Abstract
We pay our attention to an aerodynamics sound in this study and study it. An effective thing was suggested, but after checking the reduction effect with the cylinder with the tape as other technique, an aerodynamics sound was reduced than the result that paid its attention to the surface state of the combination slant cylinder by aerodynamics sound reduction. Furthermore, we performed the investigation about the cause that an aerodynamics sound was reduced by inspecting data of C.O.P about the race. As a result, the disorder that was a noise source of the race understood that it was dispersed by attaching tape.
