Golf club shaft fitting method

摘要

A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer. The method includes the steps of obtaining measurement values from a sensor attached to a grip of a golf club; determining address, top, and impact of a swing from the measurement values; and selecting a shaft that matches a golfer through a usage of the swing characteristic amounts and values.

主权项

1. A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer, the method comprising the steps of:
obtaining measurement values from a sensor attached to a grip of a golf club and capable of measuring angular velocities about three axes when a golf ball is hit by the golf club; determining address, top, and impact of a swing from the measurement values; and selecting a shaft that matches a golfer through a usage of the following swing characteristic amounts of (a) to (d) obtained from the measurement values:
(a) amount of change of grip angular velocity in a direction of a wrist release around the top;(b) an average value of grip angular velocity in the direction of a wrist release, from the top to a point during a downswing where a grip angular velocity in the direction of a wrist release becomes a maximum;(c) an average value of grip angular velocity in the direction of a wrist release, from a point during a downswing where a grip angular velocity in the direction of a wrist release becomes a maximum to the impact;(d) an average value of grip angular velocity in the direction of a wrist release, from the top to the impact, wherein the above described (a) to (d) are respectively measured so as to correspond to bending stiffnesses of the shaft at plural positions including a position at a front end side of the shaft and a position of the shaft near hands of the golfer, an approximate expression that is created in advance with test-hitting and that represents a relationship between bending stiffnesses of the shaft and each of the swing characteristic amounts of (a) to (d), and the swing characteristic amounts of (a) to (d) obtained from the measurement values, are used to acquire bending stiffnesses of the shaft plural positions including a position at a front end side of the shaft and a position of the shaft near hands of the golfer, and from multiple shafts whose bending stiffnesses are measured in advance at the plural positions, a shaft matching a golfer is selected based on the acquired bending stiffnesses of the shaft at plural positions.