Birch, Stewart, Kolasch & Birch, LLP
Golf club shaft
A shaft 6 has a plurality of layers a1 to a10. The layers include a bias layer in which an absolute angle θa of a fiber to a shaft axis line is 10 degrees or greater and 70 degrees or less, and a hoop layer in which the angle θa is equal to or greater than 80 degrees. The layers include a full length layer disposed all over in an axis direction of the shaft, and a partial layer partially disposed in the axis direction of the shaft. The partial layer includes back end reinforcing bias layers a4 and a6, and a backend reinforcing hoop layer a5. In the shaft 6, a torsional rigidity value GIt at a point separated by 300 mm from a butt end is 3.5×106 (kgf·mm2/deg) or greater and 5.0×106 (kgf·mm2/deg) or less.
Dunlop Sports Co. Ltd.
A A A
A63B A63B A63B
additional inventional inventional
Takashi
Nakano