Now THIS is good.....a willingness to "translate" TGM into other golf instruction languages. TrackMan is not going away. Neither is physical law. TrackMan is not the "evil one", and not the only entity that has done or is doing hard research on the impact collision. In fact, TrackMan has added very little to our basic understanding of the collision to what was presented by the team of internationally-renowned scientists who conducted the research from "Search For The Perfect Swing". What TrackMan has added, among other things, is the geometry of the swing plane through the impact zone, which you would think would be right up any TGM'ers alley.
Anyhoo, there is no TrackMan term for the 3D clubhead path, just the horizontal and vertical directions during impact. I would simply call it the Clubhead Arc.
And I was under the impression that the TGM definition of Target Line is the intended starting direction of the ball flight, not necessarily the straight line from the ball at address to where you want the ball to end up, which is the "traditional" definition.??
Also, it doesn't seem like TGM recognizes the fact that, in a swing of even moderate force, the shaft tip deflects downward, allowing the COG of the clubhead to align with the axis of the shaft at impact. Specifically, you can draw a straight line from the butt section of the shaft to the sweet spot of the clubhead. Why then, is there a distinction between the "shaft plane" and the "sweet spot plane".
Back to Swinger's Hinging....I guess I'm going to have to take Kelley at face value...which is to say, for maximum compression, and to keep the original contact points intact throughout the interval, the horizontal direction that the clubface is pointing, relative to the horizontal direction that the clubhead is traveling, must change in a closing direction during the impact interval. Any idea, in degrees, how much Kelley thought that the clubface closed during the interval? In other words, how open should the clubface be at address compared to fix for horizontal hinging?
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