Golf club

Abstract

A golf club head includes a golf club body including a crown, a sole, and a skirt connected between the crown and the sole, the golf club body including a front including a leading edge and a back including a trailing edge, and a hosel connected to the golf club body; a face connected to the front of the golf club body, the face including a geometric center, the golf club head including reduced spin on various shots.

That which is claimed is: 
     
         1 . A golf club head comprising:
 a golf club body including a crown, a sole, and a skirt connected between the crown and the sole, the golf club body including a front including a leading edge and a back including a trailing edge;   a face connected to the front of the golf club body, the face including a geometric center defining an origin of a coordinate system, the coordinate system including
 an x-axis tangential to the face and generally parallel to a ground plane; 
 a y-axis orthogonal to the x-axis and generally parallel to the ground plane; and 
 a z-axis orthogonal to both the x-axis and the y-axis and orthogonal to the ground plane; 
   a boundary condition feature (BCF) located in the sole of the golf club head proximate the leading edge, the BCF being a softening BCF and including an aperture from an exterior of the golf club head to an interior of the golf club head, the BCF including a plugging material to cover the aperture, the BCF extending substantially from the sole into the skirt of the golf club head, the BCF having a length measured parallel to the x-axis of between about 75 mm and about 95 mm; and,   the sole of the golf club head including a first sole portion located between the leading edge and the BCF, the first sole portion including a lip feature defining a forewardmost edge of the BCF, the lip feature being of a thickness greater than the first sole portion.   
     
     
         2 . The golf club head of  claim 1 , wherein the BCF includes a central point of the forewardmost edge, a first central end point of the forewardmost edge, and a second central end point of the forewardmost edge, the first and second central end points defining the end of a central portion of the BCF, wherein the central point is further from the leading edge as measured parallel to the y-axis than the first and second central end points. 
     
     
         3 . The golf club head of  claim 1 , wherein the BCF includes a central portion, a toeward return portion, and a heelward return portion, wherein each of the toeward return portion and the heelward return portion is defined entirely within the skirt. 
     
     
         4 . The golf club head of  claim 1 , wherein the BCF is defined by the forwardmost edge and a rearwardmost edge, wherein a distance between the forwardmost edge and the rearwardmost edge proximate center face is between about 4 mm and about 7 mm as measured in a direction parallel to the y-axis. 
     
     
         5 . The golf club head of  claim 4 , wherein the BCF includes a central portion, and wherein the distance between the forwardmost edge and the rearwardmost edge is consistent along the entirety of the central portion. 
     
     
         6 . The golf club head of  claim 1 , further comprising a stiffening BCF being on of defined in and connected to the crown proximate the face. 
     
     
         7 . The golf club head of  claim 1 , wherein the length of the BCF measured parallel to the x-axis of between about 80 mm and about 85 mm. 
     
     
         8 . The golf club head of  claim 1 , wherein the golf club head includes a static loft of greater than 14°. 
     
     
         9 . The golf club head of  claim 1 , wherein the golf club head is of a volume of greater than 425 cc. 
     
     
         10 . A golf club comprising:
 a golf club body including a crown, a sole, and a skirt connected between the crown and the sole, the golf club body including a front including a leading edge and a back including a trailing edge, and a hosel connected to the golf club body;   a face connected to the front of the golf club body, the face including a geometric center defining an origin of a coordinate system, the coordinate system including
 an x-axis tangential to the face and generally parallel to a ground plane; 
 a y-axis orthogonal to the x-axis and generally parallel to the ground plane; and 
 a z-axis orthogonal to both the x-axis and the y-axis and orthogonal to the ground plane 
 the face also including at least one score line; 
   at least one BCF being one of connected to and defined in the golf club head proximate the face;   a shaft having a first end and a second end, the first end connected to the hosel;   a grip connected to the second end of the shaft,   wherein as a result of a robot test of the golf club using a urethane cover golf ball having at least three pieces, a spin rate of the golf ball is not greater than 3,300 rpm, the robot testing is performed at a golf club head speed of 107±1 mph club head speed, 11±1° dynamic loft, 0±1° scoreline lie angle relative to ground, 2±1° open face angle relative to target line, 2±1° inside-to-outside head path, and 0.5±1° downward path, the golf club head impacting the golf ball at centerface.   
     
     
         11 . The golf club head of  claim 10 , wherein the first end of the shaft is connected to a shaft sleeve and wherein the shaft sleeve is fastened to the hosel. 
     
     
         12 . The golf club head of  claim 11 , wherein the sleeve is fastenable to the hosel in a variety of positions, wherein at least one of the variety of positions is of distinct loft from at least one other of the variety of positions. 
     
     
         13 . The golf club head of  claim 10 , wherein the golf club head includes a static loft of greater than 14°. 
     
     
         14 . The golf club head of  claim 10 , wherein the golf club head is of a static loft of at most 14°. 
     
     
         15 . The golf club head of  claim 10 , wherein the golf club head is of a volume of greater than 425 cc. 
     
     
         16 . A golf club comprising:
 a golf club body including a crown, a sole, and a skirt connected between the crown and the sole, the golf club body including a front including a leading edge and a back including a trailing edge, and a hosel connected to the golf club body;   a face connected to the front of the golf club body, the face including a geometric center defining an origin of a coordinate system, the coordinate system including
 an x-axis tangential to the face and generally parallel to a ground plane; 
 a y-axis orthogonal to the x-axis and generally parallel to the ground plane; and 
 a z-axis orthogonal to both the x-axis and the y-axis and orthogonal to the ground plane 
 the face also including at least one score line; 
   a shaft having a first end and a second end, the first end connected to the hosel;   a grip connected to the second end of the shaft,   wherein as a result of a robot test of the golf club using a urethane cover golf ball having at least three pieces, a spin rate of the golf ball is not greater than 3,300 rpm, the robot testing is performed at a golf club head speed of 107±1 mph club head speed, 11±1° dynamic loft, 0±1° scoreline lie angle relative to ground, 2±1° open face angle relative to target line, 2±1° inside-to-outside head path, and 0.5±1° downward path, the golf club head impacting the golf ball at centerface.   
     
     
         17 . The golf club head of  claim 16 , wherein the spin rate is not greater than 3,000 rpm. 
     
     
         18 . The golf club head of  claim 16 , wherein the spin rate is not greater than 2,800 rpm. 
     
     
         19 . The golf club head of  claim 16 , wherein the spin rate is not greater than 2,600 rpm. 
     
     
         20 . The golf club head of  claim 16 , wherein the spin rate is not greater than 2,400 rpm. 
     
     
         21 . The golf club head of  claim 16 , wherein the spin rate is not greater than 2,200 rpm.