Golf club

Abstract

A golf club head includes a club body including a heel portion, a sole portion, a toe portion, a top-line portion, and a face portion. In some embodiments, the face portion has an ideal striking location and at least one channel defined in the face. In some embodiments, the golf club head has a striking face and at least one channel defined in the striking face. In some embodiments, the golf club head has an ideal striking location and at least one non-ideal striking location.

That which is claimed is: 
     
         1 . A golf club head comprising:
 a club body including a heel portion, a sole portion, a toe portion, a top-line portion, and a face portion and having an ideal strike location and at least one non-ideal strike location, each non-ideal strike location being about 10 mm from the ideal strike location on an x-axis defined parallel to a ground plane and passing through the ideal strike location;   wherein a coefficient of restitution at the ideal strike location is not more than 0.035 greater than a coefficient of restitution at each non-ideal strike location.   
     
     
         2 . The golf club head of  claim 1 , wherein the coefficient of restitution at the ideal strike location is not more than 0.010 greater than the coefficient of restitution at each non-ideal strike location. 
     
     
         3 . The golf club head of  claim 1 , wherein the coefficient of restitution at the ideal strike location is at least 0.810. 
     
     
         4 . The golf club head of  claim 1 , wherein the face portion includes a non-deal strike location being 15 mm from the ideal strike location proximate the toe portion along the x-axis, wherein the coefficient of restitution at the ideal strike location is not more than 0.080 greater than a coefficient of restitution at the non-ideal strike location 15 mm from the ideal strike location. 
     
     
         5 . The golf club head of  claim 4 , wherein the coefficient of restitution at the ideal strike location is not more than 0.060 greater than the coefficient of restitution at the non-ideal strike location 15 mm from the ideal strike location. 
     
     
         6 . The golf club head of  claim 1 , wherein the golf club head includes at least one flexible boundary structure. 
     
     
         7 . The golf club head of  claim 6 , wherein at least one face-located flexible boundary structure is defined as a feature of the face portion; and at least one sole-located flexible boundary structure is defined as a feature of the sole portion. 
     
     
         8 . The golf club head of  claim 1 , wherein the golf club head includes a primary mode that is within 20 mm of the ideal strike location.