| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase a flight distance with a club with a small loft angle, and meanwhile to stabilize a flight distance of a hit ball with a club with a large loft angle. <P>SOLUTION: This iron type golf club set 1 includes a set of n iron type golf clubs, n being an integer of 3 or more, each having a different loft angle. Concerning the clubs of the set, the head moment of inertia A per unit mass represented by a ratio MI/m of the moment of inertia MI of the head alone around a horizontal axis passing through the head center of gravity and being parallel to the face with respect to the head mass m increases in the order from the iron type golf club with the smallest loft angle to the iron type golf club with the largest loft angle. Besides, a difference An-A1 between the moment of inertia An of the head per unit mass of the club with the largest loft angle and the moment of inertia A1 of the head per unit mass of the club with the smallest loft angle is ≥0.30 g-cm<SP POS="POST">2</SP>/g. <P>COPYRIGHT: (C)2013,JPO&INPIT |
