Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Wataru Kimizuka

Takashi Nakamura

Masahiko Ueda

Masahide Onuki

Yasushi Sugimoto

Seiji Hayase

Naoyoshi Ueda

Naruhiro Mizutani

Daisuke Kohno

Kenji Takasu

Hiroshi Hasegawa

A golf club includes a head; a shaft having a tip end and a butt end; and a grip. The golf club has a length of greater than or equal to 45.0 inches. The head has a weight of greater than or equal to 195 g. The golf club has a club moment about a rotation center of less than or equal to 22.74 (kg&#xb7;cm), the rotation center being a point 100 mm away from a butt end of the grip. The shaft may have a weight of less than or equal to 40 g. The golf club has a weight of greater than or equal to 280 g. A butt end region having a distance from the butt end of the grip of 100 mm or less may have a weight of greater than or equal to 27 g. This golf club can exhibit an on-plane effect.

Golf club

A golf club includes a head; a shaft; and a grip. The head has a weight Wh of greater than or equal to 195 g. The golf club has a club length Lc of greater than or equal to 45.0 inches. The golf club has a club weight Wc of greater than or equal to 295 g. The golf club has a swing moment of inertia Isw of less than or equal to 5470&#xd7;10(g&#xb7;cm). The swing moment of inertia Isw (g&#xb7;cm) is calculated by the following formula (1):&#xd7;(+40)&#x2003;&#x2003;(1),where Wc represents the club weight (g), Lg represents a distance (cm) in an axial direction between a butt end of the grip and a center of gravity of the golf club, and Ic represents a moment of inertia (g&#xb7;cm) of the golf club about the center of gravity of the golf club.

A golf club includes a head; a shaft; a grip; and a weight member that is located in a butt end region. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The golf club has a length of greater than or equal to 45.0 inches. The golf club has a weight of less than 295 g. The head has a weight of greater than or equal to 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. W/Wis greater than or equal to 0.40, where Wrepresents a weight (g) of the butt end region, and Wrepresents a weight (g) of the shaft-grip-weight portion.

A golf club includes a head; a shaft; a grip; and a weight member that is located in a butt end region. The grip and the weight member constitute a grip-weight portion. The shaft, the grip, and the weight member constitute a shaft-grip-weight portion. The head has a weight of greater than or equal to 195 g. The grip-weight portion has a weight of greater than or equal to 40 g. The shaft has a weight of less than or equal to 40 g. The golf club has a weight of greater than or equal to 275 g and less than or equal to 300 g. W/Wis greater than or equal to 0.40, where Wrepresents a weight (g) of the butt end region, and Wrepresents a weight (g) of the shaft-grip-weight portion.

A golf clubincludes a head, a shaft, and a grip. A club inertia moment about a swing axis is defined as Isw. A club inertia moment about a grip end is defined as Ige. Ige is 2760 (kg&#xb7;cm) or greater and less than 2820 (kg&#xb7;cm). Isw/Ige is equal to or less than 2.42. A club weight is defined as Wc (kg), an axial direction distance from the grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg&#xb7;cm). Isw is calculated by Equation (1) below. Ige is calculated by Equation (2) below.&#xd7;(+60)&#x2003;&#x2003;(1)&#xd7;()&#x2003;&#x2003;(2)

This fitting method includes, for example, the following steps A1 to E1:

Fitting method of golf club

Provided is a method of evaluating stability of a golf swing. The method comprises calculating a force indicator that represents a force that acts on a body of a golfer during the golf swing and evaluating stability of the golf swing according to a magnitude of the force indicator. In the calculating, the force indicator may be calculated during the golf swing made with a specific golf club, and in the evaluating, the stability of the golf swing may be evaluated as a characteristic of the specific golf club, in accordance with the magnitude of the force indicator.

Method of evaluating stability of golf swing

A hollow golf club head has: a moment of inertia Ix around a vertical axis of 4500 to 5900 g sq&#xb7;cm; and a moment of inertia Iy around an inclined axis of 5300 to 6800 g sq&#xb7;cm, which satisfy Iy=&#x3c;1.071 I&#xd7;Ix+482 g sq&#xb7;cm. The vertical axis passes through the center of gravity of the head under a standard state in which the head is set on a horizontal plane so that a shaft center line is inclined at a lie angle of 60 degrees with respect to the horizontal plane within a vertical plane and a club face lies at the loft angle. The inclined axis passes through the center of gravity of the head and is inclined downwardly toward the toe from the heel at 62 degrees with respect to the horizontal plane within a plane parallel with the above-mentioned vertical plane.

Golf club head and method for predicting carry distance performance thereof

A golf clubincludes a head, a shaft, and a grip. A club inertia moment about a swing axis is defined as Isw. A club inertia moment about a grip end is defined as Ige. Ige is 2920 (kg&#xb7;cm) or greater and less than 2970 (kg&#xb7;cm). Isw/Ige is equal to or less than 2.48. A club weight is defined as Wc (kg), an axial direction distance from the grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg&#xb7;cm). Isw is calculated by Equation (1) below. Ige is calculated by Equation (2) below.&#xd7;(+60)&#x2003;&#x2003;(1)&#xd7;()&#x2003;&#x2003;(2)

A golf clubincludes a head, a shaft, and a grip. A club inertia moment about a swing axis is defined as Isw. A club inertia moment about a grip end is defined as Ige. Ige is 2870 (kg&#xb7;cm) or greater and less than 2920 (kg&#xb7;cm). Isw/Ige is equal to or less than 2.46. A club weight is defined as Wc (kg), an axial direction distance from the grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg&#xb7;cm). Isw is calculated by Equation (1) below. Ige is calculated by Equation (2) below.sw=&#xd7;(+60)&#x2003;&#x2003;(1)ge=&#xd7;()&#x2003;&#x2003;(2)

A golf clubincludes a head, a shaft, and a grip. A club inertia moment about a swing axis is defined as Isw. A club inertia moment about a grip end is defined as Ige. Ige is 2820 (kg&#xb7;cm) or greater and less than 2870 (kg&#xb7;cm). Isw/Ige is equal to or less than 2.42. A club weight is defined as Wc (kg), an axial direction distance from the grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg&#xb7;cm). Isw is calculated by Equation (1) below. Ige is calculated by Equation (2) below.&#xd7;(+60)&#x2003;&#x2003;(1)&#xd7;()&#x2003;&#x2003;(2)

A head measuring method of the present invention includes: Preferably, three or more combinations of the markers set such that the marker interval is equal to or greater than a head vertical width exist.

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Kobe, Japan

Wataru Kimizuka