I was thinking about the right arm driving crossline in a Hit stroke with an Angle Hinge toward right field vs a Horizontal Hinge Action of the Swing stroke that rolls the face shut.
Both Hitter and Swinger see their respective Delivery Lines as being on the ground, not on the Plane.
There are three possible Delivery Lines to guide the Clubhead into Impact:
1. The true Geometric Plane Line. This is the straight-line Base Line of the Inclined Plane, and it may be used by both Hitter and Swinger. As the fundamental Plane Line Variation listed for both the Basic Stroke Patterns -- Drive Loading (Hitting / 12-1-0) and Drag Loading (Swinging / 12-2-0) -- it sits atop the Target Line. The player Traces this Line with the Clubhead, the #3 Pressure Point and the Right Forearm to Deliver the Clubhead into Impact.
2. The Arc of Approach. This is the curved line of the Clubhead Blur through Impact. It is a Visual Equivalent of the true Geometric Plane Line and is best restricted to Swinging. The player Covers this Line with the Clubhead and Traces it with the Right Forearm and #3 Pressure Point to Deliver the Clubhead into Impact.
3. The Angle of Approach. This is the straight line drawn through the Impact Point and Low Point. It is likewise a Visual Equivalent of the true Geometric Plane Line and is best restricted to Hitting. Because the Inclined Plane is inclined, this Delivery Line goes out to "right field." The player Covers this Line with the Clubhead and Traces it with the Right Forearm and #3 Pressure Point to Deliver the Clubhead into Impact. Hitters may use -- but are not required to use -- this Line to guide their Cross-Line Thrust through Impact. If it is used, it serves only as a Delivery Line (to Cover) and not as a substitute Closed Plane Line (to Trace). It is, in fact, the Angle of Approach to the Geometric Plane Line, not a true Plane Line in and of itself. If it were a true Plane Line, then it would have an Angle of Approach. And as all seasoned students of The Golfing Machine know...
There is no Angle of Approach to the Angle of Approach.
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