Here is the exact quote:
"The Lever Assembly is seldom more then an inch from Full Extension at Impact".
Agreed, Mike: There is a difference between my conclusion (point of Full Extension past Impact) and the "exact [Kelley] quote" (degree of Extension at Impact). For practical purposes, I believe that my conclusion is valid.
Remember, the Left Wrist doesn't go from Cocked to Level -- then hang around a while -- and later proceed to its Uncocked condition. No sir, the Left Wrist is rapidly Uncocking -- perpendicular Wrist MOTION (4-0 / 4-B) -- and it is Releasing in one unbroken thrust. Even with the Swinger's Sequenced Release (4-D-0), there is an overlapping of the #3 Accumulator Wrist Roll and completion of the #2 Accumulator Wrist Uncocking.
In any event, the Left Wrist ideally is Level at Impact and then immediately proceeds down approximately one inch to fully-Uncocked through the Impact interval. No way does this complete Uncocking take until the end of the Follow-Through (which was Jeff's point).
Mike . . .
I don't want to get too far from the subject of this thread, but since you've raised the question . . .
If at Impact, the Primary Lever has only one inch to go until it reaches Full Extension, and if the Left Wrist is Releasing freely, then what is your best guess as to when Full Extension occurs, i.e., how far past Impact?
Yoda - you wrote-: "To maintain the Point of Compression (2-C-0) through Impact and for consistent Directional Control (2-D-0), there must be a Centered Arc. Or, a "compensating manipulation". In turn, a Centered Arc requires that both the Pivot and the Arm/Clubshaft Swing be Centered. In other words, the Pivot has its Center, and the Primary Lever Assembly (Left Arm and Club) has its Center. They are not the same."
I can understand that there are two centers of rotation - one for the pivot's center and one for the arm/clubshaft's center, but you have not explained why they both have to centered between the feet to create a centered clubhead arc.
First of all, the left arm/clubshaft has a fulcrum point at the left shoulder socket joint. However, the clubhead does not circumscribe a perfect circle around the left shoulder socket (because the clubshaft has an angle relative to the left arm that varies from 90 degrees at the start of the downswing to 0 degrees at the low point).
Secondly, the left shoulder socket has a variable relationship to the pivot center (base of the neck) during the downswing.
It's like there are two intersecting circles of rotation - left shoulder socket relative to the pivot center (where the radius is likely to be constant) and left shoulder socket to the clubhead (where the radius is constantly changing). These two circles are moving at different speeds in the downswing, and hopefully, the clubhead arc will end up being relatively circular (actually more likely to be slightly elliptical) with its low point ending up a desired distance ahead of the ball position. So, for example, if the ball is placed 4" inside the left foot, then the low point needs to be "x" inches ahead of the ball position. However, in this model - there is no necessary requirement regarding the two circles of rotation (that are both in constant motion) that the pivot center must be perfectly centralized in the stance.
Here is the downswing clubhead arc of Aaron Baddeley's swing.
Point "X" is the low point of the clubhead arc. Note that the pivot center (base of the neck) is not centralised in the stance.
Here is the downswing clubhead arc of Tiger Woods swing.
Note that the clubhead arc is elliptical. Note that the low point is at the ball position. Note that Tiger's pivot center (base of neck) is not centralized between his feet.
Would you want your dentist to be moving his head all around while he drilled your teeth? How about the surgeon in the operating room?
Homer was about repetitive precision - The Machine.
In other words, I don't think that the head (or base of the neck) has to be in the center of the stance to fulfill Homer Kelley's definitional requirement of a "stationary head" being a necessary requirement as part of the triad of essential requirements . . .
Nor did Homer Kelley believe that. In his textbook, he emphatically states that the ideal Pivot Hinge Pin falls "precisely between the Feet" (2-H / 7th edition). However, in his recorded teachings, he understood personal preferences and gave the golfer plenty of leeway. He did the same in The Golfing Machine:
"This book presents the 'uncompensated' Stroke as a goal, guide and progress report, not as a minimum entrance test. Compensation for physical limitation, personal preference or special purpose are actually specialized techniques."
-- Homer Kelley (3-A)
His recommendation was to set the Head in an Impact Fix (Section TWO) of the Stroke and then leave it there at least until the end of the Follow-Through (Section ELEVEN). Most golfers ignore this instruction, of course, and take their Adjusted Address (Station THREE) with their Heads set 'any old where'. Then, they have to Bob (Third Snare / 3-F-7-C) -- often significantly (check out Gulbis and Creamer) -- in order to achieve their desired Impact location during the Stroke itself.
I well remember standing directly in front of him in his study in January 1982 as he demonstrated this point. As he moved from a conventional 'head high' address, his bald head dropped at least a couple of inches as he moved into an Impact Fix. It was dramatic difference, so much so that I even snapped a photo.
If he were posting in this thread, I'm sure he would say "Put your head anywhere you want at Fix. Then, leave it there! The important thing is that your pivot has a center and that it moves as little as possible." Just like he told the five of us privileged to be in his Masters Class that day.
This is not news. I have written on the subject many times in the past few years. Search my archives.
Would you want your dentist to be moving his head all around while he drilled your teeth? How about the surgeon in the operating room?
Homer was about repetitive precision - The Machine.
Which one, Nicklaus or Gulbis, would you like to hit the ball out of your mouth or shoot the apple on your head?
Yoda - you wrote-: "To maintain the Point of Compression (2-C-0) through Impact and for consistent Directional Control (2-D-0), there must be a Centered Arc. Or, a "compensating manipulation". In turn, a Centered Arc requires that both the Pivot and the Arm/Clubshaft Swing be Centered. In other words, the Pivot has its Center, and the Primary Lever Assembly (Left Arm and Club) has its Center. They are not the same."
I can understand that there are two centers of rotation - one for the pivot's center and one for the arm/clubshaft's center, but you have not explained why they both have to centered between the feet to create a centered clubhead arc.
First of all, the left arm/clubshaft has a fulcrum point at the left shoulder socket joint. However, the clubhead does not circumscribe a perfect circle around the left shoulder socket (because the clubshaft has an angle relative to the left arm that varies from 90 degrees at the start of the downswing to 0 degrees at the low point).
Secondly, the left shoulder socket has a variable relationship to the pivot center (base of the neck) during the downswing.
It's like there are two intersecting circles of rotation - left shoulder socket relative to the pivot center (where the radius is likely to be constant) and left shoulder socket to the clubhead (where the radius is constantly changing). These two circles are moving at different speeds in the downswing, and hopefully, the clubhead arc will end up being relatively circular (actually more likely to be slightly elliptical) with its low point ending up a desired distance ahead of the ball position. So, for example, if the ball is placed 4" inside the left foot, then the low point needs to be "x" inches ahead of the ball position. However, in this model - there is no necessary requirement regarding the two circles of rotation (that are both in constant motion) that the pivot center must be perfectly centralized in the stance.
Here is the downswing clubhead arc of Aaron Baddeley's swing.
Point "X" is the low point of the clubhead arc. Note that the pivot center (base of the neck) is not centralised in the stance.
Here is the downswing clubhead arc of Tiger Woods swing.
Note that the clubhead arc is elliptical. Note that the low point is at the ball position. Note that Tiger's pivot center (base of neck) is not centralized between his feet.
Jeff.
"WhhhoooooWWAAAHH!!! Have mercy! This thang's killin' me!"
In 2-H Mr. Kelley wrote, ‘Though the “Head” Pivot Center is recommended, it is not at all mandatory. The important thing is that the true Swing Center for ALL COMPONENTS is around a Hinge Pin with one end at the top of the Stationary Head and the other in the ground, precisely between the feet, with no regard for Body Location or Position at any time.’
You can move your head if you choose to but what advantage is it?
Why not keep it stationary?
It is too bad that Gulbis, Creamer, Woods, Baddeley and others do not set their head at impact fix.
__________________
Archimedes suggested,Give Me A Lever Long Enough and I Will Move The World.
In 2-H Mr. Kelley wrote, ‘Though the “Head” Pivot Center is recommended, it is not at all mandatory. The important thing is that the true Swing Center for ALL COMPONENTS is around a Hinge Pin with one end at the top of the Stationary Head and the other in the ground, precisely between the feet, with no regard for Body Location or Position at any time.’
You can move your head if you choose to but what advantage is it?
Why not keep it stationary?
It is too bad that Gulbis, Creamer, Woods, Baddeley and others do not set their head at impact fix.
Yes and why did Homer choose the stationary head? Because he used his eyes focused on the ball as the easiest way for the golfer to determine if the head was stationary or not.
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