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MLB
Real aerodynamics · real fences · the verdict in all 30 parks
The trajectory shows projected distance and where the ball lands relative to the outfield wall at that point in the park. The same struck ball is a home run in one venue and a fly out in another, and the fence distance and height at that specific angle are usually the reason. Changing temperature, wind or altitude re-runs the flight so you can see how much each one is worth.
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A batted-ball flight model: give it an exit velocity, a launch angle and a direction, and it traces how that ball would carry in a chosen park under chosen conditions. It turns park and weather effects from an abstract multiplier into a distance you can see.
The trajectory shows projected distance and where the ball lands relative to the outfield wall at that point in the park. The same struck ball is a home run in one venue and a fly out in another, and the fence distance and height at that specific angle are usually the reason. Changing temperature, wind or altitude re-runs the flight so you can see how much each one is worth.
A physics model — drag, lift from backspin, and air density derived from temperature, altitude and humidity — run against measured wall distances and heights for each ballpark. It models the flight of a ball you specify; it does not project what any hitter will do.
For understanding why park and weather matter to a home-run read, and for checking specific batted-ball profiles against specific venues. Best used as a lab rather than a leaderboard.