Slightly off-topic, but Kyle have you (or do you know if anyone has) ever analyzed whether there is a difference between how bigger starting pitchers should be taught velo vs. how smaller starting pitchers should be taught?
I'm thinking of a Syndergaard or Giolito on the one hand, vs. a young Lincecum, Stroman, or maybe Yordano Ventura. It seems to me that the big guys can rely on their longer arms and greater bulk (weight) to generate high velocity with rather simple mechanics, but the smaller guys really, really need to build momentum down the hill (in order to generate the same force as the bigger guys, they need more acceleration), and, perhaps to maximize their acceleration, they tend to use more rotation (e.g., Lincecum and Ventura turn their back to the hitter) to make up for their shorter levers and less mass.
Or maybe I'm imagining it. In any event, I'm sure I'm not explaining it very well. Has anyone ever seen any research or analysis along these lines?
You are explaining a hard topic fairly well. ![](https://community.hsbaseballweb.com/static/images/graemlins/icon_smile.gif)
There's a ton of ways to throw at elite velocities. Most of velocity is dominated by rotational angular velocity but that's not the entire story. What's super interesting is that even with three-dimensional kinematic analyses and knowing arm speeds and rotational angular velocities of a group of pitchers (say, 10 pros - 7 minor leaguers, 3 big leaguers), you would probably do no better than random at picking out who actually threw the hardest.
How's that possible? If you know their arm speed (internal rotation and elbow extension) and everything else, you should theoretically know for sure who throws the hardest, right?
Not so much, it turns out. Efficiency of arm speed is important - is the arm speed maximally applied towards home plate? Is it "wasted" in a rotational sense, perhaps generating more spin/movement but less linear ball velocity? What's the tradeoff?
These are all questions that are unknown, and ones we work on every day here in the lab using our biomechanics lab, Trackman, and other tools. It's fun. But maddening, as you can tell. ![](https://community.hsbaseballweb.com/static/images/graemlins/icon_smile.gif)