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Over spine

Discussion in 'Tech Talk' started by tkarrow, Feb 16, 2015.

  1. tkarrow

    tkarrow Weekend Warrior

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    What happens if I over spine my arrows?

    Tom
     
  2. trial153

    trial153 Grizzled Veteran

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    An arrow has to flex because the bow string will apply force from the nock end of the arrow. When your overspineded an arrow it tends to impact left with bare shafts. Th reason for this is because no matter how good a release we have its never exactly perfect( inline) and an over spined shaft will under correct for a right handed shooter.

    You can paper tune and make some simple adjustment that will hide an overspined arrow, however when you shoot that same arrow without fletching the problems will come up again, same can be said for shooting an over spined arrow with fixed blade heads.


    The best way to illustrate spine is via a graph or sliding scale. After inputting all the available data to come up with an ideal...then you can see how acceptable range you have in each direction.
     
  3. tkarrow

    tkarrow Weekend Warrior

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    So I am looking at GT Kinetic XT or Hunter. I shoot about 65b's, at 30 inch draw so from what I understand up until this year (2015) I could not have used these arrows because they were not available in a 340, only a 300 and that would be too much over spine??

    For 2015, they make a 340... fricken ugly but 3 a 340 none the less.

    Tom
     
  4. trial153

    trial153 Grizzled Veteran

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    Yes gold tip for years in some arrows didn't feel the need to make a .350 spine. Mostly because of one persons belief there that it's was unnecessary in a hunting shaft.
    After years of losing sales because of it they have since changed an started offering it.


    What arrow length are you planing on shooting ? Then we can talk options ...30" draw 65#....now we need an arrow length
     
  5. ShaneB22

    ShaneB22 Die Hard Bowhunter

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    An over spined arrow isn't a problem. Go one YouTube and watch Tim Gillingham explain or just call Gold Tip and you can talk to him over there.
     
  6. trial153

    trial153 Grizzled Veteran

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    Have you ever shot an over spined bare shaft at 20 yards?
    How did that look for you? Please enlighten us.

    And you keep making reference to GT ...why is it that they sell arrows from .200 to .600 spine? Is it for just for the hell of it?
     
  7. ShaneB22

    ShaneB22 Die Hard Bowhunter

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    If I were you I would go with a GT Hunter in a 300 spine or you could go stiffer if you want but you seem a little concerned about being over spined. My set up is 27" draw 70lbs and I shoot 300 spine GT Velocity cut to 26.5" with VaneTec Super Spine vanes in a 4 fletch pattern.
     
  8. Dubbya

    Dubbya Moderator

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    I guess my main question is, "Why would you purposely over spine your arrows?" Are you trying to get a heavier arrow? If you are going to use a 300 spine, then you need to add weight up front to help weaken the spine. This can be done by adding weighted inserts and shooting heavier broadheads.

    But the easiest way, would be to get a properly spines arrow, like a 340-350 and not have any issues.
     

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