How to Calculate Your Arrow FOC - Front of Center Arrow Weight

[@patrickjr3882]

Great video brother! I never knew this stuff lol

[@BackwoodsPursuit]

Thank you!!! Glad to help out and thanks for watching!

[@simonkash6571]

I realize Im pretty randomly asking but does anybody know of a good site to watch new series online?

[@muhammadryder9648]

@Simon Kash I watch on FlixZone. Just google for it =)

[@finnleyuriah5833]

@Muhammad Ryder Definitely, been watching on FlixZone for since april myself :)

[@simonkash6571]

@Muhammad Ryder thanks, signed up and it seems to work :D Appreciate it !

[@03bullseye]

If you only want to use a calculator, Mark the center point, mark the balance point. Measure the distance between the two marks and divide that number by arrow length. Then move the decimal to right two digits. Very easy without using another app.

[@BackwoodsPursuit]

For sure! Thanks for pointing that out!

[@feralgrandad4429]

Thanks for uploading, easy way to get in the ballpark for your FOC, useful. Smiled when you said "490g arrow so still heavy" .... Meanwhile I'm chucking 635g @ 22% from my recurve and thinking "hmmmm, I'll go for 700g" lol. Subscribed.

[@BackwoodsPursuit]

Haha....thanks😁. Yeah, "heavy" is relative to what you are trying to do for sure. Since that video I've gone up to a 585gr arrow and it's been flying well from the compound. Thanks for watching!

[@enjoytheoutdoors101]

Thanks for the info. I'm doing a few changes with my FOC to find that sweet spot.

[@BackwoodsPursuit]

Awesome man! What FOC are you shooting for?

[@enjoytheoutdoors101]

@@BackwoodsPursuit Something under 600. I playing around with different weight of field points and inserts, to kind of narrow it down.

[@BackwoodsPursuit]

@@enjoytheoutdoors101 excellent! That should do the trick! Keep me posted once you get it dialed in!

[@enjoytheoutdoors101]

@@BackwoodsPursuit Will do.👍

[@BackwoodsPursuit]

@@enjoytheoutdoors101 thanks and have fun!

[@stevenbunn5450]

You should calculate for the arrows full length , meaning all of the nock and fletchings and raps F.O.C is the full mass of the arrow because that is what the bow is pushing .

[@BackwoodsPursuit]

Thanks for pointing that out. You are correct and I realized I should have taken then measurement including the broadhead, to the tip of the nock. I may need to do an un update to this video to correct it. Thanks!

[@livingidoutdoors941]

Good stuff man.

[@BackwoodsPursuit]

Thanks for watching!

[@drewolm]

For some reason I’m watching all these FOC videos and at some point point they all take you to a online calculator. I don’t know why but that’s irritating me. Find the balance point. Measure total arrow length and divide by two. Take that measurement and mark it on your arrow. Measure distance between both points. Divide that number by total arrow length. Multiply the answer by 100.

[@BackwoodsPursuit]

Thanks for sharing and appreciate you watching.

[@davidscholten6707]

I think that footer is giving you a misleading FOC number since it’s essentially adding a lot of length to the front of the arrow that isn’t being measured.

[@BackwoodsPursuit]

Thanks for the insight! In this case, though, that footer slips over the top of the shaft and is flush with the end of the carbon, so no extra length is added to the overall arrow length. Thanks for watching!

[@davidscholten6707]

My bad. 👍 Thanks for the video dude.

[@BackwoodsPursuit]

@@davidscholten6707 no problem at all!

[@fredhammer8327]

Thank you,but why would you show how to calculate percentage on an app??surely show the mathematical equation,

[@BackwoodsPursuit]

You bet. The long hand calculation is fairly long and the app is much easier, but certainly to each their own. Some prefer the long hand and that totally fine too!

[@preyingmathis2517]

Huh..... I think you are measuring wrong. You are supposed to measure the entire arrow length with the broadhead and also to the back of the nock... The tabs on the nock have mass and do not stay behind after the shot lol Here is the correct formula. Measure entire built arrow length and then mark the exact geographic center. Then find the balance point and mark it. Then measure the distance between the balance point to the geographic center. Then take the measurement of the distance between the balance and center and divide it into the total length of arrow measurement and then multiply that by 100. I'm guessing your arrow is actually closer to 16% FOC. You can also measure the overall length with broadhead to the throat of the nock but I just don't understand why people do that because the tabs on the knock if you were to cut them off and put them on a scale do have weight and obviously mass. So in my mind they should be included in the measurements.

[@BackwoodsPursuit]

Thanks for pointing that out as the broadhead length certainly can affect the FOC as you mentioned.

[@drewolm]

No, you’re not. I will measure mine both ways but you are not to include the broadhead or point in the measurement.

[@ericbaumgartner5742]

Thats the answer not the calculation , the program did the calculation. What is the calculation

[@BackwoodsPursuit]

Hey Eric! Yes, that's correct...it's easier to just use that calculator. However if you'd like to do it manually, below is the formula: FOC % = 100 x (AL/2)/L where L is the correct arrow length, and A is the distance from the nock groove to the finished arrow balance position, including the arrow point/insert weight, nock, and fletching. I realized later that I didn't have my broadhead on the arrow when I did that in the video, but should have left it on there. Thanks!