| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize the drive distance corresponding to the improvement in technique, and attain desired ball hitting by swinging the same count club by forming the face so that as the load increases, and the displacement ratio is enlarged. SOLUTION: The face material is formed so that a displacement point has near 1000 kgf, and when the applied load becomes larger than that, the displacement ratio becomes larger. Generally, the boundary of the swing speed when a beginner reaches the medium level is about 1000 kgf when it is converted to the applied load. Accordingly, the boundary is taken as a displacement point, whereby the improvement in flying distance at the time of reaching the medium level from the beginner level can be attained. Further, the difference in flying distance between weak hitting and strong hitting becomes large so that ball hitting of different types can be easily done by the same club. Thus, different ball hitting can be done by one club and the flying distance can be improved.</p> |
