Golf club head with improved inertia performance
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), all combined with a high MOI about the X and Y-axis (MOI-X and MOI-Y) and maintaining a consistently and relatively low CG location measured along a direction tangent to the hosel axis along the X-Y plane (CG-B).
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 comprises:
a frontal portion further comprising a striking face having a face center, located at a forward portion of said golf club head; and
a rear portion located aft of said striking face comprising a crown at an upper portion of said golf club and a sole on a bottom portion of said golf club;
wherein an x-axis is defined as a horizontal axis tangent to said face center with the positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to said x-axis with a positive direction towards said crown of said golf club head, and a z-axis being orthogonal to both the x-axis and the y-axis with a positive direction towards said frontal portion of said golf club head; and
a generally planar central support member oriented generally perpendicular to the x-axis and having a maximum height parallel to the y-axis and a maximum depth parallel to the z-axis and the maximum depth is greater than the maximum height,
the central support member comprising a first angled strut member extending from said crown of said golf club head to said sole of said golf club head and a second angled strut member extending from said sole of said golf club head to said crown of said golf club head,
wherein said first and second angled strut members cross each other.
2. The golf club of claim 1 , wherein said first and second angled strut members extend at an angle of between 15 degrees and 75 degrees from both the y-axis and the z-axis.
3. The golf club of claim 2 , wherein said central support member further comprises a third angled strut member extending from said crown of said golf club head to said sole of said golf club head and a fourth angled strut member extending from said sole of said golf club head to said crown of said golf club head, wherein said third and fourth angled strut members cross each other.
4. The golf club of claim 3 , wherein said third and fourth angled strut members extend at an angle of between 15 degrees and 75 degrees from both the y-axis and the z-axis and said third angled strut member is coupled to said first angled strut member and said fourth angled strut member is coupled to said second angled strut member.
5. The golf club head of claim 4 , further comprising:
at least one first weighting member located substantially in line with a vertical plane extending through said face center and along the z-axis.
6. The golf club of claim 5 , wherein said first angled strut member is coupled to said sole of said golf club head adjacent to said first weighting member.
7. The golf club of claim 6 , further comprising:
a second weighting member located substantially in line with the vertical plane extending through said face center and along the z-axis.
8. The golf club of claim 7 , wherein said third angled strut member is coupled to said sole of said golf club head adjacent said second weighting member.
9. The golf club of claim 8 , wherein said central support member further comprises a vertical strut member extending vertically between said fourth angled strut member and said third angled strut member.
10. The golf club of claim 1 , wherein said golf club head has a moment of inertia about the z-axis (MOI-Z) passing through a center of gravity (CG) of said golf club head of less than about 268 kg-mm 2 , and
wherein said golf club head has a moment of inertia about the y-axis (MOI-Y) passing through the CG of greater than about 420 kg-mm 2 , and
wherein said golf club head has a moment of inertia about a shaft axis (MOI-SA) of less than about 850 kg-mm 2 .
11. 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 comprises:
a frontal portion further comprising a striking face having a face center, located at a forward portion of said golf club head, wherein at least a portion of said frontal portion comprises titanium; and
a rear portion located aft of said striking face comprising a crown at an upper portion of said golf club head and a sole on a bottom portion of said golf club head, wherein at least a portion of said rear portion comprises a composite material;
wherein an x-axis is defined as a horizontal axis tangent to said face center with the positive direction towards a heel of said golf club head, a y-axis is a vertical axis orthogonal to the x-axis with a positive direction towards said crown of said golf club head, and a z-axis being orthogonal to both the x-axis and the y-axis with a positive direction towards said frontal portion of said golf club head; and
a generally planar central support member oriented generally perpendicular to the x-axis and comprising a first angled strut member extending from said crown of said golf club head to said sole of said golf club head and a second angled strut member extending from said sole of said golf club head to said crown of said golf club head,
wherein said first and second angled strut members cross each other, and
wherein said first and second angled strut members extend at an angle of between 15 degrees and 75 degrees from both the y-axis and the z-axis.
12. The golf club of claim 11 , wherein said central support member further comprises a third angled strut member extending from said crown of said golf club head to said sole of said golf club head and a fourth angled strut member extending from said sole of said golf club head to said crown of said golf club head, wherein said third and fourth angled strut members cross each other.
13. The golf club of claim 12 , wherein said third and fourth angled strut members extend at an angle of between 15 degrees and 75 degrees from both the y-axis and the z-axis and said third angled strut member is coupled to said first angled strut member and said fourth angled strut member is coupled to said second angled strut member.
14. The golf club head of claim 13 , further comprising:
at least one first weighting member located substantially in line with a vertical plane extending through said face center and along the z-axis.
15. The golf club of claim 14 , wherein said first angled strut member is coupled to said sole adjacent to said first weighting member.
16. The golf club of claim 15 , further comprising:
a second weighting member located substantially in line with a vertical plane extending through said face center and along the z-axis, and located adjacent to a back edge of said golf club.
17. The golf club of claim 16 , wherein said third angled strut member is coupled to said sole of said golf club head adjacent said second weighting member.
18. The golf club of claim 17 , wherein said central support member further comprises a vertical strut member extending vertically between said fourth angled strut member and said third angled strut member.
19. The golf club of claim 11 , wherein said golf club head has a moment of inertia about the z-axis (MOI-Z) passing through a center of gravity (CG) of said golf club head
wherein said golf club head has a moment of inertia about the x-axis (MOI-X) passing through the CG and the ratio of MOI-X to MOI-Z is greater than 1.1.