Few examples of planes at impact and address. Not sure what one can meaningfully derive from this but i am not an expert - I am sure there is somebody who can think of some useful point.
Is there a particular bad shot which may occur if one has one pattern or the other ?
Does it matter? Probably not because they are all pretty good strikers of the golf ball!
Address = impact shaft plane line ( approximately)
My only conclusions are that to retain Address shaft plane at impact there appears to be a substantial amount of Body ( eg vijay) manipulation or head dipping ( eg Sergio – but body angles stable)
Head can stay a bit higher if impact plane line is higher than address. BUT body angles are lost unless there is forward lean of shaft.
It is clearly a spectrum of swing pattern – here is Justin Rose http://redgoat.smugmug.com/gallery/120728/1/4341641
halfway between the two ( minimal change in shaft plane) who has dipped head quite a lot.
I am not sure which is “cause” or “effect”.
I am sure this is what Brady Riggs is demonstrating but I have not considered this before myself . He appears to be showing Justin Rose maintains Tush line and nearly keeps impact shaft plane on same plane as address but only at expense of head dipping
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