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SUMMARY Key Words : Baseball aerodynamics, Aerodynamic force, Magnus effect, Ball spin, Forkball, Fastball, Wake Aerodynamic behavior of forkball and fastball are studied in a stand point of fluid dynamic research. The fastball rotates in backspin and aerodynamic lift force acts on it is toward upward by Magnus effects. This lift force is the same magnitude with gravity force for good fastball.
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