New String-Slow Bow

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This topic contains 3 replies, has 3 contributors, and was last updated by jcmullins jcmullins 1 year, 1 month ago.

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  • September 10, 2013 at 11:53 am #594271 Back to Top REPORT
    jcmullins
    jcmullins

    Age: 37
    Joined: 9/9/2011
    Location: GA
    Ok, just had a new string and cable installed on z7 extreme. Bow seems to be in spec and cable is running through timing hole. 26.5 in draw, 70lb limbs turned all the way down. (Not positive of actual draw weight) Arrow weighs 376 grains. Bow is shooting bullet holes through paper and seems to be doing well. The chrono shows 256fps. Using arrow speed calculators online it should be closer to 280fps. Is there something obvious I’m missing.

    Thanks in advance for all help.

    September 10, 2013 at 2:56 pm #594295 Back to Top REPORT
    gjarcher
    gjarcher

    Age: 71
    Joined: 10/3/2006
    Location: Colorado
    View My Bows
    What online calculator are you using … no way should you expect 280 fps?

    Using Rule of Thumb:
    IBO Rating 330 fps
    Subtract 20 fps for DW 60# < 70# = 310 fps
    Subtract 35 fps for DL< 30″ = 275 fps
    Subtract 7 fps for Arrow Wt > 350 gr = 268 fps
    Subtract 5 fps for Peep/D-Loop – 263 fps

    Online BackCountry Calculator estimates 261 fps.
    http://backcountrybowhunting.com/articles/calc/

    Without knowing the precise DW, and precise specs, I’d say you are getting about rated speed out of your setup. {#emotions_dlg.mathews_peace}

    September 10, 2013 at 3:41 pm #594300 Back to Top REPORT
    q2hunter
    q2hunter

    Joined: 6/21/2007
    Location: Virginia
    Not sure I am understanding %100 one part of your statement.  “limbs turned all the way down”.  So are you shooting at MAX poundage, or MIN poundage?  I think you are saying max poundage, in which case your speed is low, by pretty much the 20fps Brian has listed for your bow being on 60lbs.  If you are shooting 60lbs, then you are about right.
    September 10, 2013 at 3:52 pm #594302 Back to Top REPORT
    jcmullins
    jcmullins

    Age: 37
    Joined: 9/9/2011
    Location: GA
    Sorry…not clear there. Maxed out so turned all the way up. Sorry gjarcher. I meant to say that it should be in the neighborhood of 70lbs. I am assuming 70lbs in my calculations online.
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