The Drop Ball has a 6:00 spin direction with topspin. It would be 10 times the unit less spin parameter but at list the guys who did the ground breaking work wouldnt cringe as much. I got pleasure from reading your article as it was just what I was looking for. What's a good fastball spin? but not across a large population of pitchers. Before we start diving into what spin rate means for different pitches, its important to understand what Spin Rate is, and how it is defined. A high spin rate keeps the ball from falling as much as it travels toward home plate, creating what's know in pitching parlance as "ride." Conversely, a low-spin fastball is most effective when thrown down in the zone as it gives the ball a sinking action that often results in a lot of groundballs. Sharp changes from that normal range can be seen as an early sign of unhealthy fatigue. As youll see today there are lots of layers that go into understanding how a pitch is effective. Two-seam fastballs/sinkers (MLB average spin rate 2150 rpms) should have spin efficiencies between 75-100%; this range is wide primarily due to the fact that different efficiencies work best with different spin directions, arm slots, and grip/feel. When looking closer to see if a pitcher cuts his fastball we need to understand that some pitchers have essentially grown up cutting the ball when they throw a fastball, which is incredibly difficult to change when theyve thrown thousands if not millions of pitches with that pattern. So I'm not going to do so. With the knowledge that splitters have a noticeably lower spin rate than fastballs, we can assume that the splitter grip (where the index and middle fingers are very spread out on the ball) leads to a decrease in spin rate. This can be attributed to the axis shifting to a more diagonal positionmeaning more sidespin. But if you divide your Bauer unit by 120, you essentially have the unitless tangential velocity (radius * spin rate) divided by forward velocity. Mostly because no one knows why the ball spins differently from pitcher to pitcher. A Discussion of Spin Efficiency - BaseballCloud Blog Baseball Pitching Velocity Chart from age 8-22+.
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