The peel drop has the fingertips directly under the wrist (fingertips at 6pm and the wrist at 12) The roll-over drop has the fingertips more towards 3pm from the wrist. Right?
No. Everything is lined up the same at release. The hand and fingertips are rotating at release. When I get some time, I'll try to dig up the shots of my DD's hand when throwing the drop. (That is what I really like about this board. Someone challenged me, and I checked it out so I shot a video to prove he was wrong. I thought that the release would be different. *MY DD* thought the release was different. We were wrong.)
The spin comes from rotation of the hand at release. Kind of like spinning a dreidel.
I have caught and have seen loads of pitchers around the country and I will submit that at full speed the roll-over will produce a stronger break. This is only based on what I have seen.....
I totally agree with you. A full roll-over by an experienced pitcher will produce a tremendous break and with little loss of speed. It is not an easy pitch to master. There is no question that my DD had mastered the pitch, and also that my DD has some shoulder problems due to throwing the pitch.
I haven't seen a girl with a "pure" peel get much break on the ball. (I have seen the "drop change" where the pitch is a changeup and the pitcher puts spin on the ball and gets something that looks like a great deal of break.)
Wildcat: I doubt your PC is going to agree, but your DD really doesn't have to go "all in" on the rollover. There is middle ground. Look at the Scarborough drop video. She is clearly putting spin on the ball through IR, but she isn't putting enormous stress on her shoulder.
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