Originally Posted by O.B.Left
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Thats interesting, Max I'll have to try to get a copy, thanks. Did it talk about an impact interval then as opposed to it being instantaneous?
When you say "65% of the difference between the clubface angle and the path"........are you suggesting that was similar to TGM's at right angles to the leading edge? Leading edge to me implies left to right not up and down. And how would that compare to modern thinking in terms of left to right ? Isnt Trackmans 85% an up and down variance? Not sure, but Id be interested in knowing.
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Yes, it does talk about an interval and how the club moves about 3/4 inch during that interval. Haven't finished yet but so far is very good.
As far as starting direction, it is 3 dimensional. You can't separate left and right from up and down. It is going to do both. IIRC the 85% number is a 2d representation of a 3d image.