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 FOBs and single bevel broadheads

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roosclan



Posts : 51
Points : 69
Join date : 2011-02-12

PostSubject: FOBs and single bevel broadheads   Wed Sep 07, 2011 1:23 am

I am having some difficulty with my broadheads. I tried some of my friend's Magnus Stingers and they grouped just fine (4" at 30yds), however, the ones I have don't group too well. They are single bevel instead of dual bevel, and I'm wondering if the single bevel of the broadhead is fighting against the offset of the FOB. I'm going for higher FOC, heavier weight, and single bevels to aid in penetration, so I would like to stick with single bevels if I can (Massai, Samaurai, Ashby, etc.). I don't exactly have the funds to buy different broadheads, but if the FOBs don't work with single bevel blades then I won't have a choice for this season, and I'll cough up the money for some 150gr Buzzcut 2-blades. Of course, if there is no problem between the two, then I need to look at what's causing the wandering impact point (I do have only 1/8" clearance between my FOB and cable, although I can find no evidence of contact with the cable).

Has anyone heard of issues between single bevel broadheads and FOBs, perhaps having two rigid airfoils causes them to work against each other and cause erratic flight?
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Fryguy
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Location : Indiana

PostSubject: Re: FOBs and single bevel broadheads   Wed Sep 07, 2011 3:03 pm

let me do some checking on that and I will get back to you soon.
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Fryguy
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PostSubject: Re: FOBs and single bevel broadheads   Wed Sep 07, 2011 7:01 pm

Ok I talk to Paul and this is what he said..

First place to start is blade indexing to the FOB fin. Try different positions combinations (blades at 12 and 6, then at 9 and 3 oclock. You may find that the seam of the arrow needs to be in in a certain place. If rotaing the arrows/FOBs work and you find a good sweet spot, mark them and call good. You may also find that some arrows group great and some do not. Mark the flyers and put aside for now. If the FOBs are all over the place something is a miss and You should call Him. My bent Zwickey's will group better than 4" at 30.

Thanks!
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roosclan



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PostSubject: Re: FOBs and single bevel broadheads   Wed Sep 07, 2011 10:33 pm

Fryguy wrote:
Ok I talk to Paul and this is what he said..

First place to start is blade indexing to the FOB fin. Try different positions combinations (blades at 12 and 6, then at 9 and 3 oclock. You may find that the seam of the arrow needs to be in in a certain place. If rotaing the arrows/FOBs work and you find a good sweet spot, mark them and call good. You may also find that some arrows group great and some do not. Mark the flyers and put aside for now. If the FOBs are all over the place something is a miss and You should call Him. My bent Zwickey's will group better than 4" at 30.

Thanks!

Well, apparently it was the broadheads. They sent me a new 3-pack, and they fly much better. I had two in a 2" spot, with one flier that was off by about 8". I switched to a different shaft with that broadhead and the group shrank to an acceptable size for shooting with the last bit of available light (the target rotated after the first shot which is why the arrows are off-kilter):


So, FOBs do work with single-bevel heads. Now I just need to tweak the arrows to shrink the groups some more, and broadhead tune. Then I need to practice as much as humanly possible in the 2 weeks left before archery season!
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Fryguy
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PostSubject: Re: FOBs and single bevel broadheads   Thu Sep 08, 2011 3:11 pm

Glad to hear that everything is working for you..Good luck this year
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