Posted by: tom.guerry (tom.guerry@kp.org) on Fri Dec 19 13:50:01 2008

Shawn -

The biggest source of timing error is picking a matching motor program that has the right
duration from launch to contact. The duration error is minimized by the optimal blend of a
short bathead path from launch to contact traversed as quickly as possible. In a ballistic
motion, deceleration is forced the instant the connection CHP/pendulum connection is
lost. This results in large timing error and loss of consistency. Good timing with minimal
error is when max speed/escape velocity is right at contact, better just before than after.

A non expert swing tends to get the segment sequencing out of order so that there is
deceleration/reacceleration instead of steady acceleration/summation of velocity. Arms
get in way and accelerate before torso. Result is clubheaqd decel before impact,see her for
golf, but same for hitting:

http://www.advancedmotionmeasurement.com/Articles/KinematicSequence-
TransitionandDownswing.pdf