The left arm does rotate on the backswing while staying striaght via extensore action. So the rotation is occuring from the shoulder joint. The amount of rotation being used varies upong the destination of the backswing, it can also vary due to the hinge action that is going to be used, angeled, horizontal, or vertical, and finally it can vary due to the approach procedure and delivery paths.
These are just a few of The Golfing Machine Principles that can affect the amount of left arm rotation. I'm sure there are more and I look forward to others posts in this thread.
Sorting Through the Instructor's Textbook.
B-Ray
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Does the left arm rotate on the backswing? If it does how much?
A swinger's startup swivel is a 'true rotation', 90 degrees 'turn' back, 180 degrees 'roll' through. It is important to keep in mind that this is a sequenced release, uncocking the left wrist THEN rolling. It is the pivot and the straightening right arm that imparts the 'roll' through.
A hitter would in many respects look like rotation, but the power package alignments are simply staying in their relative positions so any visual appearance of turn/roll is that of the entire power package, and not the lead forearm.
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Does the left arm rotate on the backswing? If it does how much?
I think he means rotate as to turn, a straight rod rotating around the AXIS of its extension.
With 10-18-A the left wrist, arm(from left shoulder pin to the hands) and club are turned or rotated ClockWise.
This is done while mantaining the clubhead all the time in its angular motion, all the time in its single plane, that is the sweetspot plane.
Turning of the left wrist is executed until getting the left wristcock plane of motion into the sweetspot plane. In other words, this turning is executed until
the entire left arm, the clubshaft and the back of the left hand are positioned against the same flat plane, the sweetspot plane. So the left flying wedge plane matches/gets into the sweetspot plane.
So then, after this the left wrist now would be TURNED, after turning. And hands, clubshaft are now in the sweetspot plane, they were not (before) in the sweetspot plane (because clubshaft rotates around the sweetspot not viceversa) while the whole time the clubhead was and will be in the intented sweetspot plane.
Clubshaft and hands have come to be in the sweetspot plane, they were not before in this plane because of nº3 accumulator angle. But always the clubhead remained in the sweetspot plane.
Don't complicate it I'm still incubating some concepts, so all this is with zero shift, 10-7-A when I refer to a single/unique plane although I feel Homer Kelley is more referreing in section 10-6 about clubhead planes rather than clubshaft control, because clubshaft motion is three dimensional until it gets (and hands get in, left flying wedge) gets into and match/lie the sweetspot plane intended for the stroke purposes. While clubhead travel/trajectory is 2 dimensional, always the motion of the clubhead is along the sweetspot plane, a flat surface circular, 2 dimmensional motion.
Now the machine is ready to begin the downstroke.
People are free to say if this comment is right or wrong. If it is right then an important part of the golfing machine concepts have been cleared out.
Last edited by alojoo : 02-12-2007 at 06:33 PM.
Reason: around the AXIS of its extension.
Don't ask me. I am going round in circles to figure that one out.
Assumed to be, in this context, the pronation, on take away, and supination, through impact and beyond, of the left forearm. A natural occurrence in a properly executed swing which requires little, if any, augmentation.
My next question is when does it rotate in the backswing and forward swing?
This is why Homer Kelley wants the hands to be Educated. The Hands control the whole Enchilada.
You can turn (to the right clockwise) the hands on plane early- from the address position as the first move. This fans the clubface open as the hands continue the back stroke. You can take the back square for foot or so and then turn them on plane. Either way this is called Standard Hand Action. A turn to the right and a roll (to the left counterclock wise) back to the left.
** see note
The second way is called Single hand action. There is no turn to the right of the hands therefor no turn roll to the left. It is the body turn that makes them appear to turn and roll.
IN EITHER CASE: the hands control the club- the forearms follow suit. I never gave much thought as to what by forearms were doing- just my hands.
Might not be the answer you were looking for but....
Burner- bad pun
** additional info. The Hands turned to the right need a roll back to the left and is part of roll/swivel/horizontal Hinge action/swivel that is used by Swingers. That is why this Standard Hand Action is perfect. Slicers hardly ever fully return the hands via the roll, let alone HH and swivel and finish the pivot.
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