Arm length and pitch speed in softball

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Discussion Overview

The discussion centers around the relationship between arm length and pitch speed in softball, particularly in the context of the Women's College World Series. Participants explore the implications of physical attributes, such as arm and leg length, on pitching performance, with a focus on angular motion and delivery techniques.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that longer arm length may lead to faster pitches due to higher circular speed at the same angular speed.
  • Another participant counters that a shorter arm might accelerate faster, highlighting the importance of the 'whiplash' effect in pitching.
  • A different viewpoint introduces the idea that longer legs can contribute to pitching speed by allowing for a more effective forward step during the pitch.
  • One participant shares a personal pitching technique that involves specific timing and body positioning to maximize pitch effectiveness, though this is presented as a personal experience rather than a generalizable method.

Areas of Agreement / Disagreement

Participants express differing opinions on the impact of arm length and leg length on pitch speed, indicating that multiple competing views remain without a clear consensus.

Contextual Notes

The discussion includes various assumptions about physical mechanics and personal experiences that may not be universally applicable. There are also unresolved questions regarding the specific contributions of different body mechanics to pitch speed.

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The big event of the softball season, the Women's College World Series, begins Thursday. One aspect I find interesting is that many of the dominant pitchers are very tall. Many of you are probably familiar with the underhand delivery of fastpitch softball, which implicates angular motion. The question is, does longer arm length lead to faster pitches (all else equal)? As I non-physicist, I have explored various sports-related writings and consulted with physicists to address this topic. What I've come up with, for now, is displayed on my college softball blog:

http://collegesoftball.blogspot.com/2006/05/one-thing-that-cannot-have-escaped.html

Any comments, corrections, clarifications, etc., are welcome. Just add them below. Thanks!
 
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That's mighty interesting. For the same angular speed, the longer arm would indeed have a higher circular speed. Intuitively, though, and from having some experience in the matter, it seems that a shorter arm can accelerate faster. A very large factor is also how much of a 'whiplash' effect the pitcher uses.
 
Not only longer arms, but longer legs, which allows a pitcher to step more forwards when pitching. While flipping channels, I just happened to catch the pitcher for Texas, and she apparently has the highest average number of strikeouts per 7 innings. She was tall and moderately thin. I'm not sure if she throws the fastest, or just has more variety of pitches and good placement. The windup is a bit over 360 degrees, and the leg motion and body twist seem to add to the delivered velocity.
 
I'm not too sure how others do it. What worked best for me was to step forward and across with my left foot, timed so that it planted exactly when my hand was passing my hip. At that point, my lower body would be facing about 80 degrees to the right of the target, with my upper body still facing toward it. I would then violently stop my upper arm as it was vertical, and use my bicep to further accelerate my forearm to about a 45 degree downward angle, at which point I would release the ball.
It seems pretty weird in print, but it was effective.