This study investigated the relationships between golfer hub path trajectories and interaction kinetics, andclub behavior. An equation of motion describing a flexible golf club system was derived and solved to yield time and clubposition deflection behavior during the downswing. This equation was applied to three diverse subjects whose kinematicand kinetic information was used to drive the simulation. It was determined that there is a relationship between the timingof the maximum interaction torque and the increase in normal force applied to the club and club head deflections. Also, itappears that there is a correlation between degree of radius reduction directly before impact and shaft deflection behavior.The timing of both torque and normal force are directly related to changes in hub path radius thus the effect of hub pathgeometry on club deflection behavior is secondary. Based upon these findings, a method for fitting shafts to specificswing characteristics was developed that optimized predicted carry distance. These results are based upon limitedsubjects.
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