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Post by imperfectgolfer on Jan 22, 2013 19:11:52 GMT -5
Hi,
I am trying to find a Motion Reality video involving Jamie Sadlowski - the whole video including the commentary.
I thought I saw it posted on jeffy's forum, but I cannot find it there or on you-tube.
Can you help by providing a link?
Thanks,
Jeff.
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Post by tomdavis76 on Jan 22, 2013 19:58:43 GMT -5
Here you go:
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Post by imperfectgolfer on Jan 22, 2013 23:47:32 GMT -5
Jeffy,
Thanks for the link.
I have renamed this thread - "How does Jamie Sadlowski generate his swing power".
Consider this video.
KM/Jeffy place a major emphasis on the speed of pelvic rotation and a floating/rotating left foot when they express their "belief" regarding how an elite golfer, like Jamie Sadlowski, should best generate swing power. They also believe that the pelvic rotation drives the swing action via the spinal engine, and that the spinal engine is therefore primarily responsible for powering the pivot action, and primarily responsible for swing power generation.
I believe that the KM/Jeffy "belief" is wrongheaded. I believe that most of JS's swing power comes from the upper torso rotation, which is responsible for powering the release of PA#4. Consider JS's downswing action. He starts with an end-backswing pelvic rotation of 49 degrees and he gets to 57 degrees open at impact. That represents a pelvic rotation magnitude of 106 degrees of rotary motion. By contrast, he turns his upper torso/shoulders 166 degrees by his end-backswing, and his shoulders are 11 degrees open at impact. That represents a upper torso/shoulder rotation magnitude of 177 degrees during the same downswing time period. That is the prime reason why he can generate so much clubhead speed - because his shoulders rotate much more than his pelvis in his downswing and he can therefore release PA#4 at an ultra-fast speed. There are two other factors that allow him to generate high clubhead speeds - i) he has an ultra-flexible left wrist that allows him to get a greater amount of left wrist upcocking and therefore a greater amount of potential lag; and ii) he gets his left arm steep in his backswing so that he can get the clubshaft to overswing behind his back at the end-backswing position and he therefore "realizes" his maximum amount of clubhead lag. By maintaining that inordinate amount of lag between P4 and P5.5, he can generate an extra amount of clubhead speed from his PA#2 release action, which happens between P5.5 and P7.
I think that he gets a certain amount of clubhead speed from his pelvic rotation that starts the downswing action, and a certain amount of that pelvic rotary torque is transmitted to the upper torso via the spinal engine, but I think that he generates most of his pivot action torque via an independent contraction of his mid-upper torso core musculature that allows him to rotate his upper torso ultra-fast, so that he can rotate his upper torso 177 degrees in the same amount of time it takes him to rotate his pelvis 106 degrees.
Jeff.
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