Aerodynamic Differences between New and Used Soccer Balls

The surface structure of soccer balls, such as the number and shapes ball panels, has recently changed, research on aerodynamics flight trajectories new balls is actively proceeding. However, these studies are focused whereas used were never studied. In this study, aerodynamic characteristics kicked 1000 times by a robot investigated through wind tunnel tests. results compared with those obtained using balls. Regarding it was found that critical Reynold number, Recrit, changes usage. This related to transition from laminar turbulent flow airflow around ball. comparison drag coefficients at Recrit showed Telstar18 0.15 (Re = 2.5 × 105) 0.14 2.2 105), respectively; Merlin 0.13 2.8 finally, Derbystar 2.1 respectively. conditions ball, roughness damages, essential factors determine