Tuesday, April 02, 2013
Breaking pitches at Coors
The PITCHf/x data used here indicates a Coors Effect of about 1 inch of horizontal movement and 1.5 inches of vertical movement. The width of a bat at the sweet spot is only about 2.5 inches, so every bit of lost movement is a victory for the hitter.
Dr. Alan Nathan, an expert on the aerodynamics of a baseball in flight, has hypothesized that one would expect the Magnus effect to have only 82 percent of the impact in Denver that one would expect at sea level, since given equal atmospheric inputs (temperature, humidity), air pressure in Denver is only 82 percent of what it would be at sea level. Dr. Nathan noticed in reviewing some of my early results that the root of sum of squares of the curveball movement was .80, suggesting that atmospheric conditions explained most, if not all, of the variation in curveball spin deflection.
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