[Daryl]

TGM - Ball Spin Physics

2-A RESILIENCE The response of the ball to different applications of force is the factor that determines how force must be applied to produce a desired result.................

........ Roll of the ball on the face of an inclined striker does not account for all the action produced by such an impact, especially in imparting spin to the ball. When the direction of the compressing force does not pass exactly through the center of the ball, a spin will be imparted to the ball. It will rotate on the plane of a line drawn from the line of compression to a parallel center line.

Bold by Daryl

Below, is the explanation to what Homer said in the sentence that I highlighted in bold:

Imagine drilling an off-center hole through a ball (bottom line of compression) on the line of compression and pushing a stick through it so that it sticks out both ends. This stick doesn't pass through the center of the ball. Now drill a second hole through the ball that passes through the center (Top line) and is perfectly parallel to the first hole, then insert a stick. Those two sticks represent the Spin Plane caused by the Line of Compression of that Impact. The Spin Plane is highlighted in green.





After you insert both sticks, no matter how you rotate or orient the ball, the spin plane will always be represented by those two sticks as long as "The original contact points of the Clubface and ball remain in contact throughout the entire Impact Interval". Any Impact that doesn't maintain the impact as also the separation point, unless done intentionally, is a "Mis-Hit". Furthermore, the rate of Spin is determined by the distance between those two Parallel Lines for any given Clubhead Speed.


The "Search for the Perfect Swing" does not include this information. "The Search for the Perfect Swing" and "The Physics of Golf" only outline the conditions of "Mis-Hit" Impacts.

"D Plane" is not the Science. "D Plane" (Path and Face) is Application (How to mis-hit the Ball). TGM is the Science.