How much velocity is needed to "hear" the ball?
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- Dec 11, 2010
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Quite a coincidence- how about that Kopech kid! The video of his pitches looks altered.
- Jul 2, 2013
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This ^
I think anything around 50 with good spin has a sound to it. I have caught one girl form my bucket who was in the low 60's and it has a different sound for sure. I would describe it more as a sizzle.
Just curious if anyone has any new data on this. My daughter has started throwing harder recently and now I can hear the air sizzle with her fastball pitches. It's pretty cool. I haven't clocked her recently but I thought she was throwing mid 40s. I see several responses stating this sounds starts in the 50s. Could this sizzle be coming more from her spin rotations instead of velocity? I really don't think she's in the 50s yet but could be wrong. Just curious.
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- Jan 22, 2011
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I seem to recall seeing a lot of spin on the throws of the catcher when I first started hearing the ball, so it likely involves spin as well. No hard data to back up my impression 
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I agree with around 50 and 1200 RPM+I seem to recall seeing a lot of spin on the throws of the catcher when I first started hearing the ball, so it likely involves spin as well. No hard data to back up my impression
No hard data, but I catch many of my pitchers and that's when I see/hear it. For reference I tend to start them on a change-up when they get to about 45 and movement when they hit about 50. (Cruising - not a 1 off)
I am with @corlay 47-49. Like you, I started hearing sizzle when I was pretty sure my dd was not hitting 50.
A lot depends on the age of the listener, I need at least a 55 mph pitch 
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