[python] Re: Unstable ride
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Thu, 28 Jul 2011 11:33:02 -0700 (PDT)
The pole and camera are only ~2 lbs, which I can hold with my hand & arm and
are quite a workout after a while (full body exercise?). An elbow brace/strap
would help.
Yes, the wobbling is mostly from loose mount / flexing, but the camera is high
enough(10 ft) to change the lean angle of the bike. Yes, I do need the whole
street for the experiment like when I first learn to ride, which leads me to
consider the setup in advanced / accelerated training. Does it simulate sudden
lost of control? Can it amplify or counteract pedal/steering interference?
Chaotic double pendulum? http://en.wikipedia.org/wiki/Double_pendulum.
So far, riding more difficult configurations makes me appreciate easier ones,
but not sure of what aspects of the improvement...
Vi
>________________________________
>From: Dirk Bonné <dirk.bonne@xxxxxxx>
>To: python@xxxxxxxxxxxxx
>Sent: Thursday, July 28, 2011 12:47 AM
>Subject: [python] Re: Unstable ride
>
>
> Yes, flexing is bad. I had a hilarious time once, transporting a cabinet on a
> one-wheeled trailer on my flevo. Both flevo and homebuilt trailer had a lot
> of flex. I needed the whole road for balancing; people were staring in
> amazement...
>
>OTOH, If the frame and connections are stiff, then there is no
problem: On the pythoon there is now a strong luggage rack over the
rear wheel. Even with my son in the box and a weeks worth of
shopping on the rack the feel of the ride is changed in only minor
way.
>
>The cog on Vi's ride cannot have changed much with that pole, as the
weight isn't that high (Vi is able to hold tahat same pole
horizontally on another video).
>
>DirkB
>
>On 28.07.2011 07:43, dirk@xxxxxxxxxx wrote:
> Hi Vi,
>>
>>might the reason be your heavy weight camera extension, that shifts the cog
>>far to high?
>>if that rod is flexing due to its length, it might be counteracting your
>>cycling....
>>
>>greetings,
>>DirkS
>>
>>
>>Vi Vuong <vi_vuong@xxxxxxxxx> hat am 27. Juli 2011 um 18:09 geschrieben:
>>
>>> While videoing the top view of Guinea Pig, I stumbled on a
really unstable dynamics mode, sort of an inverted pendulum
(10-foot + tripod head, compact
camera) http://www.youtube.com/watch?v=_SAaxS2_LwI. It feels like gust
wind blasting from all direction...
>>>
>>> The motion calms down later as I got a hang of it, seems to
be controllable if it sinks with the pedaling / python motion.
Let me know if anyone is interested in a more systematic study.
>>>
>>> Vi
>>
>>http://dirk.steuwer.de
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