Golf club head with improved inertia performance

Abstract

A golf club head that is capable improving on the inertia properties of a golf club head all while also improving the Center of Gravity (CG) location is disclosed herein. More specifically, the golf club head in accordance with the present invention achieves a relative low Moment of Inertia (MOI) about the Z-axis (MOI-Z) as well as a relatively low MOI about the Shaft-axis (MOI-SA).

What is claimed is: 
     
         1 . A golf club comprised of a golf club head, a shaft having a shaft axis coupled to the golf club head at a first end of the shaft and a grip coupled to the shaft at a second end of the shaft, wherein the golf club head defines a heel and a toe comprises:
 a frontal portion comprised of titanium comprising a striking face having a face center located at a forward portion of said golf club head, a crown return and a sole return;   a rear portion located aft of said striking face comprising a crown at an upper portion of said golf club head being coupled to the crown return and a sole portion on a bottom portion of said golf club head being coupled to the sole return;   an x-axis is defined as a horizontal axis tangent to said face center with a positive x direction towards the heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive y direction towards said crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive z direction extending forward,   wherein said golf club head has a moment of inertia about said y-axis (MOI-Y) passing through a center of gravity (CG) of said golf club head, said golf club head has a moment of inertia about said z-axis (MOI-Z) passing through said CG, said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG and said golf club has a moment of inertia about the shaft axis (MOI-SA);   a first weighting member and a second weighting member, the first weighting member located on the sole return and the second weighting member being located on said rear portion, near a back edge of the golf club head;   wherein said first weighting member and said second weighting member are interchangeable to move the CG of the golf club head between a forward position having a CG-C of between 14 mm to 23 mm and an aft position having a second CG-C of between 22 mm and 30 mm,   wherein a difference in MOI-Y between said forward position and said aft position is less than about 150 kg-mm 2 , and   wherein a MOI-Y of said golf club head in said aft position is greater than about 900 kg-mm 2 .   
     
     
         2 . The golf club head of  claim 1 , wherein said difference in MOI-Y between said forward position and said aft position is less than about 145 kg-mm 2 . 
     
     
         3 . The golf club head of  claim 2 , wherein said difference in MOI-Y between said forward position and said aft position is less than about 140 kg-mm 2 . 
     
     
         4 . The golf club head of  claim 1 , wherein said golf club head has a volume of greater than about 445 cc. 
     
     
         5 . The golf club head of  claim 4 , wherein said golf club head has a volume of greater than about 450 cc. 
     
     
         6 . The golf club head of  claim 5 , wherein said golf club head has a volume of greater than about 455 cc. 
     
     
         7 . The golf club head of  claim 1 , wherein said golf club head has a Silhouette Area of greater than about 14,000 mm 2 . 
     
     
         8 . The golf club head of  claim 7 , wherein said Silhouette Area of said golf club head is greater than about 14,500 mm 2 . 
     
     
         9 . The golf club head of  claim 8 , wherein said Silhouette Area of said golf club head is greater than about 15,000 mm 2 . 
     
     
         10 . The golf club head of  claim 1 , wherein said golf club head has a Silhouette Width of greater than about 135.0 mm. 
     
     
         11 . The golf club head of  claim 10 , wherein said Silhouette Width of said golf club head is greater than about 137.5 mm. 
     
     
         12 . The golf club head of  claim 11 , wherein said Silhouette Width of said golf club head is greater than about 140.0 mm. 
     
     
         13 . The golf club head of  claim 10 , wherein said golf club head has a Silhouette Depth of greater than about 115.0 mm. 
     
     
         14 . The golf club head of  claim 13 , wherein said Silhouette Depth of said golf club head is greater than about 117.5 mm. 
     
     
         15 . The golf club head of  claim 14 , wherein said Silhouette Depth of said golf club head is greater than about 120.0 mm. 
     
     
         16 . A golf club comprised of a golf club head, a shaft having a shaft axis coupled to the golf club head at a first end of the shaft and a grip coupled to the shaft at a second end of the shaft, wherein the golf club head defines a heel and a toe comprises:
 a frontal portion comprised of titanium comprising a striking face having a face center located at a forward portion of said golf club head, a crown return and a sole return;   a rear portion located aft of said striking face comprising a crown at an upper portion of said golf club head being coupled to the crown return and a sole portion on a bottom portion of said golf club head being coupled to the sole return;   an x-axis is defined as a horizontal axis tangent to said face center with a positive x direction towards the heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive y direction towards said crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive z direction extending forward,   wherein said golf club head has a moment of inertia about said y-axis (MOI-Y) passing through a center of gravity (CG) of said golf club head, said golf club head has a moment of inertia about said z-axis (MOI-Z) passing through said CG, said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG and said golf club has a moment of inertia about the shaft axis (MOI-SA);   a first weighting member and a second weighting member, the first weighting member located on the sole return and the second weighting member being located on said rear portion, near a back edge of the golf club head;   wherein said first weighting member and said second weighting member are interchangeable to move the CG of the golf club head between a forward position having a CG-C of between 14 mm to 23 mm and an aft position having a second CG-C of between 22 mm and 30 mm;   wherein a difference in MOI-Y between said forward position and said aft position is less than about 150 kg-mm 2 , and   wherein said golf club head has a Silhouette Area of greater than about 14,000 mm 2 .   
     
     
         17 . The golf club head of  claim 16 , wherein said Silhouette Area of said golf club head is greater than about 14,500 mm 2 . 
     
     
         18 . The golf club head of  claim 17 , wherein said Silhouette Area of said golf club head is greater than about 15,000 mm 2 . 
     
     
         19 . The golf club head of  claim 16 , wherein said MOI-SA of said golf club head is between about 780 kg-mm 2  and about 950 kg-mm 2 . 
     
     
         20 . The golf club head of  claim 19 , wherein said MOI-SA of said golf club head is between about 790 kg-mm 2  and about 950 kg-mm 2 .