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Category

Technology/equipment

Document Type

Paper

Abstract

The purpose of this study was to clarify the aerodynamic and trajectory characteristics on four type volleyballs using the wind tunnel experiments and a hitting robot. We confirmed, in particular, that the critical Reynolds number (Recr) changed depending on the ball types and panel orientations. Recr for Mizuno ball (conventional) was determined to be ~2.8 × 105 (Drag coefficient; Cd = 0.16) on panel orientation A and ∼2.0 × 105 (Cd = 0.20) on panel orientation B. On the other hand, Recr for Mikasa ball (Olympic Official) was ∼2.9 × 105 (Cd = 0.16) in the panel orientation A and ∼3.3 × 105 (Cd = 0.15) in panel orientation B. Moreover, we found that the landing position of all volleyballs varied depending on the ball type and the orientation of the panel. In particular, Molten ball has a longer flight distance than other balls and its landing point was biased toward the left side. On the other hand, Mikasa ball had a relatively short flight trajectory and its landing point was biased to the right. Therefore, it can be hypothesized that during a float serve, the flight trajectory will change depending on the type of volleyball and their orientation.

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