Ball sports are becoming faster and more demanding than ever before, pushing traditional ball designs to their limits. In order to meet the increasing performance requirements, the ball manufacturers are producing new designs progressively. A traditional spherical football made of 32 leather panels stitched together in 1970s has now become only 14 synthetic curved panels thermally bonded (without stitches). This I4-panels ball is believed to be more spherical and performs well. The primary objectives of this study were to evaluate aerodynamic performances of footballs made of 32 panels and 14 panels. The aerodynamic forces and moments were measured experimentally for a range of wind speeds (20 km/h to 130 km/h) and the non-dimensional drag coefficient was determined and compared.
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机译：球运动比以往任何时候都变得更快，更苛刻，将传统的球设计推向他们的极限。为了满足越来越多的性能要求，球制造商逐步生产新设计。 1970年代的32个皮革面板制成的传统球体足球现已成为仅14个合成弯曲面板的热粘合（没有针脚）。这种I4-面板球被认为是更球形的并且表现良好。本研究的主要目标是评估由32个面板和14个面板制成的足球的空气动力学性能。在实验上测量空气动力和矩，用于风速范围（20 km / h至130km / h），并测定不尺寸阻力系数。
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