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Post by imperfectgolfer on Dec 16, 2013 0:32:00 GMT -5
Consider this BM-produced image posted by Chipitin. ![](http://brianmanzella.com/pics/XYZABG.jpg) Chipitin posted this BM-quote in capital letters-: "" YOU WILL MOVE ALL SORTS OF THINGS WHILE YOU ARE ROTATING THE CLUBHEAD ABOUT THE Z AXIS.It is obvious that he will moving "all sorts of things" if he moves his clubface at the P6 position in a rotary manner - as demonstrated by that curved yellow arrow in that image. However, a golfer should not be rotating the clubface either open-or-closed (relative to the "neutral point" which I defined in my last post) at P6. I believe that gamma rotation should only occur nearer impact when the golfer releases PA#3. Jeff.
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Post by imperfectgolfer on Dec 16, 2013 23:36:41 GMT -5
As a side-issue - here is another comment about that BM image showing the three axes of clubshaft motion - X, Y and Z axis. I think that they are of zero value when thinking about optimum golf swing biomechanics, and when actually executing an efficient downswing motion. If you look at the beta axis in BM's image, you can see that there are variations in steepness of the clubshaft in the beta axis plane. How does that help one to execute a good downswing motion? I think that a skilled golfer only chooses one beta plane (in his mind) when he performs a downswing motion in "real life" - although in reality the clubshaft only remains close to that chosen beta plane (impact zone plane) between P5.5-P7. Between P4 and P5.5, it is obviously on a different (usually steeper) plane depending on the position of the hands at P4 and a golfer usually has to shallow his clubshaft between P4 and P5.5. However, there should optimally be no change in the clubshaft plane between P5.5-P7. For example, consider this Pete Cowen axe drill video. See - www.youtube.com/watch?v=tDt6N0eF-T8Note that when he actually performs his axe drill with the back of his FLW parallel to his chosen inclined plane between P6 and P7 - it is performed as if he were actually performing his downswing action on his chosen beta axis plane, and that he consistently remains on his chosen beta axis plane from P5.5-P7. Note that he releases the club (releases PA#2) first before he releases PA#3 (while constantly maintaining an intact LAFW/GFLW) and that he then subsequently releases PA#3 in his late downswing (just before impact) when he rotates the clubshaft about its longitudinal axis (= rotating the club about its gamma axis). Note that there is no change in his chosen beta axis angle (and that it is primarily determined by his accumulator #3 angle) between P6.5 and P7. Different golfers choose to be on different beta axis planes between P5.5-P7, but they do not change beta planes when their hands are below waist level. So, what value is BM's image showing the possibility of the clubshaft moving from one beta axis plane to another? Jeff.
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