Abstract: An improved set of golf clubs has iron club heads in a correlated set such that the weight of longer shafted, less lofted clubs is concentrated more towards the heel of the head, while the weight of the shorter shafted, more lofted clubs is concentrated more towards the toe of the head. When viewed face on, with the sole of the club on a level surface, it will be noted that the vertical plane of the center of gravity of each individual head shall be shifted towards the toe or the heel, as the case may be, with such weight concentrations. The result is a set of correlated golf club heads which: (a) have less inertial drag in the longer, less lofted clubs, (b) have more inertial drag in the shorter, more lofted clubs, and (c) can utilize the gear effect phenomenon inherent in golf clubs more effectively.

Abstract: A golf club head has a pyramid-shaped truss located within an interior of the club head. The truss employs a triangular base placed directly behind a club head striking plate, with a plurality of struts extending from the base to converge at an apex at the tail of the club head. Two of the struts are preferably affixed to an inner side of a club head sole. The struts may be tubular or solid. The truss prevents distortion of the club head at head-ball impact, and also reduces the tendency of the club head to twist about its center of gravity when contact is made with the ball. The truss is particularly applicable to hollow, metal "wood" club heads, which typically must be designed with thinner striking plates. The truss also facilitates manufacture of composite graphite club heads by inexpensive injection molding techniques without compromising club head strength.