To: Brian Manzella G.S.E.D
Homer uses the concept of "levers" to define Power Accumulation, where at 6-B-0 he proclaims that:
"Force is applied to the Ball through the Lever Assemblies. Power is applied to the Lever Assemblies through Pressure Points. Power is applied to the Pressure Points by Power Accumulators."
Needless to say that Homer scientifically depended on his definition of Lever Assemblies at 6-A-2 and -3, as well as 2-K and 2-L. He states that Engineering is the study of the application of Levers.
I am having difficulty understanding the context of Homer's definition of the Primary and Secondary Lever Assemblies in 6-A-2 & -3. I can appreciate Homer's concept of Levers shown in the pictures on pages 64 & 65 as applicable in a Static balanced situation. However, these Lever concepts do not hold in a Dynamic golfswing situation. The Lever Forms change into Rotating Radii.
Biomechanically, the Left Shoulder cannot be called a Fulcrum. It is a Lever pivot point but certainly not a Fulcrum. The Torso and body to the feet can be a Fulcrum which supports the arm section of the Lever at the Fulcrum shoulder pivot point. The left shoulder is not a Fulcrum.
Homer shows the Primary Lever supporting Force as being the right hand and the leverage Weight being the golf club. If the Lever length is from the clubhead to the shoulder joint, surely the total weight of the club-arm Lever length should be considered as the downward weight to be carried by the right hand. The left arm weighs a great deal more than the golf club, so the Total Weight should be located somewhere in the left arm and not the club, THUS MAKING THE PRIMARY LEVER ASSEMBLY A FORM II LEVER AND NOT A FORM III LEVER.
He ignores the weight of the Left Arm section of the Lever length in his analysis. This is not good Engineering to present an incorrect Form III Lever when in fact it should be a Form II Lever. Since this Lever Form only applies in the Static position shown, it has no bearing on the Dynamic status of the club and left arm during the golfswing itself.
In the Secondary Lever Assembly, Homer again shows some kind of Static Lever position which is a sub-section of the Primary Lever. Homer shows a second Fulcrum existing in the larger Primary Lever, and creates a new Fulcrum, the LEFT WRIST !! Now the Left Wrist is a joint or pivot and not a Fulcrum support. I even question whether the Left Hand constitutes a Fulcrum in Homer's construct because you cannot have TWO Fulcrums in ONE lever, as Homer states. You just can't slide the "shoulder" Fulcrum down to a "hand" Fulcrum in a Lever length from clubhead to shoulder. It can even be argued that the Right Hand is the supporting Lever and the Left Hand the counter Force -- a Form I Lever.
No engineer would propose these as a Lever Assembly, or even as an Assembly of Levers with Fulcrums appearing out of nowhere ... as Homer has proposed.
Since Homer's dubious representations of Levers only holds for a Static condition, they do not apply in a Dynamic condition. Even at the Static Top of the Swing point, the Lever Form changes when the Fulcrum switches to the Right Hand holding up the club while the Left Hand becomes the balancing Force against the weight of the club -- a Form I Lever.
Homer states that Force is applied to the Ball through the Lever Assemblies, but how can this be if the Levers shown in 6-A-2 & -3 have vanished through Release and into Impact with the ball? It is scientifically proven that there is a momentary disconnection between the clubhead and shaft through Impact, so leverage cannot be used to "apply the Force to the Ball". The shaft and body disappears from the clubhead though Impact. What you "feel" is not scientifically "real", but it's okay for golfswing lessons.
When the golfswing action is dynamic, there is no leverage of the hands against the handle to apply Force to the ball. In engineering terms, the right and left hands constitute a "Force Couple" against the club handle and applying a Torque and not the Static Leverage that Homer describes in 6-A -3 for the Secondary Lever.
I think it is appropriate to question Homer's use of scientific and engineering concepts, particularily since he is so patently inaccurate if not outright wrong. Homer evidently does not understand the principles of Engineering Statics and Dynamics, since he was not a graduate engineer, and not professionally competent to apply this Science. Perhaps those that control TGM, would be wise to sanitize the scientific and engineering references out of TGM and just present us with the relevant definitions and methodology that Homer has so ingeniously crafted.
The TGM method is the "diamond", while the Science is the "rough". The best of the Season to you and all here ..... [8D]
Homer uses the concept of "levers" to define Power Accumulation, where at 6-B-0 he proclaims that:
"Force is applied to the Ball through the Lever Assemblies. Power is applied to the Lever Assemblies through Pressure Points. Power is applied to the Pressure Points by Power Accumulators."
Needless to say that Homer scientifically depended on his definition of Lever Assemblies at 6-A-2 and -3, as well as 2-K and 2-L. He states that Engineering is the study of the application of Levers.
I am having difficulty understanding the context of Homer's definition of the Primary and Secondary Lever Assemblies in 6-A-2 & -3. I can appreciate Homer's concept of Levers shown in the pictures on pages 64 & 65 as applicable in a Static balanced situation. However, these Lever concepts do not hold in a Dynamic golfswing situation. The Lever Forms change into Rotating Radii.
Biomechanically, the Left Shoulder cannot be called a Fulcrum. It is a Lever pivot point but certainly not a Fulcrum. The Torso and body to the feet can be a Fulcrum which supports the arm section of the Lever at the Fulcrum shoulder pivot point. The left shoulder is not a Fulcrum.
Homer shows the Primary Lever supporting Force as being the right hand and the leverage Weight being the golf club. If the Lever length is from the clubhead to the shoulder joint, surely the total weight of the club-arm Lever length should be considered as the downward weight to be carried by the right hand. The left arm weighs a great deal more than the golf club, so the Total Weight should be located somewhere in the left arm and not the club, THUS MAKING THE PRIMARY LEVER ASSEMBLY A FORM II LEVER AND NOT A FORM III LEVER.
He ignores the weight of the Left Arm section of the Lever length in his analysis. This is not good Engineering to present an incorrect Form III Lever when in fact it should be a Form II Lever. Since this Lever Form only applies in the Static position shown, it has no bearing on the Dynamic status of the club and left arm during the golfswing itself.
In the Secondary Lever Assembly, Homer again shows some kind of Static Lever position which is a sub-section of the Primary Lever. Homer shows a second Fulcrum existing in the larger Primary Lever, and creates a new Fulcrum, the LEFT WRIST !! Now the Left Wrist is a joint or pivot and not a Fulcrum support. I even question whether the Left Hand constitutes a Fulcrum in Homer's construct because you cannot have TWO Fulcrums in ONE lever, as Homer states. You just can't slide the "shoulder" Fulcrum down to a "hand" Fulcrum in a Lever length from clubhead to shoulder. It can even be argued that the Right Hand is the supporting Lever and the Left Hand the counter Force -- a Form I Lever.
No engineer would propose these as a Lever Assembly, or even as an Assembly of Levers with Fulcrums appearing out of nowhere ... as Homer has proposed.
Since Homer's dubious representations of Levers only holds for a Static condition, they do not apply in a Dynamic condition. Even at the Static Top of the Swing point, the Lever Form changes when the Fulcrum switches to the Right Hand holding up the club while the Left Hand becomes the balancing Force against the weight of the club -- a Form I Lever.
Homer states that Force is applied to the Ball through the Lever Assemblies, but how can this be if the Levers shown in 6-A-2 & -3 have vanished through Release and into Impact with the ball? It is scientifically proven that there is a momentary disconnection between the clubhead and shaft through Impact, so leverage cannot be used to "apply the Force to the Ball". The shaft and body disappears from the clubhead though Impact. What you "feel" is not scientifically "real", but it's okay for golfswing lessons.
When the golfswing action is dynamic, there is no leverage of the hands against the handle to apply Force to the ball. In engineering terms, the right and left hands constitute a "Force Couple" against the club handle and applying a Torque and not the Static Leverage that Homer describes in 6-A -3 for the Secondary Lever.
I think it is appropriate to question Homer's use of scientific and engineering concepts, particularily since he is so patently inaccurate if not outright wrong. Homer evidently does not understand the principles of Engineering Statics and Dynamics, since he was not a graduate engineer, and not professionally competent to apply this Science. Perhaps those that control TGM, would be wise to sanitize the scientific and engineering references out of TGM and just present us with the relevant definitions and methodology that Homer has so ingeniously crafted.
The TGM method is the "diamond", while the Science is the "rough". The best of the Season to you and all here ..... [8D]
