Patent ID: 8167737

Claim:
A hollow wood-type golf club head having a face for hitting a golf ball, wherein: the moment of inertia Ix about a vertical axis passing through the club head's center of gravity is 4,000 to 5,900 g·cm 2 in the standard state that the club head is placed on a horizontal plane in the state that an axial center line of a shaft is disposed in an optional vertical plane and is inclined at a prescribed lie angle with respect to the horizontal plane and said face is inclined at a prescribed loft angle, the moment of inertia Iy about a horizontal axis extending through the club head's center of gravity is 3,000 to 5,900 g·cm 2 , said face has a face bulge and a face roll, the radius of curvature Rx of the face bulge is from 18 to 25 inches, the Ry/Rx ratio of the radius of curvature Ry of the face roll to said radius of curvature Rx of the face bulge is 0.50 to 0.90, and the Ry/Iy ratio of the face roll radius Ry to the moment of inertia Iy about the horizontal axis extending through the club head's center of gravity in the toe-heel direction is from 0.0040 to 0.0080 inch/g·cm 2 .