In this study, the aerodynamic effects on an American football are characterized, especially in a tumbling, or end-over-end, motion as seen in a typical kickoff or field goal attempt. The objective of this study is to establish aerodynamic coefficients for the dynamic motion of a tumbling American football. A subsonic wind tunnel was used to recreate a range of air velocities that, when coupled with rotation rates and differing laces orientations, would provide a test bed for aerodynamic drag, side, and lift coefficient analysis. Test results quantify effect of back-spin and top-spin on lift force. Results show that the presence of laces imposes a side force in the opposite direction of the laces orientation. A secondary system was installed to visualize air flow around the tumbling ball and record high-speed video of wake patterns, as a qualitative check of measured force directions.
|Commitee:||Janus, J. M., Lacy, Thomas E.|
|School:||Mississippi State University|
|School Location:||United States -- Mississippi|
|Source:||MAI 54/02M(E), Masters Abstracts International|
|Keywords:||Aerodynamics, Engineering, Football, Sports, Tumble|
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