| 摘要 |
A football having a prolate spheroidal shape including longitudinally spaced apart first and second ends. The football is capable of being analyzed under computational fluid dynamics analysis, and includes upper and lower central regions. Each positioned between first and second upper and lower end regions, respectively. The football further includes a bladder, a cover, a plurality of boundary layer trip mechanisms coupled to the upper and/or lower central regions, and a lacing coupled to the upper central region. The analysis includes first and second configurations. The first configuration is conducted on the football with the trip mechanisms, and the second configuration is conducted on the football without the trip mechanisms. The first and second configurations provide first and second drag coefficients, respectively. The first coefficient is at least 3 percent lower than the second coefficient. The length of the upper and lower central regions is defined by the lacing.
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