[KevCarter]

I don't come here to learn about "The D Plane" or "modern science". I get that info elsewhere. I came here to better understand what Kelley meant, as I said. The question that I asked to begin this thread was about "maximum compression" and 2-C-1. I guess the kind of answer that I was looking for, which I will provide from my interpretation of the book, would go something like this.....

For maximum compression, the clubface must close, relative to the direction that it is traveling, during the impact interval. This is a horizontal hinge motion of the clubface, and is required to keep the original contact point between clubface and ball intact throughout the interval. Also, the clubface must not "lay back" during the interval, which would add loft, permitting compression to "leak" away.

Now if I were to explain D Plane to a 6th grader, I think I'd go with this.......When the clubface hits the ball, the clubface is moving on a line, and the clubface is also pointing on a line. If you take your pencil and connect those two lines with another line, that new line is called "The D Plane". Not so scary, eh?

One more.....As someone who teaches golf every day to the masses, I can attest that the "new" balls still curve. Sometimes drastically so . Initially, at least

Thank you for the lesson on ball flight. Good luck.