抄録
We developed the measuring system of a racket and a ball in order to cvaluate a tennis racket. We can mesure motions of a racket and a ball by this system for example a racket speed of an impact point, an angle of inclined racket's face and a spin rate of a ball etc. We measured two player's motions when they used three rackets with different repulsion properties. We comfirmed that players changed their swing motions unconsciosly and individualy depending on each racket and their abilities and the differences related to their feeling. We are going to develop new concept rackets by considering the relationship of racket's properties and player's abilities.
