Patent ID: 7846042

Claim:
A right-handed golf club comprising: a shaft; a golf club head comprising: a hosel accepting a part of the shaft; a portion of the shaft comprising the part of the shaft in the hosel and two inches of shaft extending out from the hosel; a center of gravity; and a face having a hit center that is at an expected location for the ball to contact the face as indicated by markings on the face, the hit center defining an origin of an impact reference frame having X, Y and Z axes defined based on swinging the golf club about a swing axis along a swing plane that is angled to a surface, wherein the Y axis is defined as a normal to the surface, the Z axis is defined as a normal to a plane orthogonal to the surface and containing the center of gravity at a bottom of the swing and the swing axis, and the X axis is defined as being orthogonal to the Y axis and Z axis and parallel to the surface and wherein space above the origin is in a positive Y direction, space below the origin is in a negative Y direction, space behind the origin is in a negative Z direction, space in front of the origin is in a positive Z direction, space to the left of the origin when viewing from a negative Z position to a positive Z position is in a positive X direction and space to the right of the origin when viewing from a negative Z position to a positive Z position is in a negative X direction; wherein the center of gravity is positioned relative to the hit center such that when the hit center impacts a ball during a swinging of the golf club along a swing plane angled between 40 and 60 degrees to the surface, with the face at the hit center oriented for maximum distance where distance is the sum of flight and bounce and roll distance as measured by the X and Z coordinates of the ball stop point in the impact reference frame, the center of gravity is positioned in a space defined as a partial ellipsoid described as those points P satisfying: ( ( 0.836 ⁢ P x - 0.501 ⁢ P y + 0.224 ⁢ P z - 0.492 ⁢ ⁢ inches 0.48 ⁢ ⁢ inches ) 2 + ( 0.549 ⁢ P x + 0.763 ⁢ P y - 0.341 ⁢ P z - 0.075 ⁢ ⁢ inches 0.35 ⁢ ⁢ inches ) 2 + ( 0.408 ⁢ P y + 0.913 ⁢ P z + 3.166 ⁢ ⁢ inches 2.20 ⁢ ⁢ inches ) 2 ) ≤ 1 where P X , P y , and P z are the X, Y, and Z coordinates, respectively, of a point P in inches from the hit center origin of the impact reference frame and where 0.408P y +0.913P z +3.166 inches≧0 inches.