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Patrick Dufour

I’ve been postponing writing about seam-shifted wake for ages. Time to finally dive in. Part 2 once the semester is over and grading is behind me. www.laphysiquedubaseball.ca/2026/04/05/m...

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Patrick Dufour

Before diving into seam-shifted wake, Part 2 will take a short detour to explain in detail the physics behind the evolution of the seam pattern seen in this clip (originally shared by either @themagnuspi.bsky.social or @pitchingninja.com on Twitter a few years ago, I lost track of the exact source).

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Ответы

Barton L Smith

All I remember is that it was a playoff game.

Mike Fast

I was looking back trying to find the first time I observed this effect, and, unrelated, I ran across this post from @pobguy.bsky.social from 2012. It looks like Rod Cross discovered seam-shifted wake without us realizing that was what we were seeing? baseball.physics.illinois.edu/Garcia1.html

Dissecting a Mystery Pitchbaseball.physics.illinois.edu
Ответ для Mike Fast
Mike Fast

I am eager to see your explanation for the precession of the spin axis, btw.

Ответ для Mike Fast
Lucas

Hi Mike! I came across this, taken from the archives of the other site. I remember live-tweeting the 4/29 game where Garcia threw that crazy forkball and my mind being blown by how a pitch could move like that. (Hope all is well with you!)

Ответ для Mike Fast
Barton L Smith

You might be right. Eric O'Flaherty also described this to me. Called it an "Air Cutter."

Patrick Dufour

This is one example, but you see this frequently when looking at sliders in slow motion. Supported by numerical simulations, I’ll answer: What role does SSW play in this phenomenon? Why doesn’t it happen all the time, and what conditions are required? How does it affect SSW? Stay tuned.