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Turning
As stated a few times, but is worth stating again, turning at a decent speed while holding the goal (and while having decent traction against being pushed sidways) is the real design challenge.
The wonder wheels (wheel with side rollers offering side motion as well as the wheels rolling) worked pretty well last year for some, but this leaves you very vunerable to being pushed sideways.
It will be interesting to see what people come up with.
Scott358
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