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  1. #1
    Member
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    Apr 2006
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    Default What about my F.O.C.!!!!

    I am shooting Fatboy 400's at 28" with 80 grain glue ins and 2 inch blazers, unibushing and super nock. According to the GT website, my foc is at about 6.79% and if I up it to 100 grain points it will put me over 9%. How much of a factor is this going to be in getting arrows to fly straight. I have a little movement on my arrows, but unsure of foc or if it is my bow or me torquing my bow. I know ideally your foc should be between 8-10 %.


    thanks and good shooting
    Switchback 28"
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    Easton Fatboy 400 (344 grains- 260fps@58lbs)
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    "A bad day of target shooting is still better than a good day of work".

  2. #2
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    Mar 2006
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    NW Iowa
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    61

    Default Foc

    Adding or subtracting anything from your shaft/arrow will weaken or stiffen the spine, worry about that more than the FOC. If you arrows are going in straight at 20 and 40 yrds, and your groups are good, don't worry too much about your FOC. I didn't say not at all, but FOC is more for FITA shooters than anyone else. FOC is one of the last things I worry about, as long as everything else it good. Are you having problems with left and rights?
    Keith
    NBEF Instructor
    South Dakota - Iowa

  3. #3
    Evil Genius brokenarrow's Avatar
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    Question F.o.c.??

    In the interest of learning something new everyday, what is F.O.C.??


  4. #4

    Default

    FOC = Front of Center. It shows what % the balance point of the arrow is from the exact middle. Basically the front of the arrow should be heavier than the back if you want a good flying arrow. Typical hunting arrows are usually 9-12%. Target arrows 7-10%.
    Chris Christenson - Admin
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  5. #5
    Evil Genius brokenarrow's Avatar
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    Thumbs up Thanks

    Thanks for the info Chris. Now I'm 1 step closer to knowing everything.


  6. #6
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    Mar 2006
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    NW Iowa
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    Default FOC Specific

    I just thought I would break it down....

    If "L" is the length of the shaft, and "D" is the distance from the center of the shaft to the center of gravity, then the FOC is 100xD/L.
    Keith
    NBEF Instructor
    South Dakota - Iowa

  7. #7
    I pray for you! BUNNYMAN's Avatar
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    Apr 2005
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    Default

    I thought this was an archery web sight, not a math wiz kid help site , I think you lost me at at L

    Does the D go over the L, let me guess were doing fractions?????
    I cut things up and split them down!

  8. #8
    Evil Genius brokenarrow's Avatar
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    Talking new math

    1 arrow + 1 target / 1 tree = Brokenarrow


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