[python] Pivot Rise vs. Pivot Angle Measurements
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: Python <python@xxxxxxxxxxxxx>
- Date: Sun, 20 Mar 2011 23:34:21 -0700 (PDT)
Surprise, measured data has opposite trend as simulated,
see http://en.openbike.org/images/openbike/9/91/GuineaPigMeasurements.png
The measurement is done with me on the seat, feet on the ground. For
reference,
I also include pivot height at rest (square symbol), linear with pivot angle.
The pivot rise trend seems consistent with the force required to push the
wheel
to ~20deg (self-centering). Looking for a luggage scale pulling on the pedal
to measure the force...
I also rode 20km today, with 20in & 56deg pivot; 3km on the street was a bit
nervous, but calm on the trail, mostly alone. Fell off a few times when
distracted / not focusing, but balance can be maintained with eyes closed :)
Braking does straighten out the bike nicely, but using coaster brake in
emergency is 50/50 chance, depending the pedal position. Off road, loose
gravel, wet dirt / mud surface is very different from dry asphalt; see the
slipper fall >> http://www.youtube.com/watch?v=d6oMNQUdk9A
Vi
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