Golf club shaft
View Patent ↗In a shaft 6 , a shaft full length is defined as Ls, and a distance between a tip end of the shaft and a center of gravity G of the shaft is defined as Lg. Lg/Ls is 0.52 or greater and 0.65 or less. A shaft weight is equal to or less than 52 g. Preferably, the shaft 6 has butt partial layers a 5 and a 6 . When a point separated by 250 mm from a butt end Bt is defined as P 2 ; a range from the point P 2 to the butt end Bt is defined as a specific butt range; the total weight of the butt partial layers a 5 and a 6 existing in the specific butt range is Wa gram; and a weight of the shaft in the specific butt range is defined as Wb gram, Wa/Wb is preferably equal to or greater than 0.4.
1. A golf club shaft having a tip end and a butt end with a butt partial layer,
wherein if the shaft full length is defined as Ls and a distance between a tip end of the shaft and a center of gravity G of the shaft is defined as Lg, then Lg/Ls is 0.52 or greater and 0.65 or less;
a shaft weight is equal to or less than 52 g; and
wherein if a point separated by 250 mm from the butt end Bt is defined as P 2 ; a range from the point P 2 to the butt end Bt is defined as a specific butt range; a weight of the butt partial layer existing in the specific butt range is defined as Wa grams; and a weight of the shaft in the specific butt range is defined as Wb grams, then Wa/Wb is equal to or greater than 0.4.
2. The golf club shaft according to claim 1 , wherein the shaft weight is equal to or less than 50 g.
3. The golf club shaft according to claim 1 , wherein a fiber elastic modulus of the butt partial layer is equal to or less than 20 t/mm 2 .
4. The golf club shaft according to claim 1 , wherein a fiber elastic modulus of the butt partial layer is equal to or less than 20 t/mm 2 .
5. The golf club shaft according to claim 1 , wherein the shaft full length Ls is equal to or greater than 42 inch.
6. The golf club shaft according to claim 1 , wherein the shaft full length Ls is equal to or less than 47 inch.
7. The golf club shaft according to claim 1 , wherein the shaft weight is equal to or greater than 30 g.
8. The golf club shaft according to claim 1 , wherein a weight of the butt partial layer is 5% by weight or greater and 50% by weight or less based on the shaft weight.
9. The golf club shaft according to claim 1 , wherein a fiber elastic modulus of the butt partial layer is equal to or greater than 5 t/mm 2 .
10. The golf club shaft according to claim 1 , wherein a resin content of the butt partial layer is 20% by weight or greater and 50% by weight or less.
11. The golf club shaft according to claim 1 , wherein if a point separated by 250 mm from a butt end Bt is defined as P 2 , and a range from the point P 2 to the butt end Bt is defined as a specific butt range, the shaft outer diameter in the specific butt range is 11 mm or greater and 17 mm or less.
12. The golf club shaft according to claim 1 , wherein if a point separated by 250 mm from a butt end Bt is defined as P 2 , and a range from the point P 2 to the butt end Bt is defined as a specific butt range, the shaft thickness in the specific butt range is 0.4 mm or greater and 1.3 mm or less.
13. The golf club shaft according to claim 1 , wherein a forward flex F 1 is 125 mm or greater and 155 mm or less.
14. The golf club shaft according to claim 1 , wherein a backward flex F 2 is 118 mm or greater and 145 mm or less.
15. The golf club shaft according to claim 1 , wherein a flex point ratio C 1 of the shaft is 38% or greater and 50% or less.
16. The golf club shaft according to claim 1 , wherein Lg/Ls is equal to or greater than 0.54.
17. The golf club shaft according to claim 1 , wherein the shaft weight is equal to or less than 49 g.
18. The golf club shaft according to claim 1 , wherein the shaft weight is less than 50 g.