FOC
Moderator: Excalibur Marketing Dude
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FOC
Anyone think an foc of 20% is too much for a micro out to fifty yards? Another question, if two arrows weigh the same but one has an FOC of 20% and one with an FOC of 14% would the 20% arrow drop off faster even though they weigh the same?
Axe 340
308 SHORT
ZEISS XB 75
308 SHORT
ZEISS XB 75
Re: FOC
With that said coming from Sew! You can take it to the bank.. Hes got that broad head down............
Matrix, 355. Hawke Xb-30 Pro. Ibex, Nikon Bolt. Strings By Boo, Nchunter, Zombies & Spynal Tapps From South Shore Archery,Now Built By My Son, N.A.P. Spitfire XXX and Magnus Black Hornets. (Fight Hard..Love Fast.. Die Young..)
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Re: FOC
SEW, I hunt with rage bh's. How much extra drop we talking with 20% up to 50 yards, minor or a lot? Does anyone know the FOC of a stock quill?
Axe 340
308 SHORT
ZEISS XB 75
308 SHORT
ZEISS XB 75
Re: FOC
Can't help on your questions, but I've come to classify FOC in three steps.
Under 10% is low, 10-15% is medium and all above 15% is high. FOC will help a weakly built arrow shoot better, in most cases.........
I think i'm at or around 18% last I checked, fwiw.......
Listen to SEW...........
Under 10% is low, 10-15% is medium and all above 15% is high. FOC will help a weakly built arrow shoot better, in most cases.........
I think i'm at or around 18% last I checked, fwiw.......
Listen to SEW...........
"Eze 18:21"
Re: FOC
I shoot slow (Vix II - 272 @ the muzzle),
I shoot heavy for that bow (almost 400 grains - 325 minimum),
I use 4" vanes,
I shoot 100 grain mechanicals (currently Axe, Battle Axe's), and
I shoot "extreme" FOC > 22% (210 grains - broadhead/insert, is at the "business end").
While working up my set-up I noted a 5-6" "drop" at 25 yards between a 14% and 22% FOC, all else being equal (within 10 grains) at that speed.
More speed will result in less drop, all else being equal.
I have ruined many arrows putting them on top of each other on the target.
I shoot that FOC because after more than 2000 shots using off the shelf and self-built bolt that's where I got the tightest, most consistent groups that were least effected by varying winds out to 35 yards.
It works for me, others experience may be different.
I shoot heavy for that bow (almost 400 grains - 325 minimum),
I use 4" vanes,
I shoot 100 grain mechanicals (currently Axe, Battle Axe's), and
I shoot "extreme" FOC > 22% (210 grains - broadhead/insert, is at the "business end").
While working up my set-up I noted a 5-6" "drop" at 25 yards between a 14% and 22% FOC, all else being equal (within 10 grains) at that speed.
More speed will result in less drop, all else being equal.
I have ruined many arrows putting them on top of each other on the target.
I shoot that FOC because after more than 2000 shots using off the shelf and self-built bolt that's where I got the tightest, most consistent groups that were least effected by varying winds out to 35 yards.
It works for me, others experience may be different.
Graham
Micro 340TD, 17" Gold Tip Ballistics (180 gr inserts) - 125 gr Iron Will/VPA/TOTA (504 grains total/21.6% FOC) @ 301 FPS
Micro 340TD, 17" Gold Tip Ballistics (180 gr inserts) - 125 gr Iron Will/VPA/TOTA (504 grains total/21.6% FOC) @ 301 FPS
Re: FOC
To help answer some:
The shorter the arrow, the more Foc needed.
The more drag(serious helical) at the nock end of the arrow, the more FOC needed.
20% FOC for a 16" arrow may well be needed for most situations.
Since expandibles are virtually the only style I shoot, I can get by with somewhat less FOC than some others use.
Out to 50 yds, I don't think (but don't know for sure) that more FOC would be seriously detrimental trajectory-wise. From 50-100 yds, it really makes a difference.
I do all arrow testing for groups in very low wind at 80 yds. I shoot to 100 yds.
For most Expandibles , I've found 4 degree offset to be more accurate than helical . Not so with fixed broad heads - the reverse is true.
Hope some of this helps.
The shorter the arrow, the more Foc needed.
The more drag(serious helical) at the nock end of the arrow, the more FOC needed.
20% FOC for a 16" arrow may well be needed for most situations.
Since expandibles are virtually the only style I shoot, I can get by with somewhat less FOC than some others use.
Out to 50 yds, I don't think (but don't know for sure) that more FOC would be seriously detrimental trajectory-wise. From 50-100 yds, it really makes a difference.
I do all arrow testing for groups in very low wind at 80 yds. I shoot to 100 yds.
For most Expandibles , I've found 4 degree offset to be more accurate than helical . Not so with fixed broad heads - the reverse is true.
Hope some of this helps.
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- Posts: 138
- Joined: Sat Jul 07, 2012 5:19 pm
- Location: NC
Re: FOC
What Im considering is 16 BE executioners off set blazers aluminum nock and a 92gr insert with a 100 grain rage. ( arrow weight 374 50 with an foc of 20 45% ) if my calculations are right. This is the same set up I use with my 380 except for the length was 20". It work great out of the 380 but going to 16" I was wondering if I should do something different for the micro because I don't want more drop than necessary since Im going down from a 380 to a 335 bow. Im not a speed freak just looking for the right combo before I spend money.
Axe 340
308 SHORT
ZEISS XB 75
308 SHORT
ZEISS XB 75
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- Joined: Sat Jul 07, 2012 5:19 pm
- Location: NC
- Limbs and Sticks
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Re: FOC
All ready been said, knowing how to build a arrow correctly is 75% of it to me, I shoot between 10 and 15% foc with 20 series alum arrows and have no problems with most bh's
Wes
Wes
"Maxine"
1.75x5 Burris scope
Boo string
STS
Feathered easton 2020's
Magnus stingers
1.75x5 Burris scope
Boo string
STS
Feathered easton 2020's
Magnus stingers