Post by imperfectgolfer on Mar 21, 2015 12:20:24 GMT -5
See this Jeffy-forum thread - jeffygolf.com/showthread.php?1403-The-Como-Mackenzie-release-and-Tiger-how-does-this-stuff-happen
The Jeffy-forum members discuss this you-tube video by Chris Como and Sasho MacKenzie (SMK)
SMK claims that the clubshaft will passively rotate to a steeper plane if the clubshaft plane is flatter than the plane of motion of the hand arc path.
This image (derived from SMK's paper) is the theoretical basis for his claim.
That claim is correct in the P4 to P6 time period. So, if a golfer over-flattens his clubshaft plane during the P4 to P6 time period so that the clubshaft becomes off-plane (imaginary line drawn from the butt end of the clubshaft points outside the ball-target line rather than pointing at the ball-target line), then the clubshaft can steepen passively due to the fact that COG of the clubshaft is below the plane of the hand arc path.
That phenomenon obviously happens in Sergio Garcia's early-mid downswing.
Image 2 shows how Sergio Garcia actively adducts his right upper arm very actively at ths start of his early downswing between P4 and P4.5. That causes his clubshaft's plane to be shallower (flatter) than his impact zone plane (red line). Note that his clubshaft automatically/passively steepens between P4.5 - P5.5 (images 3 and 4) and I can readily accept that it occurs automatically/passively due to the fact that his clubshaft is on a flatter plane than the plane of motion of his left hand during that time period (as seen in that SMK image from his paper).
However, I think that SMK is totally wrong to infer that it diminishes the amount of muscular torque force that will be needed to release PA#3 (which happens in the P6.5 -P7 time period). Note that SG's clubshaft/hands reach his impact zone plane (= red line, which is just below the elbow plane) by P6 (image 5). Then his hands and clubshaft remain on that same plane during the sequential release of PA#2 => then PA#3 (which happens during the time period between P6 and impact). Because the clubshaft is not on a shallower/flatter plane than the hand arc path's motional plane during the P6 => P7 time period (when the muscular torque forces needed to release PA#3 must become operant) then it surely cannot affect the amount of muscular torque force needed to release PA#3.
In the Chris Como/SMK video, SMK also claims that he could not square his clubface by impact using PA#3 in his one-arm swing action without that passive force (due to the clubshaft being on a flatter plane than the hand arc path's plane) being operant. I think that SMK is wrong!
Here is a DTL video of his one-arm swing action.
Here are capture images from that video.
The red path represents his hand arc path.
Note that his clubshaft is on a plane that is not significantly flatter than the plane of his hand arc path in his early-mid downswing (images 2, 3 and 4), I don't believe that the minimal degree of clubshaft-flattening (relative to the plane of his hand arc path) that exists between P4 and P6 can reduce the amount of muscular torque force needed to release PA#3 (that happens between P6.5 and impact) when his hands/clubshaft are traveling on the same impact zone plane. How can it?
Jeff.
The Jeffy-forum members discuss this you-tube video by Chris Como and Sasho MacKenzie (SMK)
SMK claims that the clubshaft will passively rotate to a steeper plane if the clubshaft plane is flatter than the plane of motion of the hand arc path.
This image (derived from SMK's paper) is the theoretical basis for his claim.
That claim is correct in the P4 to P6 time period. So, if a golfer over-flattens his clubshaft plane during the P4 to P6 time period so that the clubshaft becomes off-plane (imaginary line drawn from the butt end of the clubshaft points outside the ball-target line rather than pointing at the ball-target line), then the clubshaft can steepen passively due to the fact that COG of the clubshaft is below the plane of the hand arc path.
That phenomenon obviously happens in Sergio Garcia's early-mid downswing.
Image 2 shows how Sergio Garcia actively adducts his right upper arm very actively at ths start of his early downswing between P4 and P4.5. That causes his clubshaft's plane to be shallower (flatter) than his impact zone plane (red line). Note that his clubshaft automatically/passively steepens between P4.5 - P5.5 (images 3 and 4) and I can readily accept that it occurs automatically/passively due to the fact that his clubshaft is on a flatter plane than the plane of motion of his left hand during that time period (as seen in that SMK image from his paper).
However, I think that SMK is totally wrong to infer that it diminishes the amount of muscular torque force that will be needed to release PA#3 (which happens in the P6.5 -P7 time period). Note that SG's clubshaft/hands reach his impact zone plane (= red line, which is just below the elbow plane) by P6 (image 5). Then his hands and clubshaft remain on that same plane during the sequential release of PA#2 => then PA#3 (which happens during the time period between P6 and impact). Because the clubshaft is not on a shallower/flatter plane than the hand arc path's motional plane during the P6 => P7 time period (when the muscular torque forces needed to release PA#3 must become operant) then it surely cannot affect the amount of muscular torque force needed to release PA#3.
In the Chris Como/SMK video, SMK also claims that he could not square his clubface by impact using PA#3 in his one-arm swing action without that passive force (due to the clubshaft being on a flatter plane than the hand arc path's plane) being operant. I think that SMK is wrong!
Here is a DTL video of his one-arm swing action.
Here are capture images from that video.
The red path represents his hand arc path.
Note that his clubshaft is on a plane that is not significantly flatter than the plane of his hand arc path in his early-mid downswing (images 2, 3 and 4), I don't believe that the minimal degree of clubshaft-flattening (relative to the plane of his hand arc path) that exists between P4 and P6 can reduce the amount of muscular torque force needed to release PA#3 (that happens between P6.5 and impact) when his hands/clubshaft are traveling on the same impact zone plane. How can it?
Jeff.