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Post by imperfectgolfer on Jan 1, 2019 12:21:09 GMT -5
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Post by dubiousgolfer on Jan 2, 2019 10:30:40 GMT -5
Dr Mann Just read your article but there is one question the readers might have with regards Jordan Spieth from P5.5 - P7 You have mentioned the following "Note that his hands remain on that red line between P5.5 and P6.1, but his clubhead moves under his hands between P5.5 and P6.1 during the time period when the clubhead moves from being behind the hands to being on the other side of his hands (from a DTL viewing perspective), and that phenomenon is naturally expected, and perfectly acceptable." Question: If the clubhead is under the 'impact zone plane' red line from P5.5 - P6.1 , what biomechanical action did he make to move it back on the 'impact zone plane' from P6.1- P7? DG
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Post by imperfectgolfer on Jan 2, 2019 12:43:50 GMT -5
Dr Mann Just read your article but there is one question the readers might have with regards Jordan Spieth from P5.5 - P7 You have mentioned the following "Note that his hands remain on that red line between P5.5 and P6.1, but his clubhead moves under his hands between P5.5 and P6.1 during the time period when the clubhead moves from being behind the hands to being on the other side of his hands (from a DTL viewing perspective), and that phenomenon is naturally expected, and perfectly acceptable." Question: If the clubhead is under the 'impact zone plane' red line from P5.5 - P6.1 , what biomechanical action did he make to move it back on the 'impact zone plane' from P6.1- P7? DG Jordan Spieth's clubshaft eventually reaches the impact zone plane by impact due to the continued left forearm supination that happens throughout the later downswing. Remember that a golfer who has a bowed left wrist needs more left forearm supination in the later downswing in order to get a square clubface by impact. The timing of the left forearm supination phenomenon, which creates a conical pendular motion of the clubshaft, depends on the golfer's accumulator #3 angle at every moment of the later downswing, which also depends on how much PA#2 has released at every moment because the release of PA#3 always overlaps with the release of PA#2 to a variable degree. Each individual golfer, who has a bowed left wrist between P6 and impact, likely has a slightly different pattern of conical pendular motion between P6 and P7 and therefore a slightly different speed of having the clubshaft get closer-and-closer to the final impact zone plane by impact. Also, remember that the degree of left wrist bowing, and therefore the degree of clubshaft angulation, varies between P6 and impact. Jordan Spieth apparently has 23 degrees of left wrist bowing at P6 and only 9 degrees at impact. It's enormously complex to calculate the exact pattern of conical pendular motion that happens between P6 and P7 in golfers who have a bowed left wrist because they may manifest different variations of all these interacting phenomena. Addendum: What makes this issue more complex is that the clubhead can also move under the hands between P5.5 and P6.1 and approach impact from an underplane position if the golfer, who has a GFLW, shallows the clubshaft to a very shallow plane - like Sergio Garcia.
Note that Sergia's clubhead is closer to the ground than his hands at P6 (image 2).
So, shallowing the clubshaft down to the original shaft plane where the golfer comes into impact with a larger accumulator #3 angle also means that the clubhead path between P6 and impact is going to be more conically pendular (more rounded).
Jeff.
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Post by dubiousgolfer on Jan 2, 2019 19:51:04 GMT -5
Many thanks Dr Mann
DG
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