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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If there is friction between the clubface and ball (and unless you put WD40 on your clubface, there will be), then the ball will start off in a
horizontal direction
between the horizontal vectors of the "normal" to the clubface and the direction that the clubhead is moving during collision (If they are the same, obviously there is no difference). This frictional element is also the reason that your 56* sand wedge will only launch in the neighborhood of 30*,
vertically, which is a percentage of the vertical vector of the "normal" to the clubface and the vertical vector of the direction that the clubhead is moving (Angle of Attack). So the ball launches both vertically and horizontally to a % of the difference between the 2 vectors for each. 85%, favoring the clubface, is an
average. The actual % varies with friction and has been identified by TrackMan to be 65-95%, again, always favoring the clubface.
It's all in "Search". I'm still trying to figure out exactly what
is in TGM. But I do know that this stuff is not.