fanboi22
on the journey
@fanboi22, No, the hand doesn't roll over the front side of the ball when pitching "for real". My DD describes the release as screwing the ball into the ground.
The animation might help. The large gear is the hand, and the small gear is the ball. In an IR release, the hand is rotating counter-clockwise (for a rightie), imparting down spin on the ball.
So, the key to throwing a drop ball with a sharp break is to increase the IR rotational speed of the hand/forearm/arm. The result of quicker IR is the characteristic "hand down" follow, as opposed to the "magician" follow through.
The usual spin of a fastball is around 15RPS. It is possible for a pitcher to get up to 28RPS (or more).
Thank you for the clarification. I totally agree.