[Yoda]

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....

Dan,

Thanks so much for this great post and your follow-up above. Your years of experience with Mac is an invaluable resource, especially now when combined with your knowledge of The Golfing Machine.

I have had many students -- amateur and professional -- but none more dedicated to the pursuit of learning and mastery of the teaching craft. It has been my pleasure and privilege to watch your dedicated pursuit over the past 2 1/2 years. Impressive.

And I know you've been "eating your own cooking": Those mid-sixties scores you've been posting lately are getting b-o-r-i-n-g! I think you're getting it!

Proud to have you aboard, Dan, as my friend, student, counselor, and Lynn Blake Certified Senior Instructor. Thanks again for your many contributions to LBG and the benchmark of professionalism you set for us all.