| 摘要 |
A golf club shaft has a braid layer 21 including first and second diagonal yarns 11 and 12. The diagonal yarns 11 and 12 are positioned at the degrees of orientation (+&thetas;, -&thetas;) of +30 DEG to +60 DEG and -30 DEG to -60 DEG against the longitudinal axis 13 of the shaft, respectively. The braid layer has a portion that satisfies an inequality, n.ä(t- sigma t)/cos&thetas;ü </= pi .D </= n.ä(t+ sigma t)/cos&thetas;ü, wherein t is the average width of the diagonal yarns 11 and 12, sigma t is the standard deviation of the width of the diagonal yarns 11 and 12, D is the shaft diameter, and n is the number of diagonal yarns 11 and 12. The braid layer 21 satisfying the inequality minimizes spaces S between the diagonal yarns 11 and 12. With the shaft of the present invention, the ratio of the longitudinal modulus of the shaft during a swing to the longitudinal modulus of the shaft when the head speed is zero gradually increases along with the increase in the head speed, thus suppressing shaft's deformation caused by centrifugal force during a swing and facilitating swings of the club. <IMAGE> |
