Golf club

Abstract

A golf club includes a head, a shaft, and a grip. The head has a center-of-gravity depth of greater than or equal to 23.5 mm. The head has a center-of-gravity distance of less than or equal to 39 mm. The shaft has a forward flex of greater than or equal to 110 mm. When f1 denotes the forward flex of the shaft and f2 denotes a backward flex of the shaft, f2/f1 may be greater than or equal to 0.8 and less than or equal to 0.9. The head may have a volume of greater than or equal to 380 cc. The shaft may have a weight of less than or equal to 50 g.

What is claimed is: 
     
         1 . A golf club comprising:
 a head;   a shaft; and   a grip, wherein   the head has a center-of-gravity depth of greater than or equal to 23.5 mm,   the head has a center-of-gravity distance of less than or equal to 39 mm,   the shaft has a forward flex of greater than or equal to 110 mm,   the head has a volume of greater than or equal to 380 CC,   wherein the shaft has a shaft torque of greater than or equal to 5.3 degrees,   wherein the shaft torque is a torsional angle formed when a torque of 13.9 kg·cm is applied to a portion of the shaft extending from a first position spaced 40 mm apart from a tip end of the shaft to a second position 825 mm apart from the first position.   
     
     
         2 . The golf club according to  claim 1 , wherein the head has a weight of less than or equal to 202 g. 
     
     
         3 . The golf club according to  claim 1 , wherein the golf club has a weight of greater than or equal to 270 g. 
     
     
         4 . The golf club according to  claim 1 , wherein the center-of-gravity distance is a distance between a center line of the shaft and a center of gravity of the head measured in a front view of the head. 
     
     
         5 . The golf club according to  claim 4 , wherein the center-of-gravity depth is a distance between the center line of the shaft and the center of gravity of the head measured in a face-back direction. 
     
     
         6 . A golf club comprising:
 a head;   a shaft; and   a grip, wherein   the head has a center-of-gravity depth of greater than or equal to 23.5 mm,   the head has a center-of-gravity distance of less than or equal to 39 mm,   the shaft has a forward flex of greater than or equal to 110 mm,   wherein the head has a weight of less than or equal to 202 g,   wherein the shaft has a shaft torque of greater than or equal to 5.3 degrees,   wherein the shaft torque is a torsional angle formed when a torque of 13.9 kg·cm is applied to a portion of the shaft extending from a first position spaced 40 mm apart from a tip end of the shaft to a second position 825 mm apart from the first position.   
     
     
         7 . The golf club according to  claim 6 , wherein the golf club has a weight of greater than or equal to 270 g. 
     
     
         8 . The golf club according to  claim 7 , wherein the center-of-gravity distance is a distance between a center line of the shaft and a center of gravity of the head measured in a front view of the head. 
     
     
         9 . The golf club according to  claim 8 , wherein the center-of-gravity depth is a distance between the center line of the shaft and the center of gravity of the head measured in a face-back direction. 
     
     
         10 . A golf club comprising:
 a head;   a shaft; and   a grip, wherein   the head has a center-of-gravity depth of greater than or equal to 23.5 mm,   the head has a center-of-gravity distance of less than or equal to 39 mm,   the shaft has a forward flex of greater than or equal to 110 mm,   wherein the shaft has a shaft torque of greater than or equal to 5.3 degrees,   wherein the shaft torque is a torsional angle formed when a torque of 13.9 kg·cm is applied to a portion of the shaft extending from a first position spaced 40 mm apart from a tip end of the shaft to a second position 825 mm apart from the first position.   
     
     
         11 . The golf club according to  claim 10 , wherein the center-of-gravity distance is a distance between a center line of the shaft and a center of gravity of the head measured in a front view of the head. 
     
     
         12 . The golf club according to  claim 11 , wherein the center-of-gravity depth is a distance between the center line of the shaft and the center of gravity of the head measured in a face-back direction.