Callaway Golf Company

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Steven M Ehlers

John B Kosmatka

Matthew J Erickson

Richard C Helmstetter

Matthew T Cackett

Herbert Reyes

James M Murphy

A method ( ) and system ( ) for predicting a coefficient of restitution (COR) of a golf club ( ) or golf club head ( ) is disclosed herein. The system ( ) and method ( ) are able to predict the COR in a non-destructive manner for a particular golf ball and impact speed. The system ( ) and method ( ) utilize a vibration sensor ( ) attached to the face ( ) of a golf club ( ). The vibration sensor ( ) is excited with an excitation device ( ), and data is transmitted to an analyzer ( ). A mathematical model of the golf club ( ) is created allowing for the coefficient of restitution to be predicted without destroying the golf club ( ).

Measurement of the coefficient of restitution of a golf club

A high moment of inertia golf club head composed of a composite material and having a weight strip in a ribbon section is disclosed herein. The weight strip may be composed of copper, tungsten or a similar metal. The moment of inertia, Izz, of the golf club head about a vertical axis Z through the center of gravity ranges from 2800 g-cm to 5000 g-cm , and a moment of inertia, Iyy, about a horizontal axis Y through the center of gravity of the golf club head ranges from 1900 g-cm to 2500 g-cm . The golf club head is preferably composed of plies of pre-peg sheets. The volume of the composite golf club head varies from 300 cm to 600 cm .

High moment of inertia composite golf club head

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Carlsbad, CA, United States of America

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