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100 kilometers per hour is about nine-tenths as fast as a Knuckleball (baseball).
In other words, it's 0.930 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 1.10 times that amount.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 110 kph. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
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