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Post by syllogist on Feb 2, 2020 15:17:52 GMT -5
Hi DG,
You commented about SMK's swing, "He looks like he has a non-optimal pelvic rotation. His right elbow seems almost trapped behind him and it looks like he uses a right punch elbow 'hitting' type action to help release PA#2. Amazing that he's virtually on both toes of his feet at impact and it looks very different to his one-arm swing. "
I don't bother about commenting on pelvic rotation - just my preference not to. To me, given the straight left arm and low shaft position relative to the head, his swing looks flattish. This sets the stage for when he brings his arms down ahead of his torso rotation, his right arm is forced to straighten "behind" him. I'm sure that Dr. Mann has an anatomical term for this. I don't think that he's "hitting" with his right arm. No pun intended, but I, too, find the early tip toe move to be quite a feat.
S
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Post by dubiousgolfer on Feb 2, 2020 18:45:42 GMT -5
Hi S - I made a typo error in my previous post - as I meant a hitting type of right arm straightening action (ie. PA#1) to help release PA#4 and to primarily induce release of PA#2 and PA#3.
If the right hand is leading the elbow in its straightening action , it is referred as a punch elbow action and its related to the release of PA#1 in TGM terminology.
SMK might be a 'swing-hitter'
DG
PS. I might be wrong about SMK being a 'swing-hitter' because Dr Mann's article (Power mechanics of swinging, hitting, and swing-hitting) says the following:
""Pure" swinging and swing-hitting have one biomechanical feature in common - they should both use a pitch elbow motion."
But SMK looks like he's using a punch elbow motion and could be categorised as a 'four-barrel hitting technique using an active pivot action' (4:1:2:3).
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Post by syllogist on Feb 3, 2020 6:12:32 GMT -5
Hi DG,
I have no idea what SMK's intent is when swinging. That one would have to ask him. Nor do I know if he has a physical limitation on the right side, i.e., perhaps from injury. If SMK wished to accelerate the swing by straightening his right arm, I don't think his elbow is in a particularly good position to do so. It's not in a position to be used as a fulcrum. It's nowhere near his side and "floats" in space.
S
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Post by dubiousgolfer on Feb 3, 2020 9:48:55 GMT -5
Dr Mann
I have a few questions regarding 'Swing Hitters' and 'Right Arm Swinging' (I am assuming they both use a pitch elbow motion)
Are 'Swing Hitters' releasing PA#2 using 'D'Alemberts Principle'? Are 'Right Arm Swingers' releasing PA#2 using 'D'Alemberts Principle'?
DG
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Post by imperfectgolfer on Feb 3, 2020 11:04:35 GMT -5
DG, You wrote regarding SMK-: " He looks like he has a non-optimal pelvic rotation. His right elbow seems almost trapped behind him and it looks like he uses a right punch elbow 'hitting' type action to help release PA#2 PA#4 and primarily induce release of PA#2 and PA#3. Amazing that he's virtually on both toes of his feet at impact and it looks very different to his one-arm swing." His pelvic motion in that two-armed swing is not really different to his lead arm-only golf swing action. Here are capture images that I made about two years ago. Note how Sasho gets onto his toes at impact and how he "stands-up" at impact due his loss of his spinal bend inclination angle that is secondary to his goat-humping type of pelvic motion where he goes from having anterior pelvic tilt at P4 to losing it all during his downswing. Although you and I might think that it represents a sub-optimal pattern of pelvic motion, Sasho seemingly believes that "early extension" may be the best pelvic motion pattern and he argued that point in a number of Boditrak articles/videos. I analysed those articles/videos in topic number 1 of this review paper ( perfectgolfswingreview.net/finneykinetics.html ) where I compared his opinions on the downswing's pelvic motion pattern to my personal opinions. He does use a punch elbow motion of his right elbow and he starts straightening his right elbow even before he reaches the P5.5 position. He may indeed be a swing-hitter and his personal golf swing pattern may also account for his "belief" that the hands work as a couple during the downswing action! You also asked-: "I have a few questions regarding 'Swing Hitters' and 'Right Arm Swinging' (I am assuming they both use a pitch elbow motion)
Are 'Swing Hitters' releasing PA#2 using 'D'Alemberts Principle'? Are 'Right Arm Swingers' releasing PA#2 using 'D'Alemberts Principle'?" A swing-hitter may be using the D'Alembert principle if he uses a pitch elbow motion and if he only converts from a TGM swinging action to a hitting action after P5.5. However, if the swing-hitter starts to actively straighten the right arm and use PA#1 actively before P5.5 while using a punch elbow motion then he probably is manually inducing the release of PA#2 and over-riding any centrifugal release of PA#2.
A right arm swinger (using the right arm swinging technique as described by me) should theoretically be using a pitch elbow motion of the right elbow and only be applying push-pressure at PP#1 with his right palm and where the release of PA#2 is secondary to the D'Alembert principle that is based on the shape of the hand arc path. However, in "real life" many right arm swingers are probably really swing-hitters who may be actively using PA#1 (like a TGM hitter) and who may be manually releasing PA#2 using a punch elbow motion. Then it becomes difficult, if not impossible, to truly know to what degree they are really right arm swingers rather than swing-hitters. I have played golf with many strangers who appear to fit into that ill-defined category, and where I cannot honestly decide how they are primarily powering their golf swing action despite watching them repeatedly swing during a 18-hole round of golf.
Jeff.
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Post by dubiousgolfer on Feb 3, 2020 17:13:09 GMT -5
Many thanks Dr Mann
DG
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