Having, yourself, closely worked with Homer Kelley, do you have any "inside knowledge" as to why a paddle wheel was chosen? Feathering or partly feathering the blades of a paddle wheel, while the wheel is rotating at a constant speed, could be used to control the speed of the vessel. Frankly, I don't see the connection to the golf swing.
The Paddlewheel reference has nothing to do with Zone #2 (Clubhead Power) and everything to do with Zone #3 (Clubface Alignment).
The blades of a paddlewheel remain vertical to their axis of rotation. So, too, does the golfer's Flat Left Wrist remain vertical (through Impact) to one of the three Basic Planes (Horizontal, Angled or Vertical). This Left Wrist Paddlewheel Action -- Hinge Action per 2-G -- produces an equivalent Clubface Paddlewheel Action with its corresponding Rhythm (Left Arm and Clubshaft remaining In-Line per 6-B-3-0).
And the basis of it all is the straightening Right Arm (Right Forearm and Elbow Action) executing its own Paddlewheel Motion. It is this Action that directly (Muscularly Hitting) or indirectly (Centrifugally Swinging) drives the Left Arm Flying Wedge and assures the proper Clubface Closing through Impact.
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