Abstract: A method of measuring, recording, and mapping at least one performance variable of a face of a golf club head.

Abstract: A golf club having a long blade length, large transfer distance, and low forwardly located center of gravity, and all the benefits afforded therefrom.

Abstract: A golf club head having a face with a face center and a center face measured performance variable, which may be a characteristic time, or CT, value, a coefficient of restitution, or COR, value, or a potential smash factor. The face includes a center face permanent indicia that is indicative of the center face measured performance variable. Relationships among the permanent indicia and the face are disclosed to reduce the likelihood of distraction caused by the permanent indicia as a golfer addresses a shot. Further, the surface roughness of the permanent indicia is controlled with respect to the surface roughness of the face to reduce the impact that the permanent indicia has on the performance of the golf club head.

Abstract: A golf club having a long blade length, large transfer distance, and low forwardly located center of gravity, and all the benefits afforded therefrom.

Abstract: A golf club having a forwardly located center of gravity and all the benefits afforded therefrom.

Abstract: A hollow golf club incorporating a stress reducing feature including at least a toe located stress reducing feature or a heel located stress reducing feature at least partially located on the skirt of the golf club head. The location and size of the stress reducing feature and their relationship to one another play a significant role in selectively increasing deflection of the face.

Abstract: A fairway wood golf club characterized by a long blade length, a small club moment arm, and a large transfer distance thereby producing a relatively small CG angle and a relatively high face closing moment of inertia, and all the benefits afforded therefrom.

Abstract: A golf club incorporating a stress reducing feature and a shaft connection system socket. The location and size of the stress reducing feature and the shaft connection system socket, and their relationship to one another, selectively increase deflection of the face and provide stability of the shaft connection system.

Abstract: A golf club incorporating a stress reducing feature in contact with a shaft connection system socket. The location and size of the stress reducing feature and the shaft connection system socket, and their relationship to one another, selectively increase deflection of the face and maintain stability of the shaft connection system.

Abstract: A golf club head having a face with a face center and a center face measured performance variable, which may be a characteristic time, or CT, value, a coefficient of restitution, or COR, value, or a potential smash factor. The face includes a center face permanent indicia that is indicative of the center face measured performance variable. Relationships among the permanent indicia and the face are disclosed to reduce the likelihood of distraction caused by the permanent indicia as a golfer addresses a shot. Further, the surface roughness of the permanent indicia is controlled with respect to the surface roughness of the face to reduce the impact that the permanent indicia has on the performance of the golf club head.

Abstract: A hollow golf club incorporating a stress reducing feature including at least a toe located stress reducing feature or a heel located stress reducing feature at least partially located on the skirt of the golf club head. The location and size of the stress reducing feature and their relationship to one another play a significant role in selectively increasing deflection of the face.

Abstract: An iron-type golf club head having a sole channel extending from an exterior of a sole portion toward a face. The sole channel has an axis that intersects the face at an axis-to-face intersection point for at least one position along a channel length, and preferably at least 25% of the channel length. The elevation of the intersection point may below the Ycg distance and the axis defines an angle from the vertical that may be related to the loft. The iron-type golf club head may be incorporated in a set containing club heads with varying degrees of unsupported face area.

Abstract: A hollow golf club incorporating a stress reducing feature including at least a toe located stress reducing feature or a heel located stress reducing feature at least partially located on the skirt of the golf club head. The location and size of the stress reducing feature and their relationship to one another play a significant role in selectively increasing deflection of the face.

Abstract: A fairway wood golf club characterized by a long blade length, a small club moment arm, and a large transfer distance thereby producing a relatively small CG angle and a relatively high face closing moment of inertia, and all the benefits afforded therefrom.

Abstract: A fairway wood golf club characterized by a long blade length with a long heel blade length section, while maintaining a small club moment arm, as well as a high ratio of the heel blade length section to the club head front-to-back dimension, a low ratio of the club moment arm to the heel blade length section, or a low center of gravity height, and all the benefits afforded therefrom.

Abstract: A fairway wood golf club characterized by a long blade length with a long heel blade length section, while maintaining a small club moment arm, as well as a high ratio of the heel blade length section to the club head front-to-back dimension, a low ratio of the club moment arm to the heel blade length section, or a low center of gravity height, and all the benefits afforded therefrom.

Abstract: The present invention is a unique golf club head characterized by a long blade length with a long heel blade length section, while having a small club moment arm and a low center of gravity, and all the benefits afforded therefrom.

Abstract: A hollow golf club incorporating a stress reducing feature including at least a toe located stress reducing feature or a heel located stress reducing feature at least partially located on the skirt of the golf club head. The location and size of the stress reducing feature and their relationship to one another play a significant role in selectively increasing deflection of the face.

Abstract: The present invention is a unique golf club head characterized by a long blade length with a long heel blade length section, while having a small club moment arm and a low center of gravity, and all the benefits afforded therefrom.

Abstract: The present invention is a unique fairway wood type golf club. The club is a fairway wood type golf club characterized by a long blade length with a long heel blade length section, while having a small club moment arm and a low center of gravity relative to a face height of the club, and all the benefits afforded therefrom. The fairway wood incorporates the discovery of unique relationships among key club head engineering variables that are inconsistent with merely striving to obtain a high MOIy using conventional golf club head design wisdom. The resulting fairway wood has a face closing moment of inertia (MOIfc) that provides golfers with a feel similar to that of a modern driver or hybrid golf club.