LifeNRA Posted June 26, 2007 Report Share Posted June 26, 2007 I have a scale, my arrows are 404 grains, thats with a broadhead. I also found that my FOC is 10.5%. This web site 7-10 is ideal. This was done through measurements only. Still not sure if I have the right numbers! So I guess I need to say HELP!!!!!!!!! I went to GoldTips web site, not sure what I need to do! Here is what I have. Shafts are 28.750" long, from insert to nock end, 5575 - 8 grains per inch Total length is from point to nock end is 30.25" 100 grain FT's and BH's. Bohning Blazer vanes (3) Bohning Signature nocks 4" wraps Total shaft weight is 404 grains. I'm I doing this right????? :confused::confused::confused: Quote Link to comment Share on other sites More sharing options...
LifeNRA Posted June 26, 2007 Author Report Share Posted June 26, 2007 Shafts are 28.750" long, from insert to nock end, 5575 - 8 grains per inch Total length is from point to nock end is 30.25" 100 grain FT's and BH's. Bohning Blazer vanes (3) 15 grains Bohning Signature nocks 13 grains 4" wraps ??? 5 grains maybe? Shaft Length:28.750 Shaft Weight:8 GPI Nock Weight:13 Fletching Weight:15 Fletching C.O.G.???????????? Tip Weight:100 grain Balance Point:10.05% Is this right? Quote Link to comment Share on other sites More sharing options...
Bownarow Posted June 26, 2007 Report Share Posted June 26, 2007 You should be able to figure your FOC fairly easily by using the following formula. You will need an accurate measurement of where your balance point it, and that should be measured from the front of the arrow. I've figured 9% to 15% was good for hunting, while 7% to 9% is more ideal for target shooting. As with everything I put on here, take it for what it's worth. (meaning, maybe not much!) %FOC = [((.5 * L)-BP)/(L)]*100 L = Total Arrow Lenght BP = Balance Point Quote Link to comment Share on other sites More sharing options...
LifeNRA Posted June 26, 2007 Author Report Share Posted June 26, 2007 Thanks for the response! 28 views and you helped! I tried this last year and never got it. Just didnt want to ask again. Not sure if I still got it or not! LOL! Really thought the other experts would chime in as well! But thanks again!!! Quote Link to comment Share on other sites More sharing options...
VermontHunter Posted June 26, 2007 Report Share Posted June 26, 2007 Heck !! John I'm just as lost as you are when it comes to this FOC thing,,, I totally stink with numbers .. :( I look at it this way ,,, if they don't wobble and fly true, I ain't worrying about the FOC numbers... Quote Link to comment Share on other sites More sharing options...
hutchies Posted June 26, 2007 Report Share Posted June 26, 2007 Sorry I didn't see this sooner. The FOC determines how the arrow balances in flight. 8-12 is a where you need to be. Broadheads alway seem to fly better on the higher end of the spectrum. There are 3 ways to figure FOC. The first is by measurement, by component weight, and the last is by running it thru a generic calculator which has most shafts in it. You can do all 3 thru Jackson Archery. Go here, http://home.att.net/~sajackson/archery.html, and go to the FOC and weight tab. It will have all 3 ways you can do it. Just punch in the info and it will give the percentage. Quote Link to comment Share on other sites More sharing options...
Gator Posted June 26, 2007 Report Share Posted June 26, 2007 I came up with 11.14 on GT's site. That is fairly close. GT recommends 8-12% for FOC. Hope this helps Quote Link to comment Share on other sites More sharing options...
hutchies Posted June 26, 2007 Report Share Posted June 26, 2007 Hey LifeNRA, You still shooting supercarbons? Quote Link to comment Share on other sites More sharing options...
Leo Posted June 26, 2007 Report Share Posted June 26, 2007 Most folks miss when they are actually measuring FOC. IE. Finding the balance point itself, that TOTAL ARROW LENGTH INCLUDES tip of the point to tip of the nock. Because of this you'll find your FOCs differ between point type (broadhead vs fieldpoint). It's not just the weight that affects FOC, ultimately the distribution of that weight is also important. Quote Link to comment Share on other sites More sharing options...
LifeNRA Posted June 27, 2007 Author Report Share Posted June 27, 2007 Heck !! John I'm just as lost as you are when it comes to this FOC thing,,, I totally stink with numbers .. :( I look at it this way ,,, if they don't wobble and fly true, I ain't worrying about the FOC numbers... Me too! Which is why I am in here asking! LOL! Arrows always looked like they flying straight into the target. But last fall someone said they are kicking a bit right out of the bow! So now that the off season is here I want to correct this! So I thought better start with the arrows before I paper tune for the first time! Hey LifeNRA, You still shooting supercarbons? Yes I am. Still got about five dozen of them too! Most folks miss when they are actually measuring FOC. IE. Finding the balance point itself, that TOTAL ARROW LENGTH INCLUDES tip of the point to tip of the nock. Because of this you'll find your FOCs differ between point type (broadhead vs fieldpoint). It's not just the weight that affects FOC, ultimately the distribution of that weight is also important. I got three different numbers when putting in the info, the different ways to figure FOC. Started to think I was not doing something right! Which creates a slight panic in me, because I never done this before! It appears that I am in the ballpark. But I wanted somebody else's opinion on this! Where better place to get a few answers! It sat for 24 hours and I had one response, I know this time of year is slow. LOL! I want to get this end figured out before I paper tune on Friday! Didnt mean anything bad, just thought the archery experts would jump on this like a dog to a bone! LOL! :rolleyes: I think I might be catching on a little bit more! Just affraid to tackle things I am not sure about! Thank you!!! Quote Link to comment Share on other sites More sharing options...
wtnhunt Posted June 27, 2007 Report Share Posted June 27, 2007 Kind of interesting there, using hutchies link, tried the measurement method and came out at 8.2 percent foc, but with the component method punching in weights and lengths came up with 10.1. Guess my knock and insert weights according to specs may be just a tad bit off and the best method is probably to actually balance your arrow and check measurements that way. Quote Link to comment Share on other sites More sharing options...
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