Home › Forums › Bows and Equipment › I increased my FOC!!!!

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    • Chris Shelton
        February 2, 2010 at 6:03 pm
        Post count: 679
        #5323

        Well I decided to up the weight of my arrows and increase my FOC. I was shooting Beeman ICS Bowhunter shafts at a total grain weight of 347.2 before, with 7 gpp. My foc was 13.64%

        And today I received my brass inserts. I went 100 grains and man are they sweet!!! So now I am shooting 447.2 grains, which is 8.64 gpp(still a bit shy), and my FOC is 18.64%, and the best news is that my flight is almost identical, just a wee bit slower, and about a inch or so low out to 30 yards. Which in the feild I rarely take shots beyond 25 yards. So during the summer I will play with bh weight, and have a arrow above both the 9 gpp and 19% FOC threshold!!!

        Edit: Question/concern- my new brass inserts have a tiny, tiny lip above the shaft, you can not see it, you can only feel it, approximatly like half of a micro mm(I dont even know if that is a measurement?), could this be a problem?

      • Patrick
        Member
          February 2, 2010 at 6:54 pm
          Post count: 1148
          #39578

          GTA/Chris, how many pounds are you shooting? Just curious.

        • Ed Ashby
          Member
            February 2, 2010 at 7:54 pm
            Post count: 817
            #39634

            Chris, that ‘lip’ on the insert won’t be a problem so long as it still represents a ‘step down’ from the diameter of the broadhead’s ferrule and/or the diameter of any broadhead adaptor used. Basically, from the broadhead ferrule backwards you want ever change in the arrow’s diameter to represent a decrease in diameter as the arrow penetrates.

            Hope that helped,

            Ed

          • MontanaFord
              February 4, 2010 at 3:01 am
              Post count: 450
              #41255

              Basically, Ed, if I’m reading that right, you want everything from the widest point of the arrow (the outermost reach of the broadhead blades) to the nock of the arrow to represent a “taper” so to speak, even if the arrow shaft itself doesn’t actually taper (such as the Grizzly Stik). Correct me if I’m wrong or off in what I wrote.

              Michael

            • Ed Ashby
              Member
                February 4, 2010 at 3:57 am
                Post count: 817
                #41308

                Michael, Yes, a ‘taper’ is good; a ‘reverse taper’ is bad. It’s not so much wanting a taper as it is not wanting anything to step up in size (get larger).

                It’s amazing, but even a VERY TINY ‘bump’, or step-up, along the way causes a measurable decrease in average arrow penetration into tissues.

                Ed

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