If you throw a ball with the same spin as a fastball, then the pitch is simply a low fastball.
The movement of a pitch is measured relative to the P's fastball. The movement is based on the rotational axis of the ball and the speed of rotation. (The exceptions are knuckle balls and finger pressure movement pitches.)
That is, a ball with 12-6 spin thrown with 25RPS will break more than a ball with 12-6 spin with 15RPS. Or, a ball with 12-6 spin thrown at 15 RPS will break down more than a ball thrown with 10-4 rotation and 15RPS.
The trick to throwing a real drop ball is to pronate the arm as quickly as possible during the release phase of the pitch. This means (1) delaying the start of pronation as long as possible and (2) completing the forearm pronation as quickly as possible.
This, obviously, makes the forearm spin faster than usual. The spin is then imparted to the ball.
NOTE:
In actual use, "pitches" are used in combination. During a game, pitches are relative. P's don't get points for throwing a pitch that breaks 6 inches.
The movement of a pitch is measured relative to the P's fastball. The movement is based on the rotational axis of the ball and the speed of rotation. (The exceptions are knuckle balls and finger pressure movement pitches.)
That is, a ball with 12-6 spin thrown with 25RPS will break more than a ball with 12-6 spin with 15RPS. Or, a ball with 12-6 spin thrown at 15 RPS will break down more than a ball thrown with 10-4 rotation and 15RPS.
The trick to throwing a real drop ball is to pronate the arm as quickly as possible during the release phase of the pitch. This means (1) delaying the start of pronation as long as possible and (2) completing the forearm pronation as quickly as possible.
This, obviously, makes the forearm spin faster than usual. The spin is then imparted to the ball.
NOTE:
In actual use, "pitches" are used in combination. During a game, pitches are relative. P's don't get points for throwing a pitch that breaks 6 inches.
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