Posted by: tom.guerry (tom.guerry@kp.org) on Tue Jan 6 10:13:17 2009

Al-

An interesting thing to do to start to answer or refine your questions is to look at simulations. here are a few that can help you get a feel for the possibilities:

http://www.maths.tcd.ie/~plynch/SwingingSpring/doublependulum.html

thuis is a simple double pendulum simulation where the central/proximal/first pendulum would be analagous to the lead arm connected tightly to a turning torso mass and the second/distal/peripheral pendulum woud be the bat connected by a passive hinge analagous to the wrist.

This simulation lets you trace the path of the bathead and change the mass and length of the levers/pendula.

here are some simulations by Nyman which resemble a hitter more.

These are very good simulations, but his interpretations and applications derived fromt them are lacking:

http://www.setpro.com/stuff/rotational_simulation4.wmv

http://www.setpro.com/stuff/rotational_simulation5.wmv

http://www.setpro.com/stuff/rotational_simulation6.wmv