Golf club
A golf club head includes a club body including a crown, a sole, a skirt disposed between and connecting the crown and the sole and a face portion connected to a front end of the club body. The face portion includes a geometric center defining the origin of a coordinate system when the golf club head is ideally positioned, the coordinate system including an x-axis being tangent to the face portion at the origin and parallel to a ground plane, a y-axis intersecting the origin being parallel to the ground plane and orthogonal to the x-axis, and a z-axis intersecting the origin being orthogonal to both the x-axis and the y-axis. The golf club head defines a center of gravity CG, the CG being a distance CG Y from the origin as measured along the y-axis and a distance CG Z from the origin as measured along the z-axis.
1. A golf club head comprising:
a club body including a leading edge, a trailing edge, a crown, a sole, and a skirt disposed between and connecting the crown and the sole;
an adjustable head-shaft connection assembly coupled to the club body and operable to adjust at least one of a loft angle or a lie angle of a golf club formed when the golf club head is attached to a golf club shaft via the head-shaft connection assembly;
at least one external mass element that is adjustably attachable to the club body; and
a face portion connected to a front end of the club body, the face portion including a geometric center defining the origin of a coordinate system when the golf club head is ideally positioned, the coordinate system including:
an x-axis being tangent to the face portion at the origin and parallel to a ground plane,
a y-axis intersecting the origin being parallel to the ground plane and orthogonal to the x-axis, and
a z-axis intersecting the origin being orthogonal to both the x-axis and the y-axis;
the golf club head defining a center of gravity (CG), the CG being a distance CG Y from the origin as measured along the y-axis and a distance CG Z from the origin as measured along the z-axis;
wherein the golf club head has a crown height to face height ratio of at least 1.12 and
wherein the golf club head has a moment of inertia (I XX ) about a CG x-axis, the CG x-axis being parallel to the x-axis and passing through the CG of the golf club head, wherein a ratio of CG Z /CG Y satisfies the inequality:
CG Z /CG Y <0.000222 ×I XX −0.272;
wherein there is a face-to-crown transition where the face connects to the crown near the front end of the club body and a skirt-to-crown transition where the skirt connects to the crown;
wherein in a y-z plane passing through the origin the crown height continuously increases starting from the face-to-crown transition up to a local maximum;
wherein in a y-z plane passing through the origin at a distance CG Y from the origin the crown height is greater than the face height;
wherein in a y-z plane passing through the origin the skirt-to-crown transition proximate the trailing edge is lower than the origin;
wherein a CG effectiveness product (CG eff ) for the golf club head is defined as
CG eff =CG Y ×Δ z ;
and the CG eff is at least 806 mm 2 .
2. The golf club head of claim 1 , wherein the distance CG Z is not greater than −7.0.
3. The golf club head of claim 1 , wherein the crown portion is convex at all locations.
4. The golf club head of claim 1 , further comprising at least one mass element connected to the body portion of the golf club head.
5. The golf club head of claim 1 , wherein the CG is located a distance Δ Z from a ground plane, the ground plane being defined as a plane in contact with the sole of the golf club head in ideal address position, wherein Δ Z is at most 24.6 mm, the CG Z /CG Y ratio is less than −0.25, and I XX is at least 200 kg·mm 2 .
6. The golf club head of claim 5 , wherein the CG eff is less than 1031 mm 2 .
7. The golf club head of claim 1 , wherein at least a portion of the sole located rearward of the CG is substantially flat.
8. The golf club head of claim 1 , wherein a volume of the golf club head is at least 430 cc.
9. The golf club head of claim 1 , wherein the distance CG Z is not greater than −7.0, and Δz is no greater than 24.6 mm.
10. A golf club head comprising:
a club body including a leading edge, a trailing edge, a crown, a sole, and a skirt disposed between and connecting the crown and the sole; and
a face portion connected to a front end of the club body, the face portion including a geometric center defining the origin of a coordinate system when the golf club head is ideally positioned, the coordinate system including
an x-axis being tangent to the face portion at the origin and parallel to a ground plane,
a y-axis intersecting the origin being parallel to the ground plane and orthogonal to the x-axis, and
a z-axis intersecting the origin being orthogonal to both the x-axis and the y-axis;
the golf club head defining a center of gravity CG (CG), the CG being a distance CG Y from the origin as measured along the y-axis and a distance CG Z from the origin as measured along the z-axis that is not greater than −7.0, wherein the CG is located a distance Δ Z from a ground plane that is no more than 24.6 mm, the ground plane being defined as a plane in contact with the sole of the golf club head in ideal address position; and
wherein the golf club head has a moment of inertia (I XX ) about a CG x-axis that is at least 200 kg·mm 2 , the CG x-axis being parallel to the x-axis and passing through the CG of the golf club head, wherein a ratio of CG Z /CG Y is less than −0.25 and satisfies the inequality
CG Z /CG Y <0.000222 ×I XX −0.272; and
wherein a CG effectiveness product (CG eff ) for the golf club head is defined as
CG eff =CG Y ×Δ z
and the CG eff is 806-1031 mm 2 .
11. The golf club head of claim 10 , wherein the golf club head includes a face-to-crown transition where the face connects to the crown near the front end of the club body and a skirt-to-crown transition where the skirt connects to the crown, wherein in a y-z plane passing through the origin the crown height continuously increases starting from the face-to-crown transition up to a local maximum, wherein in a y-z plane passing through the origin at a distance CGy from the origin the crown height is greater than the face height, and wherein in a y-z plane passing through the origin the skirt-to-crown transition proximate the trailing edge is lower than the origin.
12. The golf club head of claim 11 , wherein the golf club head has a crown height to face height ratio of at least 1.12.