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 head comprising:
a frontal portion further comprising a striking face that helps define a face center, located at a forward portion of said golf club head;
a rear portion located aft of said striking face,
wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said striking face with a 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 a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards said frontal portion of said golf club head; and
at least one first weighting member located substantially in line with a vertical plane extending through said face center and along the z-axis,
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, and said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG,
wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.68,
wherein said golf club head has a MOI-Y measurement of greater than about 420 kg-mm 2 ,
wherein said golf club head has a MOI-X measurement of greater than about 300 kg-mm 2 , and
wherein said golf club head has a moment of inertia about a shaft axis (MOI-SA) measurement of less than about 800 kg-mm 2 .
2. The golf club of claim 1 , wherein said golf club head has MOI-X and MOI-SA numbers that satisfy the equation below:
MOI-X≥(0.40*MOI-SA)+50.
3. The golf club of claim 1 , wherein said golf club head has MOI-Y and MOI-SA numbers that satisfy the equation below:
MOI-Y≥(0.52*MOI-SA)+147.
4. The golf club of claim 1 , wherein said golf club has MOI-Z, CG-B, and Face Width numbers that satisfy the equation below:
MOI
-
Z
≤
(
1
0
0
0
*
CG
-
B
Face
Width
)
-
1
5
0
.
5. The golf club head of claim 1 , wherein said MOI-X measurement is greater than about 310 kg-mm 2 .
6. The golf club head of claim 5 , wherein said MOI-X measurement is greater than about 320 kg-mm 2 .
7. The golf club head of claim 1 , wherein said golf club head has a CG-B measurement of between about 32 mm and about 39 mm.
8. The golf club of claim 1 , wherein said golf club head has an MOI-X to MOI-Z ratio of greater than about 1.10.
9. The golf club of claim 1 , wherein when said golf club has an MOI-Z measurement of less than 320 kg-mm 2 , said golf club has a ratio of CG-B/Head Width of greater than about 0.34.
10. A golf club head comprising:
a frontal portion further comprising a striking face that helps define a face center, located at a forward portion of said golf club head;
a rear portion located aft of said striking face,
wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said striking face with a 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 a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards said frontal portion of said golf club head; and
at least one first weighting member located substantially in line with a vertical plane extending through said face center and along the z-axis,
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, and said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG,
wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.50,
wherein said golf club head has a MOI-Z measurement of less than about 268 kg-mm 2 ,
wherein said golf club head has a MOI-Y measurement of greater than about 400 kg-mm 2 , and
wherein said golf club head has a moment of inertia about a shaft axis (MOI-SA) measurement of less than about 850 kg-mm 2 .
11. The golf club head of claim 10 , wherein said MOI-Y measurement is greater than about 410 kg-mm 2 .
12. The golf club head of claim 11 , wherein said MOI-Y measurement is greater than about 420 kg-mm 2 .
13. The golf club of claim 10 , wherein said golf club head has MOI-X and MOI-SA numbers that satisfy the equation below:
MOI-X≥(0.40*MOI-SA)+50.
14. The golf club of claim 10 , wherein said golf club head has MOI-Y and MOI-SA numbers that satisfy the equation below:
MOI-Y≥(0.52*MOI-SA)+147.
15. The golf club of claim 10 , wherein said golf club has MOI-Z, CG-B, and Face Width numbers that satisfy the equation below:
MOI
-
Z
≤
(
1
0
0
0
*
CG
-
B
Face
Width
)
-
1
5
0
.
16. The golf club head of claim 10 , wherein said golf club head has a CG-B measurement of between about 32 mm and about 39 mm.
17. The golf club of claim 10 , wherein said golf club head has an MOI-X to MOI-Z ratio of greater than about 1.10.
18. The golf club of claim 10 , wherein when said golf club has an MOI-Z measurement of less than 320 kg-mm 2 , said golf club has a ratio of CG-B/Head Width of greater than about 0.34.
19. The golf club head of claim 10 , wherein said golf club head further comprises a second weighting member located rearward of said first weighting member and substantially in line with said vertical plane extending through said face center and along the z-axis,
wherein said frontal portion comprises a first material having a first density,
wherein said rear portion comprises a second material having a second density,
wherein said first weighting member and said second weighting member both comprise a third material having a third density, and
wherein said third density is greater than said first density and said second density.
20. A golf club head comprising:
a frontal portion further comprising a striking face that helps define a face center, located at a forward portion of said golf club head, wherein said frontal portion comprises a first material having a first density;
a rear portion located aft of said striking face, wherein said rear portion comprises a second material have a second density,
wherein an x-axis is defined as a horizontal axis tangent to a geometric center of said striking face with a 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 a crown of said golf club head, and a z-axis being orthogonal to both said x-axis and said y-axis with a positive direction towards said frontal portion of said golf club head;
at least one first weighting member located substantially in line with a vertical plane extending through said face center and along the z-axis; and
a second weighting member located rearward of said first weighting member and substantially in line with said vertical plane extending through said face center and along the z-axis,
wherein said first weighting member and said second weighting member both comprise a third material having a third density,
wherein said third density is greater than said first density and said second density,
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, and said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG,
wherein said golf club head has a MOI-Y measurement of greater than about 400 kg-mm 2 ,
wherein said golf club head has a moment of inertia about a shaft axis (MOI-SA) measurement of less than about 850 kg-mm 2 ,
wherein said golf club head has a MOI-Y to MOI-Z ratio of greater than about 1.50,
wherein said golf club head has an MOI-X to MOI-Z ratio of greater than about 1.10,
wherein said golf club head has a CG-B measurement of between about 32 mm and about 39 mm,
wherein said golf club head has a CG-C measurement of between about 10 mm and about 25 mm, and
wherein when said golf club has an MOI-Z measurement of less than 320 kg-mm 2 , said golf club has a ratio of CG-B/Head Width of greater than about 0.34.