The present invention relates to methods for optimizing the flexibility of each shaft comprised in a set of golf clubs. In general, based on a golfer's estimated swing speed, skill level and/or other relevant factors, an appropriate category of golf club shafts is selected. Each category of golf club shafts employ a unique range of shaft flexibility. The range of flexibility exhibited by categories of golf club shafts optimized for golfers with relatively higher swing speeds is greater than the ...

Disclosed is a golf club set having harmonized golf club performance among the club numbers. In the golf club set, for at least three golf clubs, a ratio or a sum of a frequency, the frequency being measured by vibrating a tip portion of a golf club shaft constituting each of the golf clubs, and a frequency, the frequency being measured by vibrating a rear end portion of the golf club shaft, is determined in relation with order of the club number.

Disclosed is a golf club set having harmonized golf club performance among the club numbers. In the golf club set, for at least three golf clubs, a ratio or a sum of a frequency, the frequency being measured by vibrating a tip portion of a golf club shaft constituting each of the golf clubs, and a frequency, the frequency being measured by vibrating a rear end portion of the golf club shaft, is determined in relation with order of the club number.

A hybrid golf club shaft set is provided that includes at least two of the group including a composite shaft subset including shafts formed entirely of composite, a composite/metal shaft subset including shafts formed of composite/metal combination shafts, and a metal shaft subset including shafts formed entirely of metal.

Disclosed is a golf club set having harmonized golf club performance among the club numbers. In the golf club set, for at least three golf clubs, a ratio or a sum of a frequency per unit time, the frequency being measured by vibrating a tip portion of a golf club shaft constituting each of the golf clubs, and a frequency per unit time, the frequency being measured by vibrating a rear end portion of the golf club shaft, is determined in relation with order of the club number.

A golf club matching method in which the ideal shaft stiffness for a particular golfer is first empirically determined using calibrated test clubs. The shafts are incrementally trimmed to result in a set in which each club has the same or ideal shaft frequency or stiffness. The manufacturing method may be automated using a computer controlled cutting operation to fabricate a number of matched club shaft blanks by inputting information relative to the desired stiffness, shaft blank characteristic...

A hybrid golf club shaft set is provided that includes a composite shaft subset including shafts formed entirely of composite, a composite/metal shaft subset including shafts formed of composite/metal combination shafts, and a metal shaft subset including shafts formed entirely of metal. The composite shaft subset preferably includes the long irons with the lowest lofts such as the two, three, and four iron shafts. The composite/metal shaft subset preferably includes the middle irons with medium...

A golf club shaft (1) in which a difference between a maximum EI value and a maximum EI value in the range from a tip (1a) to a position spaced therefrom at a distance corresponding to not less than 40% nor more than 60% of the whole length of the shaft (1) is set to less than 10% of the average of the maximum EI value and the minimum EI value in the range. The diameter of the tip (1a) of the shaft (1) is set to not less than 9.0 mm nor more than 12.0 mm. The shaft (1) is applied to an iron club...

The preferred orientation, or planar oscillation plane, of a golf club shaft is located by measuring the oscillation of the shaft when an impulse is applied. Preferably, the out-of-plane oscillation is measured at a large number of angular positions about the shaft axis, and the principal planar oscillation plane is identified by that pair of opposed angular positions in which the out-of-plane oscillation is smallest. The location of the preferred orientation may be marked on the shaft and used ...

A golf club set which comprises a plurality of golf clubs having shafts of different tapered section lengths, at least two golf club shafts of the set having differing taper lengths and preferably differing taper angles, the tapered section length of the shaft increases as the shaft length increases for each club throughout the set, and vice versa. Accordingly, each shaft throughout the set of shafts has a distinct taper length. The distinct variable taper clubs provide efficient energy transfer...