[chbkk]

Jeff,

1) I attempted to illustrate my high-school understanding of Newton’s Laws of Motion with the tractor-trailer example that it takes a force to change the velocity (speed and direction) of a lump of mass. You are advocating the hosel moving in a the “clubshaft plane” while the relatively massive clubhead moving in and out and back in clubshaft plane. We then need to identify a force that makes the clubhead move like that which I find difficult to accept. Whereas I am advocating that the massive clubhead moves in plane or more precisely, the center of mass of the clubhead moves in a plane. This is like the center of mass of the skidding tractor/trailer moves in a straight line. Without other forces, the rotation if any is around the center of mass in both cases.

2) In your image of Aaron Baddeley in post #169, there are three combined actions from the left image to the right image
a) the release action of accumulator #4 – the swinging of the left arm
b) the release action of accumulator #2 – the wrist uncocking
c) the release action of accumulator #3 – the rotating of the left hand
The difficulty is that all three motions are occurring concurrently obscuring one another. But you can unravel them by doing them discretely one at a time in any sequence to get from the body posture of the left image to the body posture of the right image. Let do a) and then b) and stop. Now you can see that the clubface is near impact but severely open. Let fix our eyes on the clubhead and do c). You can now see the rotation of the hosel around the clubhead which is hidden when we do the actions concurrently.