[Jeff]

Yoda - you wrote-: "This lag pressure point Pressure (1-L #7) is driving the club."

The Lag Pressure Point Pressure is the result of Centrifugal Force transmitted through Pressure Point #3."

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I certainly don't understand your viewpoint.

I believe that CF only comes into play in earnest when PA#2 passively releases (left wrist uncocks passively), and the club releases.

In a swinger the club is loaded against PP#3 at the end-backswing - when the clubshaft is parallel to the ball-target line. At that time point, the only pressure felt at PP#3 is due the weight of the club. Then, during the early downswing, the left hand is pulling the club down to the ball (while the left arm is kept loaded against PP#4 via the pivot-drive). Under those conditions, the sense of lag pressure felt at PP#3 increases because the clubhead has inertia and resists following the hands - it "feels" like one is leaving the club at the top while the entire power package is being pulled down intact to waist level via the lower body shift movement. I don't believe that there is any CF in play during the early downswing because the hands are moving along the straight line portion of the U-shaped hand arc. If the hands are moving more-or-less in a straight line, then there is no centripetal acceleration of the hands, and therefore no need for a counterforce (a CF). During this phase of the swing, I cannot understand how CF can be driving the club via lag pressure at PP#3.

Then, when the hands move around the rounded curve of the U-shaped hand arc, the hands are moving in a circular arc that has a small radius. If the hands are tracking along a hand arc of small radius then the hands are traveling at an acute angle relative to the COG of the clubshaft and that induces the clubshaft to release with great speed (and this represents the CF release phenomenon). The clubshaft releases because it develops angular velocity, and the angular velocity is acquired because the direction of the pulling force at the grip end of the club is at angle to the COG of the club.

nmgolfer explains the release phenomenon in his html document.

See - http://perfectgolfswingreview.net/Ne...%20Science.htm

From the delivery position (3rd parallel) to impact, the club releases by 90 degrees (left wrist uncocks 90 degrees). During that time period, lag pressure sensed at PP#3 should theoretically decrease for a given degree of hand speed - because the left wrist is uncocking. However, an experienced golfer maintains a sense of near-constant lag pressure at PP#3 by ensuring that the right elbow straightens with sufficient isotonic force that allows the straightening right arm to keep up with the left arm (and allows the right hand to keep up with the left hand). In other words, the degree of lag pressure sensed at PP#3 is the result of the interplay of a number of biomechanical phenomena that are occurring simultaneously - i) the left hand is being driven around the small pulley of the endless belt due to the release of PA#4 which drives the left arm towards impact; ii) the speed of left wrist uncocking (which occurs passively secondary to the speed of CF release of the club); and iii) the speed of right elbow straightening which allows the right hand to keep up with the left hand. In this scenario, - PP#3 senses lag pressure, but does not drive the club. I think that two forces are driving the club at this stage of the downswing - i) the left arm pulling the left hand towards impact due to release of PA#4 => left hand pulls the grip end of the club continuously along the endless belt track; ii) CF that causes the passive release of PA#2. However, because the release of PA#2 is passive and activated by the left hand pull action at the grip end of the club (with no push-force from the right hand), then it can be said that the source of all power driving the club is essentially derived from a left hand pull action where the left hand travels along a circular arc (around the end pulley of the endless belt system). It is the left hand that drives (pulls) the club during the downswing in a swinger's action and the CF release phenomenon is simply activated by the left hand pull action (according to the principles of the double pendulum swing model). I have no idea what you mean when you state that lag pressure sensed at PP#3 drives the club, and that the lag pressure is derived from the CF acting through PP#3.

Jeff.