Re: (TFT) Re: fST, Baseball, and other eddies in the stream of consciousness

[raito@raito.com]

Quoting Mark Tapley <mtapley@swri.edu>:
> >A katana blade was about 3.5 feet long, with the sharp portion of
> >the blade being the last 6 inches. 
> >That's about 13 Scale-squares or moments long. 
> >2 + 2 damage?
> >But the "sweet spot" is at the end. 

Most period katana blades are on the order of 28" long, and sharpened 
along the entire length. It's gets hard to actually estimate the 
correct weight of the katana (a civil weapon) and the tachi (a 
nearly-identical military weapon) because the Japanese tradition is to 
keep polishing them, and it's very obvious from metallographic 
inspection that some of the oldest blades have been repolished enough 
that they've lost considerable mass. 

> 	"sweet spot" can actually be defined pretty well using
> dynamics. It's the point where if an impulsive increment of momentum
> is delivered to a bat, the bat's motion about its center of rotation
> is slowed but no net torque *other* that that is applied to the bat
> (so it doesn't "jump" in the hands of the batter). It depends on the

Look up Center of Percussion. A simple rod held near an end has a 
Center of Percussion at the corresponding distance from the other end. 

Neil Gilmore
raito@raito.com
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