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I am trying to understand an equation which I have come across for determining a coefficient based on the size of dimples on a golf ball :

C_{D_Size}= R_{1}·(-3.125·(c/d)+0.25)

In the description, it indicates that R_{1}indicates a weight ratio of C_{D_Size}.

Can anyone please explain what R_{1}is and how it is to be calculated?

FYI. the paper this came from can be found on this link :

http://www.ijimt.org/papers/419-D0260.pdf

Many Thanks,

Andy.

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# Help understanding coefficient formula

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