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Old 12-14-2006, 04:04 PM   #66
Erick Mead
 
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Dojo: Big Green Drum (W. Florida Aikikai)
Location: West Florida
Join Date: Jun 2005
Posts: 2,499
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Re: How to teach and train relaxation

Quote:
David Knowlton wrote:
My problem with the chain analogy is this: have you ever tried to push a chain? Don't work.
Yes you can. See Coulomb's memoir on statics, and the picture I gave you. in an earlier post It works in only one shape, the chain has to be relatively rigid in compression (like the spheres or my limbs) but need not have any cohesion or bending resistance at any joint ( like my relaxed limbs). And the chain has to want to be pushed, i.e -- be adaptive, or "smart" to maintain that super critical shape. Nobody ever said kokyu just "happens."

The shape is super-critically stable and therefore it requires continual adaptive adjustment to maintain it. That is why kokyu as martial expression is so difficult for an enemy to counter, it is so variable and adaptively unstable that he can never find his line.

Quote:
David Knowlton wrote:
Catenary arch is lovely, describes the arch of my foot perhaps - but you are missing the point of balanced tension and compression - in a vertical pole tied down with three or four lines for example. That's a better description of what makes us stand up - look at this picture: http://wwwhome.cs.utwente.nl/~jagers...tensegrity.jpg
Nah -- try a top-heavy wobbly pole with a double eccentirc and torsional elastic joint stuck in the middle to alter the eccentircity of the toppling moment. Balancing THAT nifty bent broom stick is what keeps us upright.

Spine = tensegrity. Amen, brother.

But the mechanics of kokyu are not explained by that fasincating model of static structure. The "smart" chain does. Tensegrity does not explain either the tegatana shape as a critical element of kokyu or its flip side of Hiji-riki. The "smart" chain does.

Cordially,

Erick Mead
一隻狗可久里馬房但他也不是馬的.
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