Jul
06
06
How Do I Calculate Golf Club Speed From Ball Velocity And And Coefficient Of Restitution?
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Coefficient of restitution will give the following:
e=(v_ball – v_clubafter)/(v_clubbefore)
Velocity of the ball before is zero, so that doesn’t enter into the equation.
How do I figure out v_clubbefore if I don’t know v_clubafter
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You can’t. First of all you need the COR for both the ball AND the club head and the first problem you run into is the the COR for the club head varies depending on the precise point of impact as well as varies by clubhead type and style. One Thing working in your favor is that the COR numbers for a given clubhead can be found from many manufacturers websites but even then you have a problem since the published number has a 10 % “fudge factor” built in. so the actual COR is usually up to 10% higher than the published COR. I know from actual testing that at high swing speeds 120 MPH or more the ballspeed is around 1/3 greater than the clubhead speed but the problem with calculating these is the reason why radar is used as well as high speed photography.
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