6-C-2-0 Clubhead Lag

[Yoda]

Originally Posted by Jim Cook

Originally Posted by Phillygolf Its the same effect as a figure skater. When the arms are extended, it increases the mass, and the figure skater slows down. When the right arm extends in the golf, we are adding effective mass, and the hands slow down. Because the shaft is moving at the same rate, or at least attempting to and the clubhead is seeking to maintain its inline relationship to the hands, or pp#3, it continues regardless of added mass or not. It never actually passes the hands because the hands are still thrusting....but the shaft, due to its whippiness, does bend because it is being overtaken by the clubhead and this is the bow we see. If you were to do the same with a thin iron bar, you most likely wouldnt be able to catch the bowing on camera - because an iron bar most likely could withstand the overtaking motion of the clubhead and the increased mass wouldnt affect it as much. All of this is due to the Conservation of Angular Momentum as explained in 6-C-2-B: "The clubhead 'overtaking' speed is governed by the Law of Conversation of Angular Momentum whereby the increased Mass resulting from any extension of the swing radius decelerates the Hands and unless they are supported by Power Package thrust or throw out action. can result in great loss of clubhead speed." . I don't quite understand how the mass was increased. Nothing was added just the configuration on the arms. In moving the arms outward the moment of inertia of the skater changed but not the mass. No mass was added to the club, no mass was added to the arms, I don't understand??

Jim...

Good point. I misspoke somewhat - what is actually happening is we are increasing the radius. Strictly speaking, we haven't really added mass. However, the term used in the explanation to me was 'effective mass'. I guess what this does is increase the moment of inertia by redistributing the mass of the rotating force.

Does that make more sense? Let me know if I am off in any of this - the purpose is to understand it.

-Patrick

Homer himself used the term 'Effective Mass' and explained how to vary it in 2-M-2 (Power Regulation). Though not explicitly defined, the term is explained in 2-M-1 (Basic Power).

Essentially, Effective Clubhead Mass is the sum of the deadweight of the Clubhead itself, plus Clubshaft Pre-Stress, plus Angular Momentum, plus the sustaining or driving actions of the applied Thrust (Muscular or Centrifugal). This is the "total effective Force that is impinged on the Ball."