Rather than interject my opinion I will ask a rhetorical question.
With a flat left hand we have the same RPM. For all hinges, but the "surface speed" or ratio of hand speed to clubhead speed is greatest for horixontal hinging, angled hinging is in the middle and the smallest retio for "true" vertical hinge. But if the ratio's are not the same how could it look the same from the center of rotation? It can't. So it won't?
Interesting, Hummm?
HB
The ratios for HH and AH are the same if the left wrist is level at impact and completely uncocked just past separation, in which case the hand and head speeds are not affected by Hinging type, because the full(HH) or half(AH) rolling wrist isn't speeding up the sweetspot through impact, but just rotating the shaft around it. The only thing HH & AH Hinging influences is face angle at separation. HH is more powerful only because it eliminates the layback component of AH through the impact interval, and so gives better compression, and not because the club head is faster.
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