Weighted iron set
The present invention is direct to a set of golf clubs comprising long irons, mid-irons and short irons. The invention contemplates the use of titanium or steel for the main body portion and a tungsten weight member coupled to the toe and a tungsten heel weight member coupled in a hosel cavity.
1. A set of golf clubs comprising at least a first club head having a loft between about 15 and 25 degrees, a first club head mass, a y-axis extending vertically through a face center of the first club head and a first Moment of Inertia about the y-axis, a second club head having a loft of between about 26 and 35 degrees, a second club head mass, a second y-axis extending vertically through a face center of the second club head and a second Moment of Inertia about the second y-axis, and a third club head having a loft of about 36 degrees or greater, a third club head mass, a third y-axis extending vertically through a face center of the third club head and a third Moment of Inertia about the third y-axis,
the first club head comprising: a first body made of steel comprising a first heel, a first toe, a first topline, a first sole, a first hosel, and a first back wall, a first face insert made of steel and having a first face insert mass, the first face insert having a thickness of 1.8 mm or less and has an Ultimate Tensile Strength of 2000 MPa or greater, the first face insert being welded to the first body to form a first hollow cavity between the first face insert and the first back wall;
a first toe weight member formed of tungsten and coupled in a lower toe portion of the first hollow cavity that has a first toe weight member mass that comprises greater than 25% of the first club head mass; and
a first heel weight member formed of tungsten and coupled in a first hosel cavity of the first body such that a shaft axis intersects the first heel weight member below the first hosel;
wherein the first face insert mass is less than first toe weight member mass, and
wherein the first sole has a first sole width and the first face insert includes a first face insert sole portion that extends from a leading edge of the first face insert toward the first back wall a distance in front-to-back direction that is at least 25% of the first sole width.
2. The set of golf clubs of claim 1 , wherein the second club head comprises:
a second body made of steel comprising a second heel, a second toe, a second topline, a second sole, a second hosel, and a second back wall,
a second face insert made of steel and having a second face insert mass, the second face insert having a thickness of 1.8 mm or less and has an Ultimate Tensile Strength of 2000 MPa or greater, the second face insert being welded to the body to form a second hollow cavity between the second face insert and the second back wall;
a second toe weight member formed of tungsten and coupled in a lower toe portion of the second hollow cavity that has a second toe weight member mass that comprises greater than 25% of the second club head mass; and
a second heel weight member formed of tungsten and coupled in a second hosel cavity of the second body such that a second shaft axis intersects the second heel weight member below the second hosel;
wherein the second face insert mass is less than second toe weight member mass.
3. The set of golf clubs of claim 2 , wherein the first face insert and the second face insert have Ultimate Tensile Strengths of greater than 2300 MPa.
4. The set of golf clubs of claim 2 , wherein the first heel weight member comprises between 5% and 10% of the first club head mass and the second heel weight member comprises between 8% and 15% of the second club head mass.
5. The set of golf clubs of claim 4 , wherein the first Moment of Inertia about the y-axis, the second Moment of Inertia about the second y-axis and the third Moment of Inertia about the third y-axis are greater than 230 kg-mm 2 .
6. The set of golf clubs of claim 5 , wherein the first Moment of Inertia about the y-axis, the second Moment of Inertia about the second y-axis and the third Moment of Inertia about the third y-axis for all of the irons are greater than about 260 kg-mm 2 .
7. The set of golf clubs of claim 5 , wherein the first Moment of Inertia about the y-axis is less than both the second Moment of Inertia about the second y-axis and the third Moment of Inertia about the third y-axis.
8. The set of golf clubs of claim 2 , wherein the first club has a first Moment of Inertia about the shaft axis that is between 650 kg-mm 2 and 700 kg-mm 2 , the second club has a second Moment of Inertia about the shaft axis that is between 650 kg-mm 2 and 700 kg-mm 2 and the third club has a third Moment of Inertia about the shaft axis that is between 650 kg-mm 2 and 700 kg-mm 2 .
9. The set of golf clubs of claim 8 , wherein the first Moment of Inertia about the shaft axis is within 10% of the second Moment of Inertia about the shaft axis and the second Moment of Inertia about the shaft axis is within 10% of the third Moment of Inertia about the shaft axis.
10. The set of golf clubs of claim 1 , wherein the first face insert has a perimeter region surrounding a center that is thicker than the perimeter region and a smooth transition zone connects the center to the perimeter.
11. The set of golf clubs of claim 1 , wherein the first club head further comprises a medallion that covers an aperture in the first back wall.