RE: FOC
100 (B-L/2)
-------------
L
B= Distance from nock to ballance point
L= total arrow length
Example of my arrows: total arrow length is 31.5" (L) distance to ballance point is 20" (B).
100 (20 - 31.5/2)
-------------------- = 13.49%
31.5
Bowjackson gives me 13%
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