[YodasLuke]

I am playing golf tomorrow. Reading this thread and thinking too much about it will likely cause me a few shanks tomorrow. But please don't quit the thread yet as there remain a few issues to be concluded. With Jeff's strive for truths, Yodasluke's golf skills, nmgolfer's physics, we can go a long way..... I now want to stir up some dust ......

I would like to differentiate between (a) the COG of mass of the whole club, (b) the COG of the mass of the clubhead which again is different from (c) the sweetspot on the clubface.

1. My current thinking now has shifted from keeping the clubshaft on the swing plane. I now believe that for an optimum swing from p3 to p4, we should keep pp#2 and (a) the COG of the club on plane.

2) So if we draw a straight line between pp#2 and (a), this straight line will sweep the swing plane and the centripetal and the centrifugal forces act along this line. Let me call this line the force line.

3) Under centrifugal acceleration, all the mass of the club will seek to be in line with the force line so the COG of the clubhead (b) will seek to line up with the force line.

4) The swivel rotation to close the club face is not around the hosel but should be around the line pp#2 to (a) which is now a balanced rotation.

Change it to PP #3 and we're in good shape.