Know what you mean about Hogan and the Right Arm being on plane at address. But in that photo of him above, you'll notice a shag boy out in the distance , right at the top of the Shaft Plane line you drew. That is his target. As such the camera is set up square to his foot line but his foot line, stance line is closed! Dramatically. So the camera is not square to his Plane Line or the flight of his ball.
This exaggerates the off the shaft plane look of his right arm. Not saying that is an Elbow Plane it isnt. But he isnt as far off it as he looks here.
In TGM, an On Plane Right Forearm means Having a "Right Arm Flying Wedge" The Right Forearm and Clubshaft are on the same Plane as the Right Wrist Bend. It does not mean that the Right Forearm is ON The Swing Plane at Address or Release. The Right Forearm Wedge is at Right Angles to the Left Arm Wedge.
Furthermore, there is only one location in the Swing where the Flat Left Wrist actually Points to the Target; with 10-2-B; Low Point. Therefore the Right Forearm will only be flat against and resting on the Swing Plane at that Location. Unless you're on the Elbow Plane.
Quote:
6-B-3-0-1 THE FLYING WEDGES The Clubhead may appear to move in a an arc around and outside the Hands when related to the Left Arm – the very basic Left Arm Flying Wedge. But when related to the Right Forearm, it appears to move “On Plane” with the Right Forearm, at its normal rigid angle (Bent Right Wrist) – the Right Forearm Flying Wedge. So – except in Sections 1 and 3 (Chapter the entire Left Arm, the Clubshaft and the back of the Left Hand are ALWAYS positioned against the same flat plane – the Right Forearm and the Clubshaft are, in like manner, positioned on the plane of the Right Wrist Bend AT RIGHT ANGLES TO THE LEFT ARM PLANE. That is the precision assembly and alignment of the Power Package structure and is mandatory during the entire motion. Hitting or Swinging. Study 4-D-1 regarding “Grip” and “Flat Left Wrist”. Also see 7-3. Then, ideally, the Left Wrist is always Flat and the Right Wrist is always Level (4-A-1, 4-B-1).
Quote:
7-3 ... So the Right Forearm must leave – and precisely return to – its own Fix Position (7- “Angle of Approach” ...
Therefore, when the Right Forearm is at 90 degrees to the Plane line (near address or release) during the Downstroke, it does not point at the Plane Line.