10-20 Downstroke Triggers

[drewitgolf]

Assuming other Alignments and ball position are OK, teach your student to Hinge properly to get rid of the blocks...Hands, Hands, Hands.

[dkerby]

Bigwill, The pivot comes after the shoulder drop when the
pulling of the left arm starts. I guess that, as Homer
Kelley says, the left arm is actually substituting for the
pivot to introduce the circular motion required to produce
Centrifugal Force. The student does not want to start
the downswing with a pivot, to set #4. How forcefull should
the instruction be to insist on the pivot or should I just try
to help the guy with a less effective stroke?

drewitgolf, am rechecking Alignments, ball position and
hinge to get rid of blocks.

[Jeff]

DK it would appear to me that your student conceptualizes the swing according to Leslie King's swing methodology

See - http://www.golftoday.co.uk/proshop/tuition/index.html

I think that an understanding of TGM's power accumulators allows one to understand the difference between the LK arm swing style and the body-pivot swing style. A swinger uses a particular sequence of PA release - 4:1:2:3. PA#4 is the master power accumulator and it is the angle between the left arm and chest wall between the shoulder sockets.



During the backswing one gets the left arm across the chest wall (loading of PA#4) and during the downswing this angle is released.

In the Leslie King swing methodology the left arm is actively swung away from the chest wall by active contraction of muscles around the left shoulder girdle (colored in red in the next photo).



By contrast, the pivot-driven swing has a kinetic sequence where the hips/shoulders/arms rotate in a particular sequence and decelerate in a sequence.



The arms rotate at the same speed as the hips/shoulders in the early/mid downswing and only accelerate more dramatically (release of PA#4) when the torso pivot decelerates. The arms are essentially catapulted passively off the chest wall, rather than being pulled actively off the chest wall by the left shoulder girdle muscles (as occurs in the LK swing style).

If your student understands the differences, then he may decide to use the standard pivot-driven swing method of releasing PA#4.

Jeff.

[biomechanic]

The hips,shoulders and arms don't moving at the same speed at the beginning of the down swing 6-M-1 say hips,shoulders arms,
hips accelerate first and moving the fastest in the initial start of the downswing, then the shoulders are moving faster, thens arms followed by the club head, then the hips decelerate first,then shoulders then arms then club head.
you compare a cheap $40,000 dollar 6 dof electronmagnetic sensor graph,
I thinks it funnys you trying to compare a t.pi. graph to a kinetic link which uses a vicon d of system well 0ver $150,00.
good to see you have throughly done your research before presenting pathetic kinnematic chains which is missing a world on information,