US Patent 7699716 Set of iron clubs with constant ground roll

A set of iron clubs where each club in the set has the same or substantially the same ground roll. The set is produced by adjusting at least two club design characteristics of the clubs based upon measured or assumed player swing data. The design characteristics of the clubs include club length, static clubhead loft, location of the center of gravity, shaft flexibility, and groove volume. Preferably, club length and static clubhead loft are adjusted for coarse adjustments, while the other characteristics are used to fine-tune the design.