Progressive iron set
View Patent ↗The present invention is directed to a set of golf clubs comprising long irons, mid-irons and short irons. The irons have a progressive horizontal CG location. Preferably, the long and MID irons have a CG located between about 1 mm and 3 mm towards the hosel and the short iron CG is located between about 3 mm and 4 mm toward the hosel. Further the irons can have a substantially constant blade width with progressively increasing toe height and progressively decreasing scoreline width.
1. A set of golf clubs comprising at least a first golf club, a second golf club, and a third golf club, wherein:
the first, second and third golf clubs each comprising a heel, a toe, an upper surface, a lower surface, a hosel and a front face having a face center, and
the first golf club further comprising a first loft angle (LA 1 ) of between 15 and 25 degrees and a first center of gravity positioned horizontally from the face center towards the hosel by a first distance,
the second golf club comprising a second loft angle (LA 2 ) of between 26 and 36 degrees and a second center of gravity positioned horizontally from the face center towards the hosel by a second distance, and
the third golf club comprising a third loft angle (LA 3 ) of between 37 and 47 degrees and a third center of gravity positioned horizontally from the face center towards the hosel by a third distance,
wherein the first distance and the second distance are approximately constant and the third distance is at least 30 percent greater than the first distance, and
wherein the third distance is greater than the values defined by the line CG-Xfc=0.02(LA)+2, where CG-Xfc is the distance of the center of gravity from the face center toward the hosel in the horizontal direction and LA is loft angle.
2. The set of golf clubs of claim 1 , wherein the third distance is between 35 percent and 70 percent greater than the first distance.
3. The set of golf clubs of claim 1 , wherein the first and second distance are between about 1 mm and 3 mm.
4. The set of golf clubs of claim 3 , wherein the third distance is between about 3 mm and 4 mm.
5. The set of golf clubs of claim 1 , wherein, for the third golf club, the third distance is greater than about 15 percent of a center of gravity position measured vertically from the ground.
6. The set of golf clubs of claim 1 , wherein the set is comprised of at least 2 golf clubs comprising a loft angle (LA) of between 15 and 25 degrees, at least 2 golf clubs comprising a loft angle (LA) of between 26 and 36 degrees and at least 2 golf clubs comprising a loft angle (LA) of between 37 and 47 degrees,
wherein each of the 2 golf clubs having a loft angle (LA) of between 15 and 25 degrees has a center of gravity positioned horizontally from the face center a distance of between about 0 mm and 2.5 mm;
wherein each of the 2 golf clubs having a loft angle (LA) of between 26 and 36 degrees has a center of gravity positioned horizontally from the face center a distance of between about 0 mm and 2.5 mm; and
wherein each of the 2 golf clubs having a loft angle (LA) of between 37 and 47 degrees has a center of gravity positioned horizontally from the face center toward the heel a distance of between about 3 mm and 4 mm.
7. The set of golf clubs of claim 6 , wherein each of the 2 golf clubs having a loft angle (LA) of between 15 and 25 degrees is further comprised of a heel weight and a toe weight formed from a material having a specific gravity of greater than about 15 g/cc.
8. The set of golf clubs of claim 7 , wherein each of the 2 golf clubs having a loft angle (LA) of between 26 and 36 degrees is further comprised of a heel weight and a toe weight and at least one of the heel and toe weights is formed from a material having a specific gravity of greater than about 15 g/cc.
9. The set of golf clubs of claim 8 , wherein at least one of the 2 golf clubs having a loft angle (LA) of between 37 and 47 degrees is further comprised of a hosel weight formed from a material having a specific gravity of greater than about 15 g/cc.
10. A set of golf clubs comprising at least a first golf club, a second golf club, and a third golf club, wherein
the first, second and third golf clubs each comprising a heel, a toe, an upper surface, a lower surface, a hosel and a front face having a face center, and
the first golf club further comprising a first loft angle (LA 1 ) of between 15 and 25 degrees and a first center of gravity position horizontally from the face center toward the hosel by a first distance,
the second golf club comprising a second loft angle (LA 2 ) of between 26 and 36 degrees and a second center of gravity position horizontally from the face center toward the hosel by a second distance, and
the third golf club comprising a third loft angle (LA 3 ) of between 37 and 47 degrees and a third center of gravity position horizontally from the face center toward the hosel by a third distance,
wherein the first distance and the second distance are approximately constant and the third distance is at least 30 percent greater than the first distance, and
wherein the third golf club has a moment of inertia about a shaft axis that falls below the line defined by the linear equation MOI-SA=4.6(LA)+400, wherein MOI-Sa is the moment of inertia about the shaft axis and LA is the loft angle.
11. The set of golf clubs of claim 10 further comprising a fourth golf club having a fourth loft angle of between 45 and 52 degrees and having a moment of inertia about the shaft axis of between 575 kg*mm 2 and 600 kg*mm 2 .
12. The set of golf clubs of claim 10 wherein the third golf club has a center of gravity height and the third distance is greater than about 15 percent of the center of gravity height.