Golf club heads
Some disclosed golf club heads include body having at least one raised sole portion and a cantilevered ledge extending down around a perimeter of the club head below the level of the raised sole portion. Some disclosed golf club heads include one or more sole openings in the body and a sole insert that is mounted inside the body over the sole openings. The sole can include weight tracks as well, and a rear weight track can extend between a toe side sole opening and a heel side sole opening. A crown insert can also be included that is mounted over an upper opening in the body.
1. A golf club head comprising:
a front end, a rear end, a top side, a lower side, a toe side, a heel side, a hosel positioned at the heel side and defining a hosel axis, a sole positioned at the lower side, a crown positioned at the top side, and an interior cavity, wherein the golf club head has a volume of 350 cm 3 to 600 cm 3 ; and
a face positioned at the front end of the golf club head and including a striking surface; wherein:
the striking surface has a club head origin positioned at a geometric center of the striking surface;
the club head origin defines a head origin coordinate system including:
a z-axis extending through the head origin in a generally vertical direction relative to a ground plane when the golf club head is in a normal address position, and extending in a positive direction from the club head origin towards the crown of the golf club head;
an x-axis extending through the head origin in a toe-to-heel direction generally parallel to the striking surface and generally perpendicular to the z-axis, and extending in a positive direction from the club head origin toward the heel side of the golf club head; and
a y-axis extending through the head origin in a front-to- back direction and generally perpendicular to the x-axis and to the z-axis, and extending in a positive direction from the club head origin towards the rear end of the golf club head;
a golf club head center of gravity z-axis extends generally parallel to the head origin z-axis, and a ratio of a moment of inertia about the golf club head center of gravity z-axis (Izz) to the volume of the golf club head is at least 0.86 kg/m;
a golf club head center of gravity x-axis extends generally parallel to the head origin x-axis, and a ratio of a moment of inertia about the golf club head center of gravity x-axis (Ixx) to the volume of the golf club head is at least 0.596 kg/m;
a golf club head center of gravity y-axis extends generally parallel to the head origin y-axis, and a moment of inertia about the golf club head center of gravity y-axis (lyy) is at least 258 kg-mm 2 ;
at least 40% of the crown is made of a first fiber-reinforced polymeric material and at least 50% of the sole is made of a second fiber-reinforced polymeric material;
a moment of inertia about the hosel axis is at least 626 kg-mm 2 ; and
Izz is at least 400 kg-mm 2 , Ixx is at least 270 kg-mm 2 .
2. The golf club head according to claim 1 , wherein the ratio of Izz to the volume of the golf club head is at least 0.988 kg/m.
3. The golf club head according to claim 2 , wherein the ratio of Ixx to the volume of the golf club head is at least 0.672 kg/m.
4. The golf club head according to claim 3 , wherein a difference between Zup of the golf club head, defined as a distance between a center of gravity of the golf club head and a ground plane in the z-axis direction when the golf club head is in a normal address position on the ground plane, and half of a maximum head height of the golf club head is less than about −4.0 mm.
5. The golf club head according to claim 4 , wherein the difference between Zup of the golf club head and half of the maximum head height of the golf club head is less than about −5.5 mm.
6. The golf club head according to claim 3 , wherein:
the moment of inertia about the hosel axis is at least 2.5 times greater than Iyy; and
the ratio of Izz to the volume of the golf club head is at least 1.048 kg/m; and
the ratio of Ixx to the volume of the golf club head is at least 0.677 kg/m.
7. The golf club head according to claim 3 , wherein:
the moment of inertia about the hosel axis is between 711 kg-mm 2 and 896 kg-mm 2 ; and
Ixx is between 293 kg-mm 2 and 403 kg-mm 2 , Iyy is at least 275 kg-mm 2 , and Iyy is less than Ixx.
8. The golf club head according to claim 2 , wherein a difference between Zup of the golf club head, defined as a distance between a center of gravity of the golf club head and a ground plane in the z-axis direction when the golf club head is in a normal address position on the ground plane, and half of a maximum head height of the golf club head is less than about −4.0 mm.
9. The golf club head according to claim 8 , wherein:
a forgiveness ratio of the golf club head is at least 0.915;
the forgiveness ratio is equal to (hosel axis to back dimension)*(face area)/(volume);
the hosel axis to back dimension is a total distance, along the y-axis, between a rearward-most portion of the golf club head and the hosel axis;
the face area is a total surface area of the striking surface; and
the volume is the volume of the golf club head.
10. The golf club head according to claim 9 , wherein the forgiveness ratio is at least 0.920.
11. The golf club head according to claim 10 , wherein the forgiveness ratio is at least 0.930.
12. The golf club head according to claim 11 , wherein the forgiveness ratio is at least 0.945.
13. The golf club head according to claim 12 , wherein a total surface area of the striking surface is no more than 4,600 mm 2 .
14. The golf club head according to claim 9 , further comprising an adjustable head-shaft connection assembly coupled to the hosel and configured to adjust an orientation of the golf club head relative to a golf club shaft; and further wherein a rear portion of the golf club head is configured to retain a weight.
15. The golf club head according to claim 14 , wherein a ratio of the moment of inertia about the hosel axis to Izz is at least 1.561.
16. The golf club head according to claim 15 , wherein the ratio of Ixx to the volume of the golf club head is no more than 0.773 kg/m.
17. The golf club head according to claim 16 , wherein:
the maximum head height of the golf club head corresponds with a highest point on the crown of the golf club head; and
the highest point on the crown of the golf club head is located rearward of the hosel and the highest point on the crown of the golf club head is defined by a portion of the crown made of the first fiber-reinforced polymeric material.
18. The golf club head according to claim 17 , further comprising:
a port formed in the sole of the golf club head, wherein the adjustable-head shaft connection assembly comprises a fastener extending through the port; and
a channel formed in the sole of the golf club head and extending lengthwise in a direction substantially parallel to the x-axis, wherein a heel end of the channel is proximate the port.
19. The golf club head according to claim 9 , further comprising an adjustable head-shaft connection assembly coupled to the hosel and configured to adjust an orientation of the golf club head relative to a golf club shaft; and further wherein a rear portion of the golf club head comprises a weight port configured to retain a weight, and the weight port is located proximate the rear end of the golf club head.
20. The golf club head according to claim 1 , wherein:
the sole is at least partially defined by an elevated structure protruding from adjoining surfaces of the sole and extending lengthwise in a front-to-rear direction along the lower side of the golf club head;
the elevated structure adjoins the adjoining surfaces of the sole along first straight edges of the sole;
the elevated structure comprises planar sidewalls each contiguous with a corresponding one of the first straight edges;
the elevated structure further comprises an elevated surface adjoining the planar sidewalls along second straight edges of the sole;
the elevated structure additionally comprises a rearward-facing surface having a polygon-shaped outer perimeter; and
the polygon-shaped outer perimeter of the elevated structure is contiguous with the planar sidewalls and the elevated surface.
21. The golf club head according to claim 1 , wherein at least a portion of the face comprises a composite material.