913f vs 913fd

Started by : Adam H |

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Adam H

Can anyone tell me in real numbers what the difference in launch, spin, and ball speed is between the F and FD?  My local fitter is very limited on shafts in their fitting cart so testing is not as meaningful.  But they said from what they have seen its less about difference in numbers and more about what size head you like to play.  The larger FD or the smaller F.

How much higher with how much more spin and less ball speed would be seen on equivalent strikes between the two heads?  Even if its machine testing.