goldtip45

i was asked this question about foc.is heavier better than light or is in the middle just right as far as flight and penetration.i just told them anywere in between 8 to 10 was fine.is one better than the other for better grouping etc?

PABowhntr

I believe that the generally accepted number for exposed blade broadheads is at least 10%. 8% might still work well for field points but you will probably experience an increase in group size if you were to try it with an exposed blade broadhead. 10-12% is usually the suggested range. Heavier is normally better than lighter....within reason.

JeffB

Well said. I prefer a pretty heavy FOC...11-14%.

Jason N

I seem to get best flight, trajectory and stability when shooting about 12%.

goldtip45

great mine is about 11.75%

Bigpapascout

most people cant even get near 8% on a arrow tith a broadhead because no manufacturer has made them light enough to get less than 10% on the front.

how well a broadhead flies does not depend on how heavy it is, it depends on if the arrow will stabelize the the planeing effect of the broad head.

I shoot arrows that have 9% foc with a fixed blade head and guarantee that they fly bettere than any heavy head I have ever used.

Jason N

Just for the fun of it I went to Jackson's and did a little playing around.....

Beman ICS 340 @ 28" with 3 4" vanes and other wise standard ICS components with an 85gr head comes in at 404gr and an 8.1% FOC. Same thing with 400 shaft but the FOC pumps to 8.7%

I think that is a fair representation of a somewhat typical setup....exception being the head weight. Add longer vanes and/or wraps or dipped shafts and that back end gets aweful heavy in a hurry.....of course, most guys seem to be shooting 100gr or 125gr heads. Just some food for thought.

Arthur P

With all due respect, that's a bunch of hooey. You have to make informed choices on how you make up and arrow and what weight broadhead you choose or you can get in big trouble when it comes to tuning and sighting in.

A 28" 2216 with 5" vanes and a 75 gn head will be around 6.3%. A Beman ICSH 340 with a 75 gn head and 4" vanes - not an unusual arrow at all - FOC's at a mere 7.2%

In both cases, going to 100 gn heads and 4" feathers puts FOC over 11%, making for much more stable and better hunting arrows.

Bigpapascout

are you determining FOC% by components or are you physically getting the balance point of the arrow and the center of the cut length?

Howler

Since we're talking FOC, would someone double check my math for me as the way I have it figured, I have about 15.8% FOC. My arrows are 28.5" long, 5575 which weigh 8.2 gr/in., with 100 gr. tip and 3 4" vanes, which I beleive weigh between 388 and 390 grains total. So the center of the arrow is at 14.25 and the balance point is at 12". So is my number of 15.8% correct. And also, if I were to shorten my arrows 2", which I can now with the drop away rest and still have enough arrow out front, would that stiffen the spine so that I could go up to a 125 gr. tip. In other words, I'd loose 16.4 gr. of arrow but gain a total of about 9 gr. of total arrow weight. But, what would that do to my FOC?
Also, my draw is 28" on my MQ1 and I have it set at 70# pull with 80% let off!
Any help would be appreciated?