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87 knots is about one-and-three-tenths times as fast as a Curveball (baseball)
In other words, it's 1.3 times the speed of a Curveball (baseball), and the speed of a Curveball (baseball) is 0.77 times that amount.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 65 knots. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
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