Abstract
The panel architecture of the soccer balls used in the World Cup has changed in every four years' convention. It is understood that the change in the panel structure in the soccer ball exerts a big influence on the aerodynamic characteristics. It is well known that the non-rotating shot by "Team Geist" appeared in 2006 becomes a oscillating ball in the long or middle distance shot. Especially, the unpredicted shot trajectory was a problem for "JABULANI," the 2010 World Cup official ball. "Speed Cell" was appeared to fix the deficit of "JABULANI" as an official ball of FIFAWomen's World Cup Germany 2011. Both of the panel shapes looks the same but the aerodynamic characteristics of "Speed Cell" is different from "JABULANI."
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