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chbkk
You wrote-: "I appreciate your effort in the visual demonstration. But I think it misses a crucial ingredient: under centrifugal acceleration, the clubshaft bends from the drooping of the clubhead. You can now keep the grip-end of the bent clubshaft on your plane board with the clubhead swinging below the plane board. For a well matched club, the sweetspot should now be on plane too. I have no difficulty envision the rotation of the clubhead around the sweetspot under this scenario."
If you look at the photo series of Anthony Kim, you will see the drooping clubhead. However, there is no rotation of the hosel around the sweetspot in that composite photo. If anything, there is a visual sense that the sweetspot is rotating around the hosel of the clubshaft in those photographs. If you look carefully (using the dark grass line as a reference point) - one can imagine the hosel tracking along the surface of an imaginary inclined plane board.
OB Left
The concept of layback applies to the roll of the clubshaft while it travels along the inclined plane board. If I kept the clubshaft neutral during its travel so that the clubface was always vertical to the inclined plane board, then there could no no layback (vertical hinging). The difference between the sweetspot plane and clubshaft plane would be less in that practical demonstration if I deliberately utilized a delayed release swivel action (rather than a neutral/gradual swivel action) and if I utlized horizontal hinging. If I utilized horizontal hinging in that example, the clubshaft would still go up the plane board and the hosel would still remain on the plane board. The only difference is that the rate of clubface closure post-impact would be faster. However, the hosel would never rotate around the sweetspot - in the sense of the hosel leaving the surface of the inclined plane board.
Jeff.
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