| 摘要 |
<p>A portion near a ball (3) and a club head (12) is photographed by a high speed camera (4) and a portion near a top-of-swing of a golfer (1) is photographed by a high speed camera. These images are then recorded on a high speed video tape recorder (6), and the recorded images are reproduced so that a swing time, a swing speed and a head speed can be detected by a personal computer (15), and a shaft having a optimum flex can be selected on the basis of the swing time, the swing speed, the swing time and the head speed, and the swing speed and the head speed. <IMAGE></p> |
