Post by syllogist on Sept 29, 2019 8:19:46 GMT -5
Hi db,
Mr. Ryan replied to you:
"I could not have explained the physics any better than you have. For clarification the reference plane is the vertical z axis. Then the arms move from a steeper to a shallower plane. This has been shown by Coleman and Rankin. "A three-dimensional examination of the planar nature of the golf swing."
I have been spending my time trying to understand how a human golfer is able to achieve this piece of physics. I believe I am in the last stages of understanding how pros achieve it.
"
Let's first recall that Mr. Ryan claimed a few years ago that he discovered a heretofore unknown aspect of physics that elite golfers use and that results in the "squaring" of the clubhead. He further claimed that his use of such aspect of physics substantially increased his distance.
You may have read Sasho McKenzie's mathematical study that showed that a hand path steeper than the angle of the clubshaft could induce rotation of the clubshaft and aid in squaring and vice versa for a clubshaft angled steeper than the hand path. In a video interview, McKenzie waivered on the subject as to whether the elite golfer "worked" (as in concerted forearm rotation) to square the clubhead. His argument that something has to be done to square the clubhead was to physically demonstrate that a clubshaft aligned with the hand path (pure double pendulum) would not result in clubface rotation. Of course this would be true if the swing were perfectly planar, but it's not. Further, isn't it true that Coleman & Rankin's observation that the hand path steepens during the downswing due to the straightening of the trail arm?
Is trying to evoke a conical trajectory of the clubhead at the bottom of the swing beneficial in any way? Mr. Ryan's way is to retain radial deviation in the lead wrist and he appears still to be in search of the best biomechanical way to do so. One can utilize Cochran & Stobbs "screwdriver" approach where one can rotate the lead hand in the targetward direction while that hand is in radial deviation, which will create a conical trajectory. C&S, too, believed that this would result in addition clubhead speed that otherwise would not be achieved.
From an overhead perspective, at the bottom of the swing, the hand path is curvilinear. I think that you have referred to this as "rounding the corner." As such, the trajectory of the clubhead affects the orientation of the hands as the clubhead moves "outward." Such is responsible for "squaring" the clubhead. Such is also responsible for the more rapid "outward" movement of the clubhead, relative to the travel of the hands, commonly referred to as "release."
S
Mr. Ryan replied to you:
"I could not have explained the physics any better than you have. For clarification the reference plane is the vertical z axis. Then the arms move from a steeper to a shallower plane. This has been shown by Coleman and Rankin. "A three-dimensional examination of the planar nature of the golf swing."
I have been spending my time trying to understand how a human golfer is able to achieve this piece of physics. I believe I am in the last stages of understanding how pros achieve it.
"
Let's first recall that Mr. Ryan claimed a few years ago that he discovered a heretofore unknown aspect of physics that elite golfers use and that results in the "squaring" of the clubhead. He further claimed that his use of such aspect of physics substantially increased his distance.
You may have read Sasho McKenzie's mathematical study that showed that a hand path steeper than the angle of the clubshaft could induce rotation of the clubshaft and aid in squaring and vice versa for a clubshaft angled steeper than the hand path. In a video interview, McKenzie waivered on the subject as to whether the elite golfer "worked" (as in concerted forearm rotation) to square the clubhead. His argument that something has to be done to square the clubhead was to physically demonstrate that a clubshaft aligned with the hand path (pure double pendulum) would not result in clubface rotation. Of course this would be true if the swing were perfectly planar, but it's not. Further, isn't it true that Coleman & Rankin's observation that the hand path steepens during the downswing due to the straightening of the trail arm?
Is trying to evoke a conical trajectory of the clubhead at the bottom of the swing beneficial in any way? Mr. Ryan's way is to retain radial deviation in the lead wrist and he appears still to be in search of the best biomechanical way to do so. One can utilize Cochran & Stobbs "screwdriver" approach where one can rotate the lead hand in the targetward direction while that hand is in radial deviation, which will create a conical trajectory. C&S, too, believed that this would result in addition clubhead speed that otherwise would not be achieved.
From an overhead perspective, at the bottom of the swing, the hand path is curvilinear. I think that you have referred to this as "rounding the corner." As such, the trajectory of the clubhead affects the orientation of the hands as the clubhead moves "outward." Such is responsible for "squaring" the clubhead. Such is also responsible for the more rapid "outward" movement of the clubhead, relative to the travel of the hands, commonly referred to as "release."
S