| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve a carry of a ball by displacing the gravity center of a club, without changing a swinging head speed. <P>SOLUTION: The club has a built-in ballast hanged by a spring inside the shaft and changes its gravity center by moving the ballast with a centrifugal force of a swing toward the head of the club. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
