[Matt]

OUT is "where you're facing" as you swing. Down is into the ground. Forward is towards the target. The three dimensions. I could, theoretically, move the clubhead DOWN and OUT only. The clubhead would move perpendicular to the plane line. Now how hard would that be to do in the real world?

Really hard. Which is why you're going to move the club forward whether you think about it...or whether you don't!

Martee - I agree that the concept of three dimensions is absolutely integral to understanding the golf stroke. The vast majority of the Golfing World doesn't understand it, never will, and doesn't care. We know about it and are cognizant of it (either consciously or subconsciously) every time we make a stroke. That said, I think that once the concept is developed within the Computer we can then omit the "forward" component from our conscious thought.

I don't know if there is a component that is most responsible for "forward." I believe, as I've discussed, that it's more a factor within the geometry of the circle. It's a geometry issue, not a physics issue. Sure, physics is what explains the forces that propel the "forward" dimension, but geometry is what sets it up to begin with. Without the correct geometric structure we will have no "forward."