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Arrow spine

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mikekeswick:
Just make another post for your spine tester. It is all relative anyway.

PatM:
Actual arrow flight trumps spine.

gfugal:
So based on the equation to the far right we can solve for a deflection from a shorter arrow to a longer arrow. The little squiggly thing in equation 2 represents deflection, therefore using the second equation you can solve for the theoretical deflection at 26 inches.

gfugal:
For example, If you measured a deflection of 0.35 inches at 24 inches then to get the deflection at 26 inches you plug it in.
 D1 = D2•(L1^3/L2^3) = 0.35•(26^3/24^3) = 0.35*(17576/13824) = 0.35*(1.27) = 0.44
Therefore the deflection at 26 inches is 0.44 inches or 59 lbs.

But like Badger said that's helpful if you want to compare to 26" shafts. If you don't care about that then just get a deflection value and use that to compare to other 24" or whatever length shafts you happened to measure.

Selfbowman:
Ace makes one that will spine a arrow 15" or so. It hangs on the wall . About a 100-150 bucks. I got one for a hundred at Denton Hill last summer.

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