ABSTRACT
The time-averaged drag coefficients for four cases are shown in Fig. 1. The drag coefficient, CD, is defined as the drag divided by the product of the dynamic pressure and the projectile area. The solid line denotes CD variation on a smooth sphere (Achenbach, 1972), other
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three curves denote CD variations with soccer balls. Two of these show the case with a Teamgeist ball, while the other refers to a Fevanova ball. In the case of Teamgeist, the face orientation is also taken as a parameter. The face orientation is 0° if the valve is situated on the top against the wind, and the face orientation is 50° if the valve is situated on the right side at 50° against the wind.
