FOC Who has actually measured and calculated?

[jakelogsdon]

My current arrow is cut to 29". 300 spine, Day 6 arrow (11.2 gr per inch), 100gr point and 75gr insert, bohning heat vanes 4 fletched with a 7" wrap cut in half. I measured my FOC to be at 9.5%. This arrow flies amazing and very consistent at long ranges. I'm just wondering what you guys are at, and if there are noticeable differences, that would make it worthwhile to make some changes.

 

[StopMakingSense]

I push for 11-13% when doing an arrow build. Is this with field points or broadheads? Do you consider long?

What's your draw length, and draw weight and IBO?

 

[Billy Goat]

I generally run 12-15% on a hunting arrow in compound. I do it by running a light shaft, 3 fletch, and no wrap.

Recurve I'm around 20+ foc.

Not from programs. I actually balance and measure mine. But I don't include the point in the measurements.

Also my indoor arrows I have gone heavy foc. Like 20%. Seems to help my shooting. Also a weaker spine seems more forgiving with a field point. Different story with a broadhead. I go overspined for broadheads.

 

[jakelogsdon]

I push for 11-13% when doing an arrow build. Is this with field points or broadheads? Do you consider long?

What's your draw length, and draw weight and IBO?

100gr field points.
80 yards is what I shoot at mostly in my "backyard range". I can consistently shoot 3" groups with this arrow
Total arrow weight 502gr
30" DL
Actual draw weight 72#
287 FPS measured

 

[Kilboars]

I'm about 13% with BE Rampages at 29'' 125g tip and a Luminok

 

[Billy Goat]

As your draw length is longer, it will be hard for you to get a higher foc.

It's hard to balance spine and heavy foc on a longer draw.

 

[Mighty Mouse]

My current arrow is cut to 29". 300 spine, Day 6 arrow (11.2 gr per inch), 100gr point and 75gr insert, bohning heat vanes 4 fletched with a 7" wrap cut in half.

Total arrow weight 502gr

Your component weights seem off: 29" × 11.2 gpi + 100 gr point + 75 gr insert = 499.8 gr, which only leaves 2.2 gr for your vanes + wrap + nock with a 502 gr TAW. Are you sure the insert weighs 75 gr?

 

[jakelogsdon]

Your component weights seem off: 29" × 11.2 gpi + 100 gr point + 75 gr insert = 499.8 gr, which only leaves 2.2 gr for your vanes + wrap + nock with a 502 gr TAW. Are you sure the insert weighs 75 gr?

The insert has to be 50gr then. Ive actually weighed the total arrow to be 502gr, And I dont have any loose components left to weigh for these arrows. but looking on day 6's web site they have 50 gr and 100 gr components sets.

 

[Mighty Mouse]

The insert has to be 50gr then.

That makes sense.

To answer your original question, I shoot for an approximate total weight when building arrows and let FOC fall where it may. But I like heavy arrows and most of the weight adders go on the front, so my FOC ends up being pretty high. My current hunting arrows are 630 gr with 20% FOC:
GrizzlyStik Momentum 240 at 27.25" C2C = 317 gr
Cutthroat broadhead = 150 gr
In/outsert = 70 gr
Stackable brass weight = 50 gr
Firenock = 25 gr
Three 2" Blazer vanes = 18 gr

I may ditch the brass weight this year to shave 50 gr and flatten out my trajectory a bit, which would reduce FOC to around 16-17%.

 

[StopMakingSense]

Shoot some broadheads then with that setup, if it's still shooting good why change it. Even if you add point weight you're going to weaken the arrow and it sounds like your dynamic spine coming out of the bow is great if it's flying that well at 80 yards.

I'm not a huge FOC guy, I just aim to be 11-13% as a good rule of thumb when I build is all. I get the best flight for shooting my broadheads when I'm in that bucket. Anything over I'm not noticing any difference. I shoot fixed blade cut on contact so past 70ish I'll start to notice a dip down to the right due to the inherent drag of a broadhead.

 

[jakelogsdon]

Shoot some broadheads then with that setup, if it's still shooting good why change it. Even if you add point weight you're going to weaken the arrow and it sounds like your dynamic spine coming out of the bow is great if it's flying that well at 80 yards.

Id like to be able to shoot to 100, but with my current setup My fletchings will make contact with my scope housing if I dial my sight down that far. Id also like to build an arrow with a 13-15% FOC. I'm definitely happy with the performance of this current arrow setup I've built, including broadhead flight, but I'm always messing around with stuff anyway.

 

[dkime]

Id like to be able to shoot to 100, but with my current setup My fletchings will make contact with my scope housing if I dial my sight down that far. Id also like to build an arrow with a 13-15% FOC. I'm definitely happy with the performance of this current arrow setup I've built, including broadhead flight, but I'm always messing around with stuff anyway.

Why 13-15%? If your broadheads are flying well and you’re constantly shooting 3” groups at 80yds then I’m not sure what you would gain. The greatest outdoor archers in World archery have a 3.14” X ring at various distances similar to what you listed and shoot FOC % similar to what you’re after.


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[jakelogsdon]

Why 13-15%? If your broadheads are flying well and you’re constantly shooting 3” groups at 80yds then I’m not sure what you would gain. The greatest outdoor archers in World archery have a 3.14” X ring at various distances similar to what you listed and shoot FOC % similar to what you’re after.


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Curiosity I guess. When I started thinking about trying to build a little lighter/faster arrow, I also started thinking about other things I would like to do while I'm at it, increased FOC was one of the variables I haven't messed with much.

 

[5MilesBack]

I've shot arrows at 9% FOC, but most of mine fall somewhere around 11-12.5%. I don't worry about it at all, as all those arrows have shot well. I do have some that measure at 16% but I can't even use all 7 pins in my sight with those arrows......too heavy at 632gr.

 

[Billy Goat]

If you want to play with heavy foc your either going to need to go way heavy arrow or find a shaft around 9gpi.

Many of the long draw shooters don't put much faith in heavy foc. It's difficult to get with longer shafts. I can't be certain how helpful it is at this point. I do know Easton has probably spent more money trying to figure it out than I have. They have their recommendations, and it's not anything extreme.

 

[jakelogsdon]

The arrow I'm probably going to build next is a Victory VAP SS. They will release in April. specs show 9.9 gpi on a 300 spine. They have a SS/AL 75gr insert I'm going to try. I think that will help out

 

[Billy Goat]

The arrow I'm probably going to build next is a Victory VAP SS. They will release in April. specs show 9.9 gpi on a 300 spine. They have a SS/AL 75gr insert I'm going to try. I think that will help out

Being 1.3 gpi lighter that gives you about 35 grains extra to play with. Meaning that's either a lighter arrow or more foc. Of course you are thinking you currently have a 50 grain insert. So that will take 25 of the 35 if you use the 75 g insert. But it will allow you to move more weight out front while maintaining similar weight/speed you currently have.

 

[jakelogsdon]

I didnt put the math to it, but I kind of had it in my head that i was going to be in the high 480s in TAW. with a stronger FOC also

 

[doncarpenter]

Easton hexx 260 is 9.3 gpi, come standard with 75 grain brass and with the stiffer spine you could run more tip weight if all you want to do is hit a FOC percentage.

I don't put much stock in heavy FOC. It just has not proven much different than 11-12% that my arrows usually end up at.

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[nphunter]

I built some arrows last year and ended up at 16% FOC and 500gr, they don't fly any better or worse than my last arrows that were 390gr with 9% FOC. They hit harder but also are 25% heavier, my next arrow will most likely be back down around 11% FOC so I can go with a more durable arrow and still end up right around 500gr.

Both arrows killed elk equally well.