High volume aerodynamic golf club head having a post apex attachment promoting region

A high volume aerodynamic golf club head having a post apex attachment promoting region (100) comprising:

• A) a hollow body (110) having a club head volume of at least 400 cc, a face (200), a sole section (300), a crown section (400), a front (112), a back (114), a heel (116), and a toe (118), wherein
• i) the hollow body (110) has a bore having a center that defines a shaft axis (SA) which intersects with a horizontal ground plane (GP) to define an origin point;
• and
• ii) the hollow body (110) has a center of gravity (CG) located:
• (a) vertically toward the crown section (400) from the origin point a distance Ycg in a direction orthogonal to the ground plane (GP);
• (b) horizontally from the origin point toward the toe (118) a distance Xcg that is parallel to a vertical plane defined by the shaft axis (SA) and parallel to the ground plane (GP);
• and
• (c) a distance Zcg from the origin toward the back (114) in a direction orthogonal to the vertical direction used to measure Ycg and orthogonal to the horizontal direction used to measure Xcg;
• B) the face (200) having a top edge (210) and a lower edge (220), wherein a top edge height (TEH) is the elevation of the top edge (210) above the ground plane (GP), and a lower edge height (LEH) is the elevation of the lower edge (220) above the ground plane (GP), wherein a maximum top edge height (TEH) is at least 2 inches;
• and
• C) the crown section (400) having a crown apex (410) located an apex height (AH) above the ground plane (GP), wherein;
• i) the crown apex (410) is located behind the forwardmost point on the face (200) a distance that is a crown apex setback dimension (412) measured in a direction toward the back (114) and orthogonal to the vertical direction used to measure Ycg and orthogonal to the horizontal direction used to measure Xcg;
• ii) the crown apex (410) is located a distance from the origin toward the toe (118) a crown apex x-dimension (416) distance that is parallel to the vertical plane defined by the shaft axis (SA) and parallel to the ground plane (GP);
• and
• iii) the crown section (400) includes a post apex attachment promoting region (420) on the surface of the crown section (400) at an elevation above a maximum top edge plane (MTEP) wherein the post apex attachment promoting region (420) begins at the crown apex (410) and extends toward the back (114), and the post apex attachment promoting region (420) includes:
• (a) an attachment promoting region length (422) measured along the surface of the crown section (400) and orthogonal to the vertical plane defined by the shaft axis (SA), and the attachment promoting region length (422) is at least as great as fifty percent of the crown apex setback dimension (412);
• (b) an attachment promoting region width (424) measured along the surface of the crown section (400) in a direction parallel to the vertical plane defined by the shaft axis (SA), and the attachment promoting region width (424) is at least as great as the difference between the crown apex x-dimension (416) and the distance Xcg;
• (c) a portion of the post apex attachment promoting region (420) has a heel-to-toe radius of curvature (Rh-t) that is less than 4 inches;
• (d) wherein within a vertical section through the crown apex (410) and perpendicular to the vertical plane created by the shaft axis (SA), a portion of the post apex attachment promoting region (420) has an apex-to-rear radius of curvature (Ra-r) that is greater than 5 inches;
• and
• (e) wherein within the vertical section through the crown apex (410) and perpendicular to the vertical plane created by the shaft axis (SA) the entire contour of the post apex attachment promoting region (420) above the maximum top edge plane (MTEP) and within the vertical section is within a twenty degree angle downward from horizontal originating at the crown apex (410).