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Main Boards => The Shooters FORM Board => Topic started by: Michael Pfander on January 21, 2010, 08:10:00 PM
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I have been playing around with arrow tuning. My question is simple, how much difference in draw length should a properly tuned arrow and bow combination accept before showing stiff or weak spine? The reason I ask is that one of the guys I shoot with draws 2" more than I do and when he shoots my bow and arrows there is little or no change. But when I work on odd positions they show stiff, meaning I am short drawing my setup.
Thanks
MAP
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Looking at several arrow selection guides, it looks like there's a jump between spine every 5 pounds. If I remember correctly, there's a 3 pound increase for every inch above 28 inches (should work to be about the same under 28 inches).
So, if my math is right, should work out to be a change in spine for every 1.6 inches. Pure math, not sure how it works in real life. :confused:
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There seems to be a difference in how different people shoot a bow. Two people can shoot the same bow at the same draw length and one will take a weaker arrow than the other. Or, as in your case, two people can shoot the same bow at different draw lengths and both take the same spine.
I can't explain it, but I've heard it from enough places that I believe it's true. Probably different releases and other subtle differences. The bottom line is, you have to tune the arrow for yourself to get the best tune.