Great post Daryl,

The Trebuchet is exactly what I consider the forces of the golf swing is. Dual lever.
Form I and Form III

Why do you consider the golf swing dual lever form III?

You can probably get close with a combination of reverse pivot and a flip release.

With form III you get help fro CF to keep the lever straight. That is a precondition for transmission of energy from the force to the moving mass. With form I the hinge will prevent proper transmission of force to the other side of the fulcrum.

That is very true Bernt,
A special shot like a flop shot might be good for class I.
There is no control over the speed of the clubhead with class I
A single class III lever type shot has more speed control more effective for the short game.

For what it's worth I think the lever approach is insufficient in describing how Accumulator #4 works and how the Left Shoulder (and the right shoulder too) really powers the golf stroke. The lever III form doesn't account for pivot power.

If you assume that the Left Shoulder is the swing center I guess that a Lever III analysis should do, but the Left Shoulder is rotating around the center axis of the stroke. The left shoulder doesn't just deliver centripetal force that keeps the club in orbit. It is torqued around the swing axis and delivers Linear Force to the clubhead via the Left Hand.

Underline by Daryl. When examining the "Lever", consider where the "Force" is applied and not what generates it.

Daryl,

When you were a boy in school and the teacher ask a question no one could answer, did all the other boys and girls point to you and say "I betcha Daryl knows the answer"?

Bernt, I agree lever III single lever doesn't account the power, this is why I believe a dual lever system is best to describe what powers the golf swing including the pivot.

The left shoulder is the center of the swing arc for some shots but I concur that the right shoulder blade can be the center of the swing arc as well.

Ok, believe what you want.

The swing center is more complicated and involves the pivot and would be another thread

Fine by me.

For a swinger, a significant part of the linear force is applied as an axial pull force through the left arm and through the shaft. With extencior action the work load will be channeled from the right side of the pivot as well. The same basically goes for a hitter. If he can play golf.

I sustain my earlier claims that pressure point #4 has a limited influence power wise. It's the pulling (and the pushing) through the shoulders that delivers the real horsepower whether you hit or swing.