The golf club is an implement that has a weight on the end of a stick (shaft). The weight on the end of the stick is heavier than the stick. Whenever such an implement is thrown "end over end", the lighter shaft must revolve around the heavier weight on the end -- i.e., the heavier weight on the end becomes the center or axis of rotation. A hatchet is an example.
This is exactly right, Bob. And the phenomenon produces a very interesting visual effect.
The thrown hatchet's center of mass (or its proxy, the center of gravity) is moving a smooth arc on its way to the ground. In fact, it is attempting to move in a straight line, but gravity is pulling it toward the ground. Despite the unwavering parabolic arc of the center of mass, the rotation of the handle around that center of mass produces a visual 'tumbling' or 'wobbling' effect. That appearance of 'wobble' is caused by the hatchet's non-uniform distribution of mass, i.e., more mass is located in the head than in the handle. A thrown baseball or Chinese throwing star http://throwing-star.gungfu.com/ does not appear to wobble because, unlike the hatchet, its center of mass is directly in the middle. The point is that an object always rotates about its center of mass, despite any appearance to the contrary.
Similarly, during the Golf Stroke, the Clubshaft rotates about the Center of Mass (the Sweet Spot) of the entire Golf Club. As it does so, it moves from its own Plane -- the Clubshaft Plane at Impact Fix and Address -- to and from the Plane of the Sweet Spot.
I would submit that the Hatchet analogy is not valid. It does demostrate an off center weight and motion. But with the golf club we don't have it disconnect or free flying. So what we experience is a pulling effect against the against golf club, primary assembly, etc. This is a feel that we can either resist or follow.
In D-2 the club shaft is not moving closer to the sweet spot plane line, even with an back, up and in motion. The use of a Vertical Plane shouldn't change the characteristics. The demo example I gave earlier to show club shaft rotation should make it obvious that the shaft has to change.
How a Plane Board (Mr Kelley used this extensively in the book) can function and still have the club shaft flat against the Inclined Plane and rotate to the sweet spot line defies logic. Even in 2-F it is stated that these are two separate planes, when he suggests that you align / turn the clubface so both the Club Shaft and Sweet Spot well be on the same Plane the Start Down. Both Planes always pass through the Lag Pressure Point. I keep coming back to the fact that the Inclined Plane and Sweet Spot Plane are two separate planes, having two separte plane lines and two separate plane angles, which the Sweet Spot Plane Angle by this definition is flatter than the Inclined Plane Angle. Look at 2-C-1#1.
I realize most probably think I am being difficult or hard headed, but when someone says the Inclined Plane Line is the Target Line, etc. They are just wrong, using Mr. Kelley words. Drawing lines on the photos and labeling them and then making conclusions that the golfer is high/low etc. is IMO leading to incorrect conclusions. Understanding the Geometry, the terms and the proper application of terms to the golf stroke is all I am trying to do. Evidently with some of the response I have read it is clear that I am not doing a very good job in communicating.
I will repeat what I have stated earlier in other threads. The Sweet Spot Plane IMO is key, is fundamental to be able to delivery a solid golf stroke using Feel.
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