[Golfie McG]

Golfie

1. I don't subscribe to JK. Have read only a little of his stuff and ......

2. You seem to rely on Jorgenson

Quote:

Jorgenson in "The Physics of Golf" determines that only the legs contain enough muscle mass to power the golf swing.

Interesting to note Jorgenson did a paper exercise to come up with most of his conclusions. Actually regarding the power, he used the formula and applied it to the golf swing. Based on a professional golfer generates 2 hp (not sure where this number came from) he deduced that it require 32 pounds of muscles or 1/8 horsepower per pound and muscles must be used in pair, so 32 lbs. Since the arms and shoulders don't have 32 lbs he reasoned that other muscles must be used. Those were the legs, buttock, back aand abdomen. He considered these to be the lower body muscle group.

The hips are key to momentum transfer. If hip action is initiated it is with the buttock's muscles. The leg muscles (hamstrings) can push and pull the hips.

I find that in the introduction by Jorgenson, his description of Chapter 3, "... explains how the golf swing compares to theaction of a bullwhip, how the large muscles of the lower body, although they are not connected to the arms are used to enhance the speed of the golf club, how the pull of the shoulder on the arm works in the golf swing and who we find that the golfer does not swing about a quiet center in the downswing."

I find his choice of words, 'enhance' to support the position I have held and what I have said. I stated earlier that the lower body 'amplifies' allowing greater power.

As for the hip movement, I subscribe to this being either the first action in the down stroke, or as the golfer is about to complete the back stroke (for those who want a reference 12-3-0 section 6 #24).

Martee,

I have read Jorgenson and am glad that you have as well. I do not consider Jorgenson to be a definitive work (science does not stand still) and even within the quotes you have provided there is an error that I will show you that is pertinent to the discussion.

Now let’s be clear about what we are talking about. We are talking about which muscles perform the work (physics sense) that causes the rotor of 7-12 to spin and drive the Golfer’s Flail.

Choices are:

Leg muscles that drive hip rotation.
Torso muscles that drive torso rotation relative to the hips.
Care to add any??

Can we at least agree on the topic and choices?

Golfie