| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a shaft to twist and to make self-correction in such a manner that the clubface of a club head at the time of impact faces a direction to let the ball fly. SOLUTION: The golf club is arranged in a space by clamping and fixing a length portion of 150 mm from the end on the grip part side of a shaft in such a manner that the axis M of the shaft parallels with a ground surface and that the normal of the clubface of the club head to the clubface in the central position of the clubface parallels with the ground surface. A straight line L1' obtd. by projecting the normal L1 to the clubface in the central position of the clubface of this time onto a perpendicular plane Q to the axis M of the shaft and a straight line L2' obtd. by projecting the normal L2 to the clubface in the central position of the clubface when a load of 1.1 kg toward a perpendicular direction is applied on the length position (P) of 98% the total length (N) of the golf club from the end on the grip portion side of the shaft in the state of arranging the golf club in the same manner as described above onto the perpendicular plane Q to the axis M of the shaft are so set as to intersect with each other at an intersection angle (θ) of 0<θ<=3.5 deg..</p> |
