Post by imperfectgolfer on Feb 12, 2013 0:28:41 GMT -5
In the thread on Brandt Snedeker, Dariusz asked what does DH mean?
The term "drive-hold" is the term used to describe a golfer who can maintain a stable FLW throughout the immediate impact zone from P6.9-P7.1, and preferably to at least P7.2.
What defines the degree of stability of the FLW during its passage through the immediate impact zone? I think that "stability" of the FLW can be conceived to be a measure of the resistance of the FLW to premature breakdown = any flip-bending of the left wrist between P7 and P7.2. What creates that resistance-to-breakdown from a biomechanical perspective?
I believe that there are two major factors that can provide left wrist stability through impact - i) active forward motion of a FLW (and therefore intact LAFW) through impact and ii) active forward motion of a bent right wrist that maintains its bent impact alignment to P7.2+.
The greatest degree of FLW stability occurs when both factors are operant - equivalent to a two-handed backhanded tennis shot. However, it requires an enormous amount of flexibility to maintain a bent right wrist to well beyond impact, and I think that the golfer who best exemplifies that swing pattern was the young Lee Trevino.
Look at images 9 and 10 - note his FLW and bent right wrist, and note that he maintained his FLW/bent right wrist impact alignment to well beyond impact - and there was no horizontal flipping motion of his left wrist through impact.
Now look at his swing in old age.
Here are capture images.
Note how he is flipping his club through impact - images 1-3. Image 4 is the Dariusz-supplied image of a younger LT, who could maintain a bent right wrist to well beyond impact.
Why is LT flipping today, and not maintaining a bent right wrist to well beyond impact?
The answer relates to his lack of flexibility. He has a much more sluggish pelvic motion through impact and his pelvis is not sufficiently open at impact. That prevents his shoulders from rotating fast through impact - especially considering the fact that he has also lost his ability to rotate his right shoulder very fast (under his chin) between P6 and P7.5 and he has also simultaneously lost his ability to rotate his left shoulder socket inside-left fast after impact. The end-result is that he runs-out-of-right arm while his left arm simultaneously slows down through impact, and he is forced to allow his right wrist to straighten through impact as the clubhead's gained momentum carries the clubhead through impact without any DH-control. To control his clubhead through impact in a DH-controlled manner (as happened in his youth) he would have to manifest the ability to prevent any slowing of the forward momentum of his FLW through impact and he would also have to ensure that he could drive his bent right wrist through impact so that it could keep up with his FLW (and maintain the same constant level of push-pressure against PP#1) between P7 and P7.2+.
Jeff.
The term "drive-hold" is the term used to describe a golfer who can maintain a stable FLW throughout the immediate impact zone from P6.9-P7.1, and preferably to at least P7.2.
What defines the degree of stability of the FLW during its passage through the immediate impact zone? I think that "stability" of the FLW can be conceived to be a measure of the resistance of the FLW to premature breakdown = any flip-bending of the left wrist between P7 and P7.2. What creates that resistance-to-breakdown from a biomechanical perspective?
I believe that there are two major factors that can provide left wrist stability through impact - i) active forward motion of a FLW (and therefore intact LAFW) through impact and ii) active forward motion of a bent right wrist that maintains its bent impact alignment to P7.2+.
The greatest degree of FLW stability occurs when both factors are operant - equivalent to a two-handed backhanded tennis shot. However, it requires an enormous amount of flexibility to maintain a bent right wrist to well beyond impact, and I think that the golfer who best exemplifies that swing pattern was the young Lee Trevino.
Look at images 9 and 10 - note his FLW and bent right wrist, and note that he maintained his FLW/bent right wrist impact alignment to well beyond impact - and there was no horizontal flipping motion of his left wrist through impact.
Now look at his swing in old age.
Here are capture images.
Note how he is flipping his club through impact - images 1-3. Image 4 is the Dariusz-supplied image of a younger LT, who could maintain a bent right wrist to well beyond impact.
Why is LT flipping today, and not maintaining a bent right wrist to well beyond impact?
The answer relates to his lack of flexibility. He has a much more sluggish pelvic motion through impact and his pelvis is not sufficiently open at impact. That prevents his shoulders from rotating fast through impact - especially considering the fact that he has also lost his ability to rotate his right shoulder very fast (under his chin) between P6 and P7.5 and he has also simultaneously lost his ability to rotate his left shoulder socket inside-left fast after impact. The end-result is that he runs-out-of-right arm while his left arm simultaneously slows down through impact, and he is forced to allow his right wrist to straighten through impact as the clubhead's gained momentum carries the clubhead through impact without any DH-control. To control his clubhead through impact in a DH-controlled manner (as happened in his youth) he would have to manifest the ability to prevent any slowing of the forward momentum of his FLW through impact and he would also have to ensure that he could drive his bent right wrist through impact so that it could keep up with his FLW (and maintain the same constant level of push-pressure against PP#1) between P7 and P7.2+.
Jeff.