[fladan]

Lynn asked me to reply to the general discussion regarding CP (centripetal force)
and CF (centrifugal force) motions per Mac O'Grady. Here goes:

By way of explanation, I "managed" Mac's schools for six and half years (2001 - 2008 ). I attended over 30 schools and was part of the teaching team for these schools. I was also, at the time, one of two people allowed to use the MORAD
logo for my teaching.

CF motion uses a lateral shift of the hips beginning the downswing, with the left arm angled about 20 degrees inside to the target line at the point the left arm is parallel to the ground (know as Position 5). The right elbow moves toward the right hip. Then the right arm begins to straighten when the club is parallel to the ground (P6). The hips "elevate" to impact. Flight of the ball is predominantly a push to push/fade, although any flight is possible via club face position. Generally, it is always a higher flight than a CP motion.

A CP motion is an outward force - the rotation of the left shoulder is more level to the ground - horizontal (Mac believes the left shoulder position is monitored, not the right shoulder). The hands are brought predominantly outward, rather than moving downward, and the left arm is parallel to the target line at P5 (see above). This rotational motion is continued through impact. This motion produces a lower trajectory, and a left to right ball flight (generally).

I can tell you that a CP motion is a body driven motion - very little to no shifting of the hips, and a lower finish vs. the CF finish.

The key point with regard to other posts is that both motions are body and/or left arm driven - the right arm is not flimsy, but does not play a major role in either swing model.

At least according to Mac....