levers and 6-A-2
 

Homer describes only class 3 type lever is used in the golf stroke.
Why can't class 1 type lever be used in the golf swing? Class 1 makes as much mechanical sense as class 3.

Lever Examples
 

First Class Lever = See-Saw
Second Class Lever = Wheelbarrow
Third Class Lever = Flail, or a Hammer when driving a nail.

oars in row boats are class one.....You put effort in the oar there's a fulcrum in between and the load is moved.
A golf stroke/swing doesn't have to be only class three lever system all the time.

How do you want to use a class 1 lever in the golf stroke dlam?

Is it possible to regard the shoulder rotation in the backstroke as a merry-go-round (flat) and the shoulder movement in the downstroke more as a seesaw? (Right shoulder down)

Yes I would think so. And it's pretty close to Homer's prescription too.

I think there are good patterns out there that think "flat" in the downstroke as well but flat in the backstroke isn't disputed as far as I know. It's basically how you create a turn instead of a tilt IMO.

Correct me if I'm wrong, but Homer prescribes a fulcrum, force then load in that order in the lever. The lever being either the clubshaft (secondary assembly) or the clubshaft and left arm(primary assembly).
For a class III the fulcrum is always higher then the input effort.
For the primary assembly the fulcrum is the left shoulder and the force is primarly the right arm.
Fo the secondary assembly the fulcrum is the left wrist or thumb and the force is the right arm.
All I am saying is why can't the fulcrum be the hands and the force be the shoulders or the pivot?

The "Fulcrum" is the 'Pivot point' of the Lever.

1. Left Shoulder
2. Left Wrist

"Forces" would be (Force against a Lever is where it's applied, not where it originated)

1. Left Hand
2. Right Hand
3. Left Arm (Centrifugal, Blast-Off the Chest)

"Weight" would be

1. Golf Club
2. Clubhead

This is really interesting stuff because we can generate force from multiple sources and we can change the length of the Lever and control the input-output of the Force.

For Swingers, we're concerned with acquiring and applying force to move the Primary Lever and use CF to move the Secondary Lever. The Primary Lever is a very long Lever and it takes a lot of force and much more force as the Golfclub gets longer.

I really like to use golf club as the weight....but then if we use this is the load(weight) then what is the lever? The left arm by itself or can it be the top part of the shaft + left arm?

If will use the left arm by itself as the lever then the pivot can be the force......the left shoulder is the fulcrum and the pivot is connected to the left shoulder.


If you use the concept of the top part of the clubshaft and left arm as the lever then the right hand or left hand can be used as the source of force.

There's an argument that can made that LEFT ARM BY ITSELF can be the lever.

The Lever uses a pivot point to multiply the force that can be applied to move a load. This is mechanical advantage. A form 1 Lever can move heavy loads with less effort, while a Form 3 Lever can move a Load faster than normal. You can swing a Clubhead faster than you can throw it.

I think that you can view the "counterweight trebuchet" as a dual lever: Form 1 and Form 3 while a Crowbar is Form 1 only.

The Golf Swing is dual Form 3. We don't have a choice. We also don't have much of a choice determining where the Force is Applied but we have more options in determining the source of the Force.

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.

Daryl

I looking at 6-A-3 diagram and it appears that secondary lever is actually the left hand and clubshaft, the fulcrum at the left wrist joint while primary lever is left arm and clubshaft and fulcrum is the left shoulder joint.
So clubshaft by itself cannot be a lever. The shaft must align in a straight line to the end of the humerus(left arm) or the pisiform (left wrist)

The Golfclub is an extension of your Arms. The Primary Lever moves the Golfclub, the Secondary Lever moves the Clubhead.

6.A.2
Fulcrum: Left Shoulder
Force: Hands/Force is Applied (Source of Force = Left Arm)
Weight: Golfclub

6.A.3
Fulcrum: Left Wrist
Force: Hands/Force is Applied (Source of Force = Right Arm or Left)
Weight: Clubhead

Daryl,
It is my belief that fulcrum is arbitary. As long as I have a clear idea what my levers are, what the load is and what the force is then I can even use the left elbow as a fulcrum