Post by imperfectgolfer on Jan 31, 2013 14:08:56 GMT -5
Consider this Lynn Blake video on the "secret to golf".
LB states that if a golfer maintains shaft stress throughout the downswing that it will allow a golfer to maintain a constant sense of lag pressure at PP#3, and that it will avoid any possibility of flipping before impact.
LB is correct to state that if one maintains a constant level of lag pressure throughout the downswing (in a handle-dragging manner) that it will mean that a golfer cannot be flipping pre-impact. However, do professional golfers use that technique during their driver downswing. They do not - as I can demonstrate.
Consider these capture images of Lynn Blake.
perfectgolfswingreview.net/BlakeShaftStress.jpg [/img]
Image 1 shows LB demonstrating backward bending of the clubshaft at start-down that happens because the left hand is pulling the club downwards-and-forwards while the clubhead stays temporarily behind due to clubhead inertia.
Image 2 shows LB claiming that a golfer should maintain that backward shaft flex all the way through impact, and if a golfer actually achieved that goal, then he should "feel" a constant level of lag pressure at PP#3 throughout the late downswing (between P6 and P7+). LB states that the "feeling" of constant lag pressure in the late downswing (between P6 and P7+) will be like the "feeling" of dragging a wet mop (image 3).
I agree with LB statements until he discusss the situation of forward shaft lean at impact (image 4). He states that the lag pressure sensation is due to the lag maintained between the grip end of the club and the sweetspot (represented by the dotted blue line) and he even claims that the proximal-mid shaft cannot keep up with the hands and sweetspot!!! I think that's a BS claim! I think that the shaft is bent forward because the clubhead is traveling faster than the proximal clubshaft and hands at that stage of the downswing - and that means that any lag pressure sensed by PP#3 must be diminishing.
David Tutelman discusses this issue in this article.
www.tutelman.com/golf/swing/handhit.php
Look at his DT-gif image.
DT claims that positive torque, and shaft stress on the clubshaft, can only exist if the clubshaft is bending backwards, and I agree with his assertion.
DT claims that negative torque exists if the shaft bends forward.
Note that is impossible for a golfer to be exerting a hand-induced force on the clubhead in a forward direction if the shaft is bending forward - and that proves that LB is wrong to claim that a golfer is stressing the shaft at impact when the shaft is bending forward.
When does the shaft bend forward in a professional golfer's downswing?
Here are 3 examples.
Dominic Mazza
Jamie Sadlowski
Tiger Woods
One can clearly see that backward shaft flex (indicating a shaft stressing phenomenon) only exists between P4 and P5.6/P6 and that the shaft is bent forward between P6 and P7, which means that shaft stress does not exist during that time period. I think that the shaft bends forward after P5.5/P6 because those golfers use a random release action, and that the start of a PA#2 release action between P5.5 and P6 causes the clubshaft to start traveling faster than the hands. If the clubshaft is traveling faster than the hands (due to a CF-release action), then it is physically impossible for a golfer to be "feeling" the same constant sensation of lag pressure via PP#3 that he was "feeling" when he stressed the clubshaft during the early-mid downswing. I believe that it is biomechanically/mechanically correct to avoid any slowing of the forward motion of the FLW in the late downswing, which can predispose to pre-impact or through-impact flipping, but I think that monitoring of lag pressure (and hoping to maintain a sensation of constant lag pressure) during the late downswing is simply a wrong-headed, handle-dragging approach that is not suitable for a driver swing - although one can obviously use it for short iron shots where the club is manually released through impact.
Jeff.
LB states that if a golfer maintains shaft stress throughout the downswing that it will allow a golfer to maintain a constant sense of lag pressure at PP#3, and that it will avoid any possibility of flipping before impact.
LB is correct to state that if one maintains a constant level of lag pressure throughout the downswing (in a handle-dragging manner) that it will mean that a golfer cannot be flipping pre-impact. However, do professional golfers use that technique during their driver downswing. They do not - as I can demonstrate.
Consider these capture images of Lynn Blake.
perfectgolfswingreview.net/BlakeShaftStress.jpg [/img]
Image 1 shows LB demonstrating backward bending of the clubshaft at start-down that happens because the left hand is pulling the club downwards-and-forwards while the clubhead stays temporarily behind due to clubhead inertia.
Image 2 shows LB claiming that a golfer should maintain that backward shaft flex all the way through impact, and if a golfer actually achieved that goal, then he should "feel" a constant level of lag pressure at PP#3 throughout the late downswing (between P6 and P7+). LB states that the "feeling" of constant lag pressure in the late downswing (between P6 and P7+) will be like the "feeling" of dragging a wet mop (image 3).
I agree with LB statements until he discusss the situation of forward shaft lean at impact (image 4). He states that the lag pressure sensation is due to the lag maintained between the grip end of the club and the sweetspot (represented by the dotted blue line) and he even claims that the proximal-mid shaft cannot keep up with the hands and sweetspot!!! I think that's a BS claim! I think that the shaft is bent forward because the clubhead is traveling faster than the proximal clubshaft and hands at that stage of the downswing - and that means that any lag pressure sensed by PP#3 must be diminishing.
David Tutelman discusses this issue in this article.
www.tutelman.com/golf/swing/handhit.php
Look at his DT-gif image.
DT claims that positive torque, and shaft stress on the clubshaft, can only exist if the clubshaft is bending backwards, and I agree with his assertion.
DT claims that negative torque exists if the shaft bends forward.
Note that is impossible for a golfer to be exerting a hand-induced force on the clubhead in a forward direction if the shaft is bending forward - and that proves that LB is wrong to claim that a golfer is stressing the shaft at impact when the shaft is bending forward.
When does the shaft bend forward in a professional golfer's downswing?
Here are 3 examples.
Dominic Mazza
Jamie Sadlowski
Tiger Woods
One can clearly see that backward shaft flex (indicating a shaft stressing phenomenon) only exists between P4 and P5.6/P6 and that the shaft is bent forward between P6 and P7, which means that shaft stress does not exist during that time period. I think that the shaft bends forward after P5.5/P6 because those golfers use a random release action, and that the start of a PA#2 release action between P5.5 and P6 causes the clubshaft to start traveling faster than the hands. If the clubshaft is traveling faster than the hands (due to a CF-release action), then it is physically impossible for a golfer to be "feeling" the same constant sensation of lag pressure via PP#3 that he was "feeling" when he stressed the clubshaft during the early-mid downswing. I believe that it is biomechanically/mechanically correct to avoid any slowing of the forward motion of the FLW in the late downswing, which can predispose to pre-impact or through-impact flipping, but I think that monitoring of lag pressure (and hoping to maintain a sensation of constant lag pressure) during the late downswing is simply a wrong-headed, handle-dragging approach that is not suitable for a driver swing - although one can obviously use it for short iron shots where the club is manually released through impact.
Jeff.