How much is too much EFOC?

[Crystalshrimp]

#5221

I’m currently shooting 52# @ 27″
Arrow setup is a Trad. only Shaft cut to 29″ with a 100gr. insert and a 150 Bh. Or a GT 3555 with the same setup. This comes out to about 21% or so EFOC. These Arrows are right on the money for me.

I’d like to change my set up to a the next heavier spine being a Trad only 400 or a GT 5575.
With a 260gr Single bevel BH. Is This overKill or can it be accomplished if I start out with a full length arrow and just work my way down till i get good bare shaft flight. What are you guys shooting and what is you FOC or EFOC.

Is 260 grains just too much to put up front? Should I stick with the 500 spined arrow and 260 grains up front. Or Would I benefit from placing 260 grains in front of a 400 spined shaft. What would you do?

[Homer]

#38542

Crystalshrimp — I’m no expert but I do read most everything here and in the magazine about FOC, and have worked up arrows to 25% using carbon shafts, but can’t yet hit 20% with wood. Seems the standard advice before going to stiffer shafts is to incrementally add point weight and see how far you can get that way without losing perfect flight. If you have 2″ of shaft out front right now, you have room to cut back around an inch, which could allow more weight up front without overspining. But then, shorter shafts are harder to get EFOC with. I don’t know about you, but if you have perfect flight and 21% FOC I think I’d be content right there, unless the overall arrow weight is light and you’re looking to chase moose or elk or such. I’ve found no way to determine these things without expending some shafts in experimentation. You might get more and better answers to this if posted in the Ashby forum, not sure. H

[Crystalshrimp]

#38734

Homer wrote: Crystalshrimp — I’m no expert but I do read . You might get more and better answers to this if posted in the Ashby forum, not sure. H

Yes I should be content. The arrows im shooting are 8grns per inch and I’m not sure if i can drop the heavy insert and add another 10 grains without affecting flight. I’m really set on using those Abowyer BH’s. They are similar in shape to the Ashby’s. I’m just concerned with the hardness. I read that Ashbys BH’s (prototypes) chipped because of hardness issues. He’s since had the issue corrected. I kinda got off track. ……..ill start again tomorrow

[David Petersen]

#39270

“He’s since had the issue corrected.”

Just a reminder that Dr. Ashby has zero financial or other interests in the ABS Ashby broadhead, which is owned and marketed entirely by ABS. Brief history is that having done all they could to provide a head that meets all of Ashby’s recommendations coming from his many years of testing, ABS asked his permission to use his name on the head, by way of honoring him. Wanting to reward their efforts, he unfortunatgely agreed. It has since caused much confusion and is used by his critics to claim falsely that he’s in it for personal profit. Precisely the opposite: all these years Ed has conducted his studies at his own considerable expense, from love for the sport and a desire to reduce wounding loss. The Abowyer Brown Bear is an excellent head and even with the recent price increase is far cheaper than the Ashby. And the hardness is about right for my tastes. I am, at this point, banking on the forthcoming Werewolf from Eclipse, which will come in a variety of weights and promises to be the first affordable single-bevel that comes hunting sharp in the box. Thanks to Ashby and manufacturers who are paying attention, we now have a rich wealth of excellent heads to choose from. dp

[Ed Ashby]

#20556

To the original question, there appears to be no upper limit to the beneficial effects of EFOC on both arrow flight and terminal arrow performance. I’ve used EFOC into the low 30% range, and now consider 30+% FOC my goal when building new hunting arrows. The PNG natives use unfletched arrows having FOC’s from the high 30% range to the mid-40% range. that’s how they get good arrow flight without fletching, and they consider 25 yards good shooting range.

Ed

[Stephen Graf]

#27951

Different bows like different arrows too. I got all gummed up for a while when I switched from a reflex/deflex to a straight long bow.

The reflex/deflex was much easier to tune with a variety of points from 150 to 350 grains. But the straight long bow was not so accommodating.

It’s only a 55lb bow. But with GoldTip 75-95 arrows, I could only get 250 grains up front before she started bucking. I should mention that I like to shoot full length arrows.

Even though the 75-95 arrows bare shafted perfectly with 250 grain points. I ended up using 55-75 arrows with 200 grain points because once feathers were introduced, the lighter arrows just seemed to group better.

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