Measuring and testing – Center of gravity; turning moment; metacentric height – Ball driving sporting implement
Patent
1997-02-21
1998-08-11
Dougherty, Elizabeth L.
Measuring and testing
Center of gravity; turning moment; metacentric height
Ball driving sporting implement
473292, A63B 5300
Patent
active
057929467
ABSTRACT:
A method for dynamically balancing any one or a plurality of golf clubs wherein each club in the plurality of clubs is balanced to the same equivalent pendulum length, the present method being based upon simulating the dynamic characteristics associated with swinging any particular golf club by using the dynamic equations describing simple pendulum motion wherein the equivalent pendulum length of any particular golf club is represented by any one of the following equations: ##EQU1## where EPL=the equivalent pendulum length of the club; Q=the shaft or center of percussion length of the club; r=distance between the center of gravity of the club and the grip end thereof; and K=the radius of gyration of the club. The present method also automatically balances all clubs in any particular plurality of clubs to a common period of oscillation and is particularly adaptable for use in pendulum length balancing of graphite shafted golf clubs. The present method is a more refined method for pendulum length balancing of golf clubs as compared to the method disclosed in Applicant's U.S. Pat. No. 5,608,160 and is more specifically designed for correcting swing deficiencies associated with the more skilled or professional golfer.
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