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 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, said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG, and a moment of inertia about a shaft axis (MOI-SA) passing through said shaft axis,
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-Y measurement of greater than about 400 kg-mm 2 ,
wherein said MOI-SA of said golf club head is less than about 800 kg-mm 2 .
2 . 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.
3 . The golf club head of claim 2 , wherein said CG-B measurement of said golf club head is between about 33 mm and about 38 mm.
4 . The golf club head of claim 3 , wherein said CG-B measurement of said golf club head is about 35 mm.
5 . The golf club head of claim 1 , wherein a face width of said golf club head is between about 95 mm and about 105 mm.
6 . The golf club head of claim 5 , wherein said face width of said golf club head is between about 97 mm and about 103 mm.
7 . The golf club head of claim 6 , wherein said face width of said golf club head is about 100 mm.
8 . The golf club head of claim 1 , wherein said golf club head has MOI-X and MOI-SA numbers that satisfy the equation below:
MOI
-
X
≥
(
0.4
*
MOI
-
SA
)
+
50.
9 . 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.
10 . 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
≤
(
1000
*
CG
-
B
Face
Width
)
-
150.
11 . 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 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, said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG, and a moment of inertia about a shaft axis (MOI-SA) passing through said shaft axis,
wherein said golf club head has a MOI-Z of less than about 268 kg-mm 2 when said MOI-Y is between 420 kg-mm 2 and 500 kg-mm 2 , and
wherein said golf club head has a MOI-Z of that satisfies the relationship MOI-Z≤(0.47*MOI-Y)+0.33 when said MOI-Y is greater than 500 kg-mm 2 .
12 . The golf club head of claim 11 , wherein said golf club head has a MOI-SA measurement of less than about 850 kg-mm 2 .
13 . The golf club head of claim 12 , wherein said MOI-SA measurement of said golf club head is less than about 800 kg-mm 2 .
14 . The golf club head of claim 13 , wherein said MOI-SA measurement of said golf club head is less than about 750 kg-mm 2 .
15 . The golf club head of claim 11 , wherein said golf club head has a MOI-X measurement of greater than about 300 kg-mm 2 .
16 . The golf club head of claim 15 , wherein said MOI-X measurement of said golf club head is greater than about 310 kg-mm 2 .
17 . The golf club head of claim 16 , wherein said MOI-X measurement of said golf club head is greater than about 320 kg-mm 2 .
18 . 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 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, said golf club head has a moment of inertia about said x-axis (MOI-X) passing through said CG, and a moment of inertia about a shaft axis (MOI-SA) passing through said shaft axis,
wherein said golf club has a MOI-Z, a CG-B, and a Face Width numbers that satisfy the equation below:
MOI
-
Z
≤
(
1000
*
CG
-
B
Face
Width
)
-
150.
19 . The golf club head of claim 18 , wherein said golf club head has a MOI-Y measurement of greater than about 400 kg-mm 2 .
20 . The golf club head of claim 19 , wherein said MOI-Y measurement of said golf club head is greater than about 410 kg-mm 2 .