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arrow spine

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Jjpso:
hello there!
i have one question!
i understand all the consideratiobns that affect the spine (length of the arrow, point weigth, recurved or not, fastfligth or dacron, distrance to center shot)

imagine i have a 55-60 arrow, 30 inches long and with 100 grain point, dacron, close to center, not recurved. that arrow will behave like a 50-55 arrow, if i am not mistaken.
but how does draw length changes this?! for instance, what will be the dynamic spine of that same arrow, if the draw length is 25 inches?
regards

Joćo

Jon_W:
If you compare the same arrow on the same bow with differing draw lengths the shorter draw would make the arrow appear stiffer. The relation of how the arrow reacts to changes in bows is what makes the spine under or over spined. As far as I know if you had the exact same bow but one was 50# at 28" and the other 50# at 25" the dynamic spine of the arrow would be the same. But a 50# @ 28" bow only drawn 25" would result in the arrow spine increasing.

Other people will know far more than me though so I am ready to learn from them as well! I could very well be wrong. Playing around with the 3rivers spine calculator may help with some of the theory as well.

https://www.3riversarchery.com/dynamic-spine-arrow-calculator-from-3rivers-archery.html

Jjpso:

--- Quote from: Jon_W on March 02, 2021, 01:25:39 pm ---If you compare the same arrow on the same bow with differing draw lengths the shorter draw would make the arrow appear stiffer. The relation of how the arrow reacts to changes in bows is what makes the spine under or over spined. As far as I know if you had the exact same bow but one was 50# at 28" and the other 50# at 25" the dynamic spine of the arrow would be the same. But a 50# @ 28" bow only drawn 25" would result in the arrow spine increasing.

Other people will know far more than me though so I am ready to learn from them as well! I could very well be wrong. Playing around with the 3rivers spine calculator may help with some of the theory as well.

https://www.3riversarchery.com/dynamic-spine-arrow-calculator-from-3rivers-archery.html

--- End quote ---
thanks for your answer. so for example, we have 2 bows, one is 50# at 28", and the other is 50# at 25", and both have the same characteristics. they both shoot an arrow the same length and same point weight, but if the first bow would accept an arrow 50-55 (just an example), the second would need an arrow 35-40! is this correct?

Jon_W:
If they were the exact same bow except one was 50# @ 28" and the other 50# @ 25" then they would shoot the same arrow the same way (in theory). So if the first one shot a 50-55 spined arrow, the second one would shoot it the same. Always worth testing it out too! And no two bows will ever be the exact same except for draw weight. Hope this helps!

Todd Mathis:
Those are good answers to your question.  I would trust those to be an excellent place to start.  The only addition for me is that in time you will see that follow through will play a larger role than you might think too!  The things I am still learning!!! 

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