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; and
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, and
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-Z measurement of less than about 268 kg-mm 2 ,
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 320 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 head of claim 1 , wherein if said MOI-Y measurement is greater than about 500, said MOI-Z measurement is governed by the equation;
MOI- Z ≤(0.47*MOI- Y )+33.
3. The golf club head of claim 1 , wherein said golf club head has a MOI-X to MOI-Z ratio of greater than about 1.10.
4. The golf club head of claim 3 , wherein said MOI-X to MOI-Z ratio is greater than about 1.20.
5. The golf club head of claim 4 , wherein said MOI-X to MOI-Z ratio is greater than about 1.28.
6. The golf club head of claim 1 , 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.
7. 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 x-axis (MOI-X) passing through a center of gravity (CG) of said golf club head, a moment of inertia about said y-axis (MOI-Y) passing through the CG of the golf club head, a moment of inertia about said z-axis (MOI-Z) passing through the CG of said golf club head, and a CG-Z being a distance from said face center to said CG along said z-axis,
wherein said golf club head has MOI-X, MOI-Y, MOI-Z, and CG-Z numbers that satisfy the equations below;
(
MOI
-
X
MOI
-
Z
)
*
1
0
0
≥
(
6
.
7
5
0
1
*
CG
-
Z
)
-
9
9
.
3
0
,
(
MOI
-
Y
MOI
-
Z
)
*
1
0
0
≥
(
1
1
.
3
4
9
*
CG
-
Z
)
-
1
7
5
.
7
6
,
(
MOI
-
X
+
MOI
-
Y
MOI
-
Z
)
*
1
0
0
≥
(
1
8
.
6
7
*
CG
-
Z
)
-
2
9
6
.
6
3
,
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 420 kg-mm 2 ,
wherein said golf club head has a MOI-X measurement of greater than about 320 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 .
8. The golf club head of claim 7 , wherein said golf club head has a CG-Z measurement of between about 25 mm and about 40 mm.
9. The golf club head of claim 8 , wherein said CG-Z measurement is between about 26 mm and about 38 mm.
10. The golf club head of claim 9 , wherein said CG-Z measurement is between about 27 mm and about 36 mm.
11. The golf club head of claim 7 , 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.
12. The golf club head of claim 11 , wherein said frontal portion is made out of a first material having a first density,
wherein said rear portion is made out of a second material having a second density,
wherein said first weighting member and said second weighting member are both made out of a third material having a third density, and
wherein said third density is greater than said first and said second density.
13. The golf club head of claim 12 , wherein said first density is greater than said second density.
14. 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 x-axis (MOI-X) passing through a center of gravity (CG) of said golf club head, a moment of inertia about said y-axis (MOI-Y) passing through the CG of the golf club head, a moment of inertia about said z-axis (MOI-Z) passing through the CG of said golf club head, and a CG-Z being a distance from said face center to said CG along said z-axis,
wherein said golf club head has MOI-X, MOI-Y, MOI-Z, and CG-Z numbers that satisfy the equation below;
(
MOI
-
X
MOI
-
Z
)
*
1
0
0
≥
(
6
.
7
5
0
1
*
CG
-
Z
)
-
9
9
.
3
0
,
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 420 kg-mm 2 ,
wherein said golf club head has a MOI-X measurement of greater than about 320 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 .
15. The golf club head of claim 14 ,
wherein said MOI-X, MOI-Y, MOI-Z, and CG-Z numbers satisfy the equation below;
MOI
-
Y
MOI
-
Z
*
100
≥
(
1
1
.
3
4
9
*
CG
-
Z
)
-
1
7
5
.
7
6
.
16. The golf club head of claim 14 , wherein said MOI-X, MOI-Y, MOI-Z, and CG-Z numbers satisfy the equation below;
(
MOI
-
X
+
MOI
-
Y
)
MOI
-
Z
*
100
≥
(
1
8
.
6
7
*
CG
-
Z
)
-
2
9
6
.
6
3
.
17. The golf club head of 14 , wherein said golf club head has a CG-Z measurement of between about 25 mm and about 40 mm.
18. The golf club head of claim 17 , wherein said CG-Z measurement is between about 26 mm and about 38 mm.
19. The golf club head of claim 18 , wherein said CG-Z measurement is between about 27 mm and about 36 mm.
20. The golf club head of claim 14 , 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.