[Daryl]

Daryl
I have no idea what you are talking about! .

I know Jeff, but you should.

I never stated that the left arm must be blasted off the chest wall at the beginning of the downswing. I stated that the left arm gets passively blasted off the chest wall when the pivot action subsides and that usually happens in the mid-downswing.

This is one of the subjects where you lack understanding. This isn't the thread for this but I'll say it anyway. In the "Mechanical Checklist For All Strokes", #25, Extensor Action - Rhythm. It says "Rhythm" because Extensor Action should be used to prevent the Left Arm from Releasing too early. If you understand Extensor Action and its below plane force then you would understand that you can increase Clubhead Mass by increasing the Acceleration Rate which is done by increasing the amount of pressure that you create on the Pressure Points. Anyone can increase pressure on the presure points but without Extensor Action you can't choose which ones nor direct them to apply force to the ball.

#4 is Body power and as long as the Pivot is leading and pulling the Left arm, then the left arm (body power) is still contributing.

If it gets "passively blasted" off the chest wall when the pivot action subsides, then perhaps it wasn't pushed off the Chest but rather it Accelerated away from the Chest as in Momentum Transfer. The pivot is providing centripetal acceleration which induces and sustains that throwout (centrifugal).

Rotation induces a Throw-Out action, pulling the centers of gravity of every movable component, In-Line and On Plane with its axis or center, whether or not they were originally In-Line or On Plane.

Here is a video of Hogan's PA#4 release - note at what point in the downswing Hogan's left arm starts to move away from his chest wall.

It is my opinion that Hogan's PA#4 is being released in the yellow colored zone (image 2).
Jeff.

When and Where #4 begins to release is not the point of our disagreement. I claim that the #4 Accumulator is still seeking its in-line condition while the #2 Accumulator has already become in-line. And because it's seeking its in-line condition, #4 is still Active after #2 has been spent as long as the Pivot train is still operating.

My Illustration is correct. My ART lives.