Golf club shaft
View Patent ↗A wood golf club ( 10 ) which is not less than 44 inches in a length thereof and whose head ( 14 ) is not less than 190 g in a weight thereof. The value of a ratio of a rigidity value EIt at a position spaced at an interval of 130 mm from a head-side front end of a shaft ( 11 ) of the golf club ( 10 ) to a rigidity value EIb at a position spaced at an interval of 250 mm from a grip-side rear end of the shaft ( 11 ) is set to not less than 0.50.
1. A wood golf club which is not less than 44 inches in a length thereof and whose head is not less than 190 g in a weight thereof, wherein
a value of a ratio of a rigidity value EIt at a position spaced at an interval of 130 mm from a head-side front end of a shaft of said golf club to a rigidity value EIb at a position spaced at an interval of 250 mm from a grip-side rear end of said shaft is set to not less than 0.60 nor more than 0.80; and
said rigidity value EIt is not less than 2.50×10 6 kgf·mm 2 nor more than 4.00×10 6 kgf·mm 2 .
2. The golf club according to claim 1 , wherein said rigidity value EIb is not less than 2.00×10 6 kgf·mm 2 nor more than 10.00×10 6 kgf·mm 2 .
3. The golf club according to claim 2 , wherein a weight of said head is not more than 210 g.
4. The golf club according to claim 2 , wherein a length of said golf club is set to not more than 48 inches; and a volume of a head is set to not less than 360 cc nor more than 500 cc.
5. The golf club according to claim 2 , wherein a shaft is made of resin reinforced with a reinforcing fiber.
6. The golf club according to claim 1 , wherein a weight of said head is not more than 210 g.
7. The golf club according to claim 6 , wherein a length of said golf club is set to not more than 48 inches; and a volume of a head is set to not less than 360 cc nor more than 500 cc.
8. The golf club according to claim 6 , wherein a shaft is made of resin reinforced with a reinforcing fiber.
9. The golf club according to claim 1 , wherein a length of said golf club is set to not more than 48 inches; and a volume of a head is set to not less than 360 cc nor more than 500 cc.
10. The golf club according to claim 9 , wherein a shaft is made of resin reinforced with a reinforcing fiber.
11. The golf club according to claim 1 , wherein a shaft is made of resin reinforced with a reinforcing fiber.
12. The golf club according to claim 1 , wherein the shaft comprises prepregs with reinforcing fibers oriented at an angle of 0° with respect to the axis of the shaft, the reinforcing fibers consisting of carbon fibers.