Can someone please explain what bio-mechanical mechanism, if any, that would allow a 'sweet spot' of several inches of 'level' tip travel to occur in a true 'pendulum' stroke?
I don't see how it can exist with the elbow pinned in place & the forearm swinging like a pendulum unless the forearm gets longer & shorter & longer again as it swings, which we all know is not happening.
Per Bob Jewitt's chart, the tip moves down on an arc as the back hand swings up & the tip moves back up on an arc as the back hand swings down & then the tip moves down on an arc as the back hand swings up to the finish.
I just don't see how the tip can move in a linear straight line with the elbow 'pinned' at a point in space & the back hand swinging up, down & back up again. If the elbow is 'pinned' in space & the arm is swinginng as a pendulum rod taking the butt end of the cue with it then the tip on the other end of the cue must move in an arc of the opposite direction.
If it is the wrist action that would account for a bit of lengthening & shortening of the distance from the elbow to the connection point on the cue then it would take extreme coordination & timing to time that mechanism with a plan for it in mind.
I am looking for some logical biomechanical support for the supposed sweet spot of several inches of linear straight line tip travel in a true 'pendulum' stroke.
I just do not see how it is possible with the elbow 'pinned' in place.
Thanks in advance to anyone who can shed some true light on this subject.
I don't see how it can exist with the elbow pinned in place & the forearm swinging like a pendulum unless the forearm gets longer & shorter & longer again as it swings, which we all know is not happening.
Per Bob Jewitt's chart, the tip moves down on an arc as the back hand swings up & the tip moves back up on an arc as the back hand swings down & then the tip moves down on an arc as the back hand swings up to the finish.
I just don't see how the tip can move in a linear straight line with the elbow 'pinned' at a point in space & the back hand swinging up, down & back up again. If the elbow is 'pinned' in space & the arm is swinginng as a pendulum rod taking the butt end of the cue with it then the tip on the other end of the cue must move in an arc of the opposite direction.
If it is the wrist action that would account for a bit of lengthening & shortening of the distance from the elbow to the connection point on the cue then it would take extreme coordination & timing to time that mechanism with a plan for it in mind.
I am looking for some logical biomechanical support for the supposed sweet spot of several inches of linear straight line tip travel in a true 'pendulum' stroke.
I just do not see how it is possible with the elbow 'pinned' in place.
Thanks in advance to anyone who can shed some true light on this subject.
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