[python] Re: Unstable ride

  • From: Dirk Bonné <dirk.bonne@xxxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Thu, 28 Jul 2011 09:47:32 +0200

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).


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....





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


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