GOLF CLUB

摘要

The club length of a golf club is 43 inches or greater and 48 inches or less. A club inertia moment Ix about a swing axis is equal to or less than 6.90×103 (kg·cm2). A ratio (Ihs/Ix) is equal to or greater than 0.88, if a head inertia moment about the swing axis is defined as Ihs (kg·cm2). The inertia moment Ix (kg·cm2) is calculated by Equation (1) below, and the inertia moment Ihs (kg·cm2) is calculated by Equation (2) below:;Ix=Wc×(Lc+60)2+Ic  (1);Ihs=Wh×(Lh+60)2+Ih  (2).

主权项

1. A golf club comprising:
a head having a head weight defined as Wh (kg); a shaft comprising a grip end, a tip end opposite of the grip end, and a shaft axis extending in an axial direction; a grip; a club weight defined as Wc (kg); a club length greater than or equal to 43 in and less than or equal to 48 in; an axial direction distance between the grip end of the shaft and a center of gravity of the golf club defined as Lc (cm); an axial direction distance between the grip end of the shaft and a center of gravity of the head defined as Lh (cm); a club moment of inertia about an axis parallel to a virtual axis of swing and passing through the center of gravity of the golf club defined as Ic (kg·cm2); a club moment of inertia about the virtual axis of swing defined as Ix (kg·cm2) and calculated by the following formula (1):
Ix=Wc×(Lc+60)2+Ic  (1) a head moment of inertia about an axis parallel to the virtual axis of swing and passing through the center of gravity of the head defined as Ih (kg·cm2); and a head moment of inertia about the virtual axis of swing defined as Ihs (kg·cm2) and calculated by the following formula (2):
Ihs=Wh×(Lh+60)2+Ih  (2) wherein a ratio Ihs/Ix is equal to or greater than 0.88.