
I would have been after travelling with my trekking bike.
1) hanging-pendulum
2) pulling of front wheel forward by drive torque
3) pushing of front wheel forward by rider's legs
4) gyroscopic effect of spinning wheels
These effects all induce stability.
While pedalling a front wheel driven bike, negative trail induces more
stabitily than positive trail, resulting in less perturbances.
Problems arise when coasting downhill with high speed.
Cheers,
Jürgen.
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