Patent ID: 8444501

Claim:
A set of at least three golf clubs having different club lengths L k , each of the golf clubs having a shaft with an upper end and a lower end, a grip section on the upper end of the shaft, and a head with a ball-striking surface mounted on the lower end of the shaft, the club length L k of each golf club decreasing through the set, each golf club having a balance point length L BP,n defined from the distal end of the grip section to a balance point BP, and a club weight m k,n , wherein a value of at least one torsional moment for each of the at least three golf clubs when swung by a golfer differs from each other, and a linear function of club length L k is based on said values of at least one torsional moment, each golf club generates when swung by the golfer: a first torsional moment PCF n at a rotational centre for the swing motion of the golfer for each golf club, and a second torsional moment ICF n at the wrists of the golfer for each of the at least three golf clubs having a relationship to said first torsional moment PCF n expressed as: ICF n = ( PCF n ( L BP , n + L a ) · m k , n - a h ) · L BP , n · m k , n wherein ICF n is the second torsional moment, PCF n is the first torsional moment for golf club n having a balance point length L BP,n and a club weight m k,n , a h is a constant representing acceleration of the wrists of the golfer when hitting the ball and L a is a constant related to the golfer's arm length.