[Mike O]

Hmm? RPM refers to the Plane of the Left Wrist Cock, not the Wrist Cock. The Wrist Cock occurs in a Vertical Plane. RPM occurs in the Horizontal Plane.

How many Revolutions per Minute is the Clubhead completing?
How many Revolutions per Minute is the Left Wrist completing?

Daryl,
Not sure why you haven't acknowledged Bernt's explanations of different RPM's for the left arm versus the clubshaft. I think he explained it clearly enough - If you have any left forearm rotation/upper arm rotation on the downswing - it will create greater RPM for the clubshaft than the arm.

It's important to understand Homer Kelley's context when he writes - this RPM discussion is similar to his writing's on wristcock or other concepts. When he describes wristcock as a vertical motion - doesn't mean that the left wrist is always vertical to the ground and it's motion is always vertical to the ground - becuase obviously it's not vertical to the ground and therefore it's not always making it's cocking motion vertical to the ground. If it did then yes the RPM's would be the same for the clubshaft and the arm - however in the real golfer the left wrist is rotating throughout the stroke (in relation to the ground). Look at 2K#4 and 2K-#5 - for on plane left wrist motion or vertical wrist action. Similarly 7-18 2nd paragraph discussing hand and clubhead RPM's the same - ASSUMING you are looking at an endless belt example 2-K#6.

He's writing in a certain context - part of that context is the fact that the biggest problem he saw was clubhead throwaway (different RPM's for the hands and the clubshaft given the most basic flail drawing). Much as he had said - in regards to hinge action - "no one does these things "perfectly" - perfectly meaning exactly horizontal or angles, or vertical - perfectly isn't used in regards to "optimal".

I feel it's important to understand the relevance of Homer Kelley's writings yet at the same time understand real issues/happenings as Bernt is noting in regards to noted differences in RPM's.