Link to Part 1 Link to Part 2 Link to Part 3 Link to Part 4 Starting with the 2020 season, Seam-Shifted Wake entered the baseball lexicon. It was mentioned on broadcasts by David Cone (who took time to let me explain it), Ron Darling, and Mike Petriello. Traffic on Continue Reading
Seam-Shifted Wake Timeline Part 4
SSW moves to MLB Link to Part 1 Link to Part 2 Link to Part 3 March, 2020, I was invited to Blue Jays Spring training camp by Matt Buschman. I met separately with the MLB side and the MiLB side. There was an MiLB coach who I didn’t get Continue Reading
Seam-Shifted Wake Timeline Part 3
What did we know and when did we know it? Link to Part 1 Link to Part 2 In Part 3, I’ll discuss the discovery of Seam-Shifted Wake. I began trying to explain how sinkers work in earnest in early 2000. Initially, led by the ideas of Driveline and their Continue Reading
Seam-Shifted Wake Timeline Part 2
What we knew and when we knew it Link to Part 1 In Part 2, I’ll talk about our early baseball measurements. In 2017, I had a notion to try to measure flow over a baseball with PIV. I hired an undergraduate student to build trigger electronics. He mostly completed Continue Reading
Seam-Shifted Wake Timeline Part 1
What did we know, and when did we know it? I’ve decided to write down the whole thing. I have several motivations. None of this will be about what SSW is or how it works. That’s in the various posts in this blog and our published articles. Part 1 will Continue Reading
How to “Dial In” a Hack Attack to desired RPM and Velo: Post 75
Our high school owns a Hack Attack pitching machine. These machines have 3 solid wheels. We own the huge one that can do nearly anything. BUT, when you are operating it, any adjustment to the knobs alters RPM and velo at the same time, and often in the opposite way Continue Reading
Effect of Velocity or Altitude on Seam Shifted Wake. Part 3 of 4: Post 74
This is the third post based on John Garrett’s MS Thesis. Like 73, this won’t stand on its own. I recommend starting back at 72. Since the start of this work, all of our measurements have been made at 90 mph. We chose that number using what a friend of Continue Reading
NEW SSW RESULTS: Effect of Seams Upstream (PART 2 OF 4). POST 73
Part 1 was focused on non-spinning balls in a 4S configuration at 90 mph. This post will turn the ball 90º to focus on 2S orientations. In the next post, we’ll talk about results from lower and higher speeds followed by spinning baseballs. For each of these cases, there are Continue Reading
Post 72b: Separation upstream of a seam.
In post 72, I presented the map below (this post won’t make a lot of sense if you haven’t read that). This post will be about the blue region. A seam in this region (roughly from -10º to -28º) can sometimes cause laminar separation farther forward. The average location is Continue Reading
New SSW Results: Baseballs these days don’t know who they want to be (Part 1 of 4). Post 72
My (now former) student, John Garrett (@jwillyg20) has been working on new measurements of Seam Shifted Wake (SSW) for a couple of years. He just wrapped them up around Christmas and will soon finalize his MS thesis. This and the next few posts will be based on that work. You Continue Reading
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