Prediction of Initial Velocity from COR and Contact Time

The following paper includes the results of some research work conducted by The R&A and the USGA to investigate alternative methods of estimating the Initial Velocity of a golf ball.   The R&A and the USGA have found that Initial Velocity measurements may be estimated, with a high degree of certainty, through the measurement of both coefficient of restitution and contact time for impacts against a rigid, massive barrier.  The measurement of the coefficient of restitution will already be familiar to most golf ball manufacturers and the addition of a measurement of contact time should be relatively straightforward.


The R&A and the USGA are not contemplating any changes to the current conformance test methods for Initial Velocity or to the Rules limiting Initial Velocity.  This information is merely provided to manufacturers in order to assist them in estimating Initial Velocity measurements for themselves.


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