A golf club includes a club head having a volume of greater than about 360 cm.sup.3 and a mass less than 200 g. A shaft attachable to the club head has a tip end, a butt end, and a shaft balance point distance, BP.sub.s, as measured from the butt end, of no more than 19 inches. And the golf club has a mass less than 300 g.

A golf club includes a club head having a volume of greater than about 360 cm.sup.3 and a mass less than 200 g. A shaft attachable to the club head has a tip end, a butt end, and a shaft balance point distance, BP.sub.s, as measured from the butt end, of no more than 19 inches. And the golf club has a mass less than 300 g.

A system for fitting golf clubs to golfers that enables an overall club length to be varied without varying a length of a shaft. The system enables a greater number of combinations of club characteristics, such as shaft flex, brand, and length, to be contained within a club fitting cart and/or for a same number of combinations of club characteristics to be contained within a smaller cart.

A system for fitting golf clubs to golfers that enables an overall club length to be varied without varying a length of a shaft. The system enables a greater number of combinations of club characteristics, such as shaft flex, brand, and length, to be contained within a club fitting cart and/or for a same number of combinations of club characteristics to be contained within a smaller cart.

Disclosed are systems and methods of adjusting the playing orientation of the head of a golf club. An adjustment to the axis of the shaft in reference to the vertical plane is constrained within minimum and maximum limits, so as to conform to current and proposed changes to the United States Golf Association (USGA) rules of play. The fine adjustment within these constraints cannot be readily made, and all adjustable parts are firmly fixed, so there is no reasonable likelihood of them working loose during a round. The adjustments to the club are designed such that during a stipulated round, the playing characteristics of a club cannot be purposely changed by adjustment or by other means.

Disclosed are systems and methods of adjusting the playing orientation of the head of a golf club. An adjustment to the axis of the shaft in reference to the vertical plane is constrained within minimum and maximum limits, so as to conform to current and proposed changes to the United States Golf Association (USGA) rules of play. The fine adjustment within these constraints cannot be readily made, and all adjustable parts are firmly fixed, so there is no reasonable likelihood of them working loose during a round. The adjustments to the club are designed such that during a stipulated round, the playing characteristics of a club cannot be purposely changed by adjustment or by other means.

A method of customizing a golf club, wherein the method includes generating operating data representative of a user operating a mechanical device. The operating data is generated by a first sensor sized and configured to be removably positioned in a mounting port formed on the mechanical device during operation of the mechanical device. The sensor is interchangeably positionable in the mounting port with at least one mass insert, the at least one mass insert being adapted to be interchangeably positioned in the mounting to provide at least two different mass configurations. The method further includes determining a recommended configuration of the at least one mass insert specific to the user based on the operating data generated by the sensor, and transmitting information representative of the recommended mass insert.

A method of customizing a golf club, wherein the method includes generating operating data representative of a user operating a mechanical device. The operating data is generated by a first sensor sized and configured to be removably positioned in a mounting port formed on the mechanical device during operation of the mechanical device. The sensor is interchangeably positionable in the mounting port with at least one mass insert, the at least one mass insert being adapted to be interchangeably positioned in the mounting to provide at least two different mass configurations. The method further includes determining a recommended configuration of the at least one mass insert specific to the user based on the operating data generated by the sensor, and transmitting information representative of the recommended mass insert.

Method for coupling a sensor to a piece of equipment, such as a golf club, baseball bat, or tennis racket, that ensures that the sensor is in a known position and orientation relative to the equipment. Compensates and calibrates for degrees of freedom introduced in manufacturing and installation. The method may include manufacturing a sensor receiver that aligns with equipment in a fixed orientation, and that holds a sensor housing in a fixed orientation relative to the receiver. Remaining uncertainties in sensor position and orientation may be addressed using post-installation calibration. Calibration may include performing specific calibration movements with the equipment and analyzing the sensor data collected during these calibration movements.

A shaft for a golf club includes a first end, a second end, and a demarcation. The first end is adapted to attach to a club head. The second end is adapted to receive a grip distal to the first end. The demarcation is positioned at or adjacent to the balance point of the golf club between the first end and the second end.