Golf club head with vertical center of gravity adjustment
Golf club heads include at least one weight port situated to retain weights and positioned above an approximate club face geometric center with the club in a standard address position. One, two, or more weight ports can be located above the club face center in a club crown or other portion of a club body. Club head vertical center of gravity can be selected to compensate dynamic loft associated with locating the club head center of gravity well behind the club face. Three-dimensional adjustment of club head center of gravity is possible.
1. A wood-type golf club head comprising:
a body comprising a face positioned at a forward portion of the golf club head, the face being at least partially composed of a composite material, a sole positioned at a bottom portion of the golf club head, a crown positioned at a top portion of the golf club head and a skirt positioned around a periphery of the golf club head between the sole and crown, wherein the body defines an interior cavity;
wherein the head has a face center positioned on the face at an approximate geometric center of the face, the face center including an x-axis tangential to the face and generally parallel to the ground when the head is ideally positioned, a y-axis generally perpendicular to the x-axis and generally parallel to the ground when the head is ideally positioned, and a z-axis generally perpendicular to the x-axis and to the y-axis and generally perpendicular to the ground when the head is ideally positioned, the head having a center of gravity whose location can be defined relative to the x-axis, y-axis and z-axis; and
a plurality of weight ports formed in the body, the plurality of weight ports being arranged on the body to selectively receive and retain one or more weights to displace the center of gravity;
wherein the center of gravity of the head is situated at a predetermined head origin y-coordinate that provides dynamic loft, and at a head origin z-coordinate that at least partially compensates for dynamic loft;
wherein the plurality of weight ports includes first and second weight ports;
wherein the head has a moment of inertia about the z-axis of between about 250 Kg·mm 2 and about 650 Kg·mm 2 , wherein the crown has a crown areal weight between about 0.15 g/cm 2 and about 0.45 g/cm 2 ;
wherein the first weight port has a head origin y-axis coordinate greater than about 80 mm and less than about 130 mm and the second weight port is positioned forward of the center gravity and has a negative head origin z-axis coordinate.
2. The club head of claim 1 wherein the face has a variable thickness including a maximum face thickness no more than 6.0 mm and minimum face thickness.
3. The club head of claim 2 wherein the maximum face thickness is no less than 4.0 mm.
4. The club head of claim 3 wherein the minimum face thickness is no less than 2.5 mm.
5. The club head of claim 4 wherein the maximum face thickness is no more than 5.4 mm.
6. The club head of claim 4 wherein the club head has an aspect ratio between about 0.45 and about 0.58.
7. The club head of claim 3 wherein the club head has an aspect ratio between about 0.45 and about 0.58.
8. The club head of claim 1 wherein the second weight port is positioned heel-ward of the first weight port.
9. The club head of claim 1 wherein the club head has an aspect ratio between about 0.45 and about 0.58.
10. The club head of claim 9 wherein the aspect ratio is about 0.49 to about 0.54.
11. A wood-type golf club head comprising:
a body comprising a face positioned at a forward portion of the golf club head, the face being at least partially composed of a composite material, a sole positioned at a bottom portion of the golf club head, a crown positioned at a top portion of the golf club head and a skirt positioned around a periphery of the golf club head between the sole and crown, wherein the body defines an interior cavity;
wherein the head has a face center positioned on the face at an approximate geometric center of the face, the face center including an x-axis tangential to the face and generally parallel to the ground when the head is ideally positioned, a y-axis generally perpendicular to the x-axis and generally parallel to the ground when the head is ideally positioned, and a z-axis generally perpendicular to the x-axis and to the y-axis and generally perpendicular to the ground when the head is ideally positioned, the head having a center of gravity whose location can be defined relative to the x-axis, y-axis and z-axis; and
a plurality of weight ports formed in the body, the plurality of weight ports being arranged on the body to selectively receive and retain one or more weights to displace the center of gravity;
wherein the center of gravity of the head is situated at a predetermined head origin y-coordinate that provides dynamic loft, and at a head origin z-coordinate that at least partially compensates for dynamic loft;
wherein the plurality of weight ports includes first and second weight ports; wherein the head has a moment of inertia about the z-axis of between about 250 Kg·mm 2 and about 650 Kg·mm 2 ;
wherein the club head has an aspect ratio between about 0.45 and about 0.58.
12. The club head of claim 11 wherein the face has a variable thickness including a maximum face thickness and minimum face thickness;
wherein the maximum face thickness is about 4.0 mm to about 6.0 mm.
13. The club head of claim 11 wherein the first weight port has a head origin y-axis coordinate greater than about 80 mm and less than about 130 mm and the second weight port is positioned forward of the center gravity and has a negative head origin z-axis coordinate.
14. The club head of claim 11 wherein the crown has an areal weight between about 0.15 g/cm 2 and about 0.45 g/cm 2 .
15. A wood-type golf club head comprising:
a body comprising a face positioned at a forward portion of the golf club head, a sole positioned at a bottom portion of the golf club head, a crown positioned at a top portion of the golf club head and a skirt positioned around a periphery of the golf club head between the sole and crown, wherein the body defines an interior cavity;
wherein the head has a face center positioned on the face at an approximate geometric center of the face, the face center including an x-axis tangential to the face and generally parallel to the ground when the head is ideally positioned, a y-axis generally perpendicular to the x-axis and generally parallel to the ground when the head is ideally positioned, and a z-axis generally perpendicular to the x-axis and to the y-axis and generally perpendicular to the ground when the head is ideally positioned, the head having a center of gravity whose location can be defined relative to the x-axis, y-axis and z-axis; and
a plurality of weight ports formed in the body, the plurality of weight ports being arranged on the body to selectively receive and retain one or more weights to displace the center of gravity;
wherein the center of gravity of the head is situated at a predetermined head origin y-coordinate that provides dynamic loft, and at a head origin z-coordinate that at least partially compensates for dynamic loft;
wherein the plurality of weight ports includes first and second weight ports;
wherein the first weight port has a head origin y-axis coordinate greater than about 80 mm and less than about 130 mm and the second weight port is positioned forward of the center gravity and has a negative head origin z-axis coordinate;
wherein the face has a variable thickness including a maximum face thickness and minimum face thickness;
wherein the minimum face thickness is between about 1.5 mm and about 2.5 mm and the maximum face thickness is between about 3.0 mm and 4.0 mm;
wherein the club head has an aspect ratio between about 0.45 and about 0.58.
16. The club head of claim 15 wherein the club head has a crown areal weight between about 0.15 g/cm 2 and about 0.45 g/cm 2 .
17. The club head of claim 16 wherein the club head has a moment of inertia about the z-axis of between about 250 Kg·mm 2 and about 650 Kg·mm 2 and a moment of inertia about the x-axis of between about 140 Kg·mm 2 and about 500 Kg·mm 2 .
18. The club head of claim 15 wherein the second weight port is positioned heel-ward of the first weight port.
19. The club head of claim 18 wherein the wood-type golf club head is formed from a combination of an alloy of titanium, an alloy of aluminum, and a composite material.