| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lightweight golf club shaft whose weight is reduced to 35 to 50% of that of a conventional shaft, while maintaining conventional characteristics of a shaft, such as flexural rigidity, flexural strength, torsional rigidity, torsional strength, and crushing strength, and its outside diameter. SOLUTION: A golf club shaft formed by stacking a plurality of fiber reinforced composite material layers has a first angle layer, a first straight layer, a second angle layer, and a second straight layer arranged in this order from inside along the overall length of the shaft to serve as reinforcing layers, the second angle layer being 0.04 to 0.1 mm thick. The orientation angle of reinforcing fibers in the second angle layer is 60 to 75 deg. to the longitudinal direction of the shaft. Torsional strength is 120 kg.m.degrees (1200 N.m.degrees) or more, crushing strength is 10 kg/10 mm or more, and weight is 30 to 45 g.</p> |
