[Jeff]

Donn - you wrote-: "Do you buy Homers concept of Longitudinal Acceleration vs radial acceleration?"

I will deal with a swinger's swing - where HK implies that the hands supply a constant pulling force along the length of the club longitudinally (along its longitudinal axis). It is true that as the left hand moves in space it is pulling the grip end of the club in a particular direction, and that the directional force can be perceived to be pulling the grip end of the club along its longitudinal axis. However, the true reality is that the club develops angular acceleration from the very start of the downswing (because the hands are constantly changing direction) and the hand pull cannot therefore remain along the longitudinal axis of the clubshaft throughout the entire downwsing (because the club has inertia and the COG of the club doesn't move instantaneously in the same linear direction with respect to the pulling force). As the downswing evolves, and as the club progressively releases, then the hand pull direction is increasingly at an increasing angle to the longitudinal axis of the shaft.

You also wrote-: "I would think that the blue line from red line 6 to redline 7 would be straight rather that curved. Your curved line appears to suggest radial acceleration. Red line 6 is length wise down to approx hip level. Would this be the point where
pulley starts?"

I don't think that the hand movement arc is ever straight in a golf swing, and that it is always near-circularly curved. I actually think that there is no "pulley" in the hand curve of "real life" golfers (like Tiger Woods and Bobby Jones) because the hand arc curve is essentially C-shaped, with no abrupt changes in direction as would occur with a J-shaped curve.

Jeff.