The 18" wide clubhead was obviously not intended to be a realistic design goal. It was only created as an "idea" to get across certain concepts - that if Anthony Kim (or any other golfer) swings perfectly on-plane (per Homer's definition of an on-plane swing) and gets to the elbow plane by the 3rd parallel, then he is going to be staying on the elbow plane between the 3rd and 4th parallels. I also think that he is going to have the "feeling" that the sweetspot rotates to the clubshaft plane post-impact (X rotates to B) and there will never be a "feeling" of the hosel leaving the elbow plane post-impact and rotating around the sweetspot.
I am not at all convinced that a golfer who mentally thinks of an orbiting sweetspot, but still swings on-plane to the elbow plane by the 3rd parallel (like Anthony Kim), will generate a different clubshaft/clubhead arc of movement than Anthony Kim.
A question - the baseline of the sweetspot plane must exist outside the baseline of the clubshaft plane. During which part of the swing is the golfer tracing the sweetspot plane (aiming at the sweetspot plane)?
Can a golfer practice tracing a SPL with a dowel stick, which doesn't have a clubhead and a rotating sweetspot that is a finite distance away from the longitudinal axis of the shaft in the impact zone?
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