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Post by dubiousgolfer on Sept 3, 2017 9:32:41 GMT -5
Dr Mann
If one is using the TSP on the downswing and keeping an intact 'LAFW' , will there still be some independent left forearm supination during late downswing into impact which will break the LAFW but still keep an intact LFFW? I am assuming that this must be the case because you mention in your video below at 12:50 - 13:30 that the left humerus isn't used to square the clubface.
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Post by imperfectgolfer on Sept 4, 2017 9:30:52 GMT -5
Dr Mann If one is using the TSP on the downswing and keeping an intact 'LAFW' , will there still be some independent left forearm supination during late downswing into impact which will break the LAFW but still keep an intact LFFW? I am assuming that this must be the case because you mention in your video below at 12:50 - 13:30 that the left humerus isn't used to square the clubface. The biomechanical action of supination (or pronation) only significantly disrupts an intact LAFW alignment if the angle between the clubshaft and left arm is large (moderate-to-large sized accumulator #3 angle) - as seen between P5 and P6 when a golfer shallows the clubshaft a lot during the mid-downswing (which requires a significant amount of left forearm pronation) and it is also seen post-impact if a golfer (who has a large accumulator #3 angle at impact like Sergio Garcia) uses a lot of left forearm supination between P7 and P7.2. I have demonstrated the difference between a LFFW and a theoretical LAFW in my video project - as described in this short review paper at perfectgolfswingreview.net/VP5.html . The angular difference between the LFFW and a theoretical LAFW (that exists at P5.5) then narrows between P5.5 and P7 when the left forerarm supinates from being in a pronated left forearm alignment situation at P5.5 to being in a near-neutral left forearm alignment at impact. However, that scenario doesn't happen in golfers who come down the TSP (like Phil Mickelson) and who do not shallow the clubshaft during their mid-downswing. The club releases (PA#2 releases) within the plane of radial => ulnar deviation, so it doesn't significantly disrupt an intact LAFW alignment and the release of PA#3 (involving left forearm supination) is delayed so that it only happens when the PA#2 release is nearly fully completed, and at that time period the accumulator #3 angle is small. Consider these DTL capture images of Phil Mickelson's driver swing. Image 3 is at P6 where he has an intact LAFW and an open clubface. Image 4 is at P6.5 and image 3 is at P6.7. Note that the club is releasing within the plane of his intact LAFW and that the clubface is still wide open because he hasn't started to release PA#3. Lead forearm supination then happens between P6.7 (image 5) and impact (image 6) when his accumulator #3 angle (angular difference between the red line and the clubshaft) is very small, and it doesn't cause any significant side-angulation of the clubshaft (relative to the lead arm) and it therefore doesn't significantly disrupt an intact LAFW alignment. Jeff.
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Post by dubiousgolfer on Sept 4, 2017 10:05:28 GMT -5
Many thanks again.
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