What causes Ball Spin? (top spin)

[bowl1820]

That was actually a very simple way to explain what Rob was talking about where you get revs without moving your hand up the ball.

I'm actually quite interested in trying that...but also kinda frightened.... : o

It's basically the same motion as turning a doorknob. Palm up, hand cocked, grab a doorknob and a 1/4 turn.

Ron Clifton:
"The proper motion is often described as turning a door knob and indeed that is not too far from the truth. If you walk up to a door knob with your palm up, your wrist cocked and cupped and turn the knob you will be close to the right motion."

[Aslan]

If you're taking your hand from the inside and motioning to the outside. Why is that a better spin than rotating from the bottom around the outside? It seems like in both cases you hand is traveling 90-180 degrees. I'm just wondering why it's so much better to go inside quadrant 135 degrees and release your hand to the right...versus going from under the ball up the side about 135 degrees. Seems like same ball, same hand, same spin. Confusing.