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Kinetic Energy

Discussion in 'Bowhunting Talk' started by INbowhunter, Nov 28, 2011.

  1. INbowhunter

    INbowhunter Die Hard Bowhunter

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    Hey guys I was just wondering what you guys think my KE is? I'm shooting a 322g arrow at the 55-60lb range...every calculator I've checked says I'm shooting 16lbs of KE, which I think is waaaay low. Any thoughts?
     
    INbowhunter, Nov 28, 2011
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  3. soccerdan90

    soccerdan90 Grizzled Veteran

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    Thats has to be wrong. I dont think that would penetrate very well on a deer lol.
     
    soccerdan90, Nov 28, 2011
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  4. Zeus72

    Zeus72 Newb

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    You are shooting 322 gr arrows, what is the speed that is arrow is traveling once shot it?

    Example: 322 gr arrows with an approximately 300 fps bow speed equals to approximately 69 KE
     
    Zeus72, Nov 28, 2011
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  5. Sticknstringarchery

    Sticknstringarchery Grizzled Veteran

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    The IBO on a bear Game Over is 305fps. I see you are drawing 60# @ 25". With a 322gr arrow your KE should be 40#.

    I use this calculator: http://www.backcountrybowhunting.com/articles/calc/ It has been almost dead on (+- 2-3 fps) on arrow spedd calculations I have done when compared to the chrono. You have to make sure you are using the correct IBO, Draw length, Draw weight and arrow weight though or it wont work right at all.
     
    Sticknstringarchery, Nov 28, 2011
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  6. INbowhunter

    INbowhunter Die Hard Bowhunter

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    Okay thank you all for replies! Helps out alot, makes me feel a bit better also!
     
    INbowhunter, Nov 28, 2011
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  7. Sticknstringarchery

    Sticknstringarchery Grizzled Veteran

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    You are welcome. I can see how that would make a person a little uneasy about putting an arrow in a deer.
     
    Sticknstringarchery, Nov 28, 2011
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  8. INbowhunter

    INbowhunter Die Hard Bowhunter

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    Yes after reading that before, made me rethink shooting a nice buck, but after all these posts I feel comfortable taking a deer.
     
    INbowhunter, Nov 28, 2011
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  9. geauxtigers1421

    geauxtigers1421 Weekend Warrior

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    Not really sure about all the technical stuff... How much KE is needed to make a clean pass thru with a good shot?
     
    geauxtigers1421, Nov 28, 2011
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  10. INbowhunter

    INbowhunter Die Hard Bowhunter

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    Do you think 40# of KE is enough to make a clean pass through?
     
    INbowhunter, Nov 28, 2011
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  11. Christine

    Christine Grizzled Veteran

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    What am I doing wrong?? It gives me 8 ft pounds of KE. !!??
    368 gr arrow, 26" draw, 40 lb bow, ~205 fps, a d-loop and remnants of string silencers.

    INbowhunter #40lbs of KE is plenty.
     
    Christine, Nov 28, 2011
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  12. geauxtigers1421

    geauxtigers1421 Weekend Warrior

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    Is 205 the manufacturers IBO Christine? Because that's what you need to put in that site, not what your bow is shooting
     
    geauxtigers1421, Nov 28, 2011
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  13. geauxtigers1421

    geauxtigers1421 Weekend Warrior

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    And does anyone know about how many grains a Easton FMJ 340 cut to a 28" draw would be with a 100" head?
     
    geauxtigers1421, Nov 28, 2011
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  14. Christine

    Christine Grizzled Veteran

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    Ah... IBO.. I can read, just not too well I guess.. (insert embarrassed smiley here)

    IBO is 300 fps.... so I'm right at about 30 ft pounds of KE.
     
    Christine, Nov 28, 2011
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  15. the mechanic

    the mechanic Weekend Warrior

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    My fmj's at 29" with blazers and wraps come out right at 480g. Hope that helps.
     
    the mechanic, Nov 28, 2011
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  16. geauxtigers1421

    geauxtigers1421 Weekend Warrior

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    Yes that helps, thanks! I just realized it also has something to help with arrow weight on the site... Mine are actually 264 grains because I don't have wraps so that leaves me with 70 ft pounds of KE
     
    geauxtigers1421, Nov 28, 2011
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  17. Rob / PA

    Rob / PA Grizzled Veteran

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    Christine, your setup is exactly 34.4 ftlbs of KE. 368 at 205 fps.
     
    Rob / PA, Nov 28, 2011
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  18. Christine

    Christine Grizzled Veteran

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    Thank you Sir!

    INbowhunter, I limit my range with my setup but within 25 yards or so, it kills deer just fine. :)
     
    Christine, Nov 29, 2011
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  19. Lady Forge

    Lady Forge Die Hard Bowhunter

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    LMAO... Christine at 8 lbs of KE at 30 yards the deer could just prance around in front of you...cause your arrows would just bounce off of them ;) I couldnt resist HEHEHEEEEEE
     
    Lady Forge, Nov 30, 2011
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