too much FOC?

[nightowl1]

Is there a point where you get too much foc?
Keeping the same relative GPP?

Background: Getting 45# limbs at 27"
27.5" GT 15/35 250 up front= 470g 26% FOC
(haven't made them just calculated spine, but should be close)

Can you go to far?

[R H Clark]

Just my opinion but I think high FOC is fine untill you start getting an arrow so heavy that it drops too much at longer distance.If I miss judge how far the shot is I want a faster arrow so that I will miss by fewer inches.I don't like arrows much over 10 gpp.If I need to shoot a heavier arrow I'll shoot a heavier bow.

[nightowl1]

the arrow i described would be just about 10.5 gpp. I understand arrow weight but with the same gpp can you get too much foc?

[Whip]

I'm no expert, and not speaking from personal experience, but rather from what I have read.  It would be hard to have too much FOC given that that arrows are properly spined.  But it WILL definately affect arrow spine and tuning, and that is where it is important.  

Are your new limbs lighter or heavier than the ones you currently are using those arrows with?  Assuming that they are properly spined and tuned to your current set up, you might need to add or subtract weight from the front to tune them to the new limbs.  If they are significantly different in weight, it might require a new arrow altogether.

I'm not sure what you mean by GT 15/35?  I'm not familiar with that shaft designation.

[R H Clark]

I think you have a great FOC and arrow weight as long as the tune is good as Whip mentioned.My statement was more general than specific.

[Dartwick]

From an aerodynamics and a penetration perspective you cant have too much. More is always a little better.

But of course there is practical limits. Youll be hard pressed to tune a arrow with a shaft so light its a wet noodle with 500 grains in front of it I would think.

[nightowl1]

I have been shooting a 58# bow. I don't have these arrows, i have been shooting 250s. I'm moving to this weight to improve form and just because i think it will work just as well and be more fun to shoot.

Gold tip traditional 15/35 they just came out with them and i was doing some calculating with that new download that was out. I figure that would get me close and a few cuts here and there and i could get them perfect. With the spine calculator these are within .4 pounds.

The 47# limbs im getting are from a proven bowyer with a good fast bow. So I want to take the most advantage i can from it.

[xtrema312]

I have noticed, I think, an issue where as my FOC gets over about 23-24 I can't get a shaft to shift to bare shaft weaker or at least come back right as much as it did with the lighter point changes.  It is like the point overpowers the shaft.  I am shooting 100 gr. inserts and 3R test point set. I am ok from about 200-275 with point changes making the arrow move, but as I go higher it just stays in about the same place as they did at 275.  It could be my imagination as I have not been shooting these higher FOC arrows that long.  Even if it is doing this I don’t know that it is a problem.

[JC]

I think there is a balance between weight and too much weight...I'm not sure who but someone more knowledgeable than I determined there was a point of diminishing returns for penetration past 14gpp or so.

That said, I'm not sure you could get too much FOC and I certainly don't think 26% is too much. The problem is finding a shaft that is light enough and still stiff enough to hang more weight off the end. So the delicate balance is: as high an foc as possible, while getting a shaft as stiff as possible to make all that point weight fly well out of your bow while at the same time keeping total arrow weight within your desired range.

I've found some compromise must be made in my arrows for my bows (though it looks like you have very little compromise in your setup). I'm shooting between 10-12gpp depending on draw weight which to maintain the "balance" of the variables leaves me with FOC usually between 19-22%. If I could get 26% by golly I'd use it in my setups if I was in the target gpp I wanted.

No matter what you end up doing, I'm sure you know the key is to get arrow flight as perfect as possible. All that FOC is wasted if it's trying to fight against poor flight to get penetration.

Good luck in your search.


P.S. - Whoops, looks like everyone else said what I wanted too while I was typing    :D

[MikeBurns]

My bow is 46# @ 26" and my arrow length is 27.5". I'm using 250 grains up front on 35/55 GT's. I'm getting perfect arrow flight. I'm thinking with the same weight on the 15/35's you might be a little weak.

[Rob DiStefano]

imo, it's all about finding the right stiffness carbon shaft that's light enuf to allow lotsa gpp and foc front end package variations that'll allow for either more speed or more penetration ... or both.  there are other variables besides the arrow, such as the archer and the bow(s), but it all starts and ends with our most important piece of gear - the arrow.