How much FOC is too much?

[bowmaster12]

In reading about high foc Dr. Ashby actually reduces fletching size just until the arrow slightly loses control.  Then adds what he calls a turbulator  just infront of the fletch.  This restablizes the arrow allowing for the minimum amount of fletching and weight at the back of the arrow.

[ozy clint]

old_goat2- i use 4x4" parabolic feathers.

. That's way way too much feather for high FOC, perfect for balanced foc, it's no wonder you seen the fishtailing.

they don't fishtail, they fly slightly sideways in a stiff cross wind. this effect maybe tolerated for the overstabilization they provide in hunting situations of poor release, wet feathers etc

[old_goat2]

Interesting, I never knew that some of the speed loss from EFOC, or to be more precise the higher gpp that results, could be offset by smaller feathers resulting in lower wind resistance.

first set of Efoc arrows I tuned in, point on distance stayed the same even though the arrows were significantly heavier

[Hud]

I believe Dr Ashby determined that 29% FOC was Extreme.  I am not convinced that using a high FOC is beneficial for typical game.

[flyonline]

Dr. Ashby did enough testing on FOC EFOC heavy arrows etc. to prove the point.

I thought that he "proved" that structural integrity and arrow flight were MORE important than FOC, yet somehow this doesn't seem to come up often in discussion on FOC %'s - especially by those touting high %'s 

Nock high that can't be tuned out seems to be another problem that often comes up with higher FOC %'s as well.

[old_goat2]

Dr. Ashby did enough testing on FOC EFOC heavy arrows etc. to prove the point.

I thought that he "proved" that structural integrity and arrow flight were MORE important than FOC, yet somehow this doesn't seem to come up often in discussion on FOC %'s - especially by those touting high %'s 

Nock high that can't be tuned out seems to be another problem that often comes up with higher FOC %'s as well.

I didn't have either of those problems, have seen nock high that won't tune out with normal foc arrows. Not trying to get on the you have to shoot high FOC arrows train here, but if done properly the arrows fly amazing, but it has to be done properly and you have to go the whole nine yards with it not just throw a bunch of weight on an arrow

[Wudstix]

Good to know should I need to back down in bow weight.

[McDave]

Interesting, I never knew that some of the speed loss from EFOC, or to be more precise the higher gpp that results, could be offset by smaller feathers resulting in lower wind resistance.

first set of Efoc arrows I tuned in, point on distance stayed the same even though the arrows were significantly heavier

If everything else stays the same: bow, anchor, draw length, shooting form, etc., point on must decrease when arrow weight increases.  If, for some reason, your point on is closer than usual, for example, if you are using a fixed crawl or high anchor point, you won't see as much change as you would with a 40-50 yard point on, but the point on will still change.  So what else changed?

[David Phillips]

Dr. Ashby did enough testing on FOC EFOC heavy arrows etc. to prove the point.

I thought that he "proved" that structural integrity and arrow flight were MORE important than FOC, yet somehow this doesn't seem to come up often in discussion on FOC %'s - especially by those touting high %'s 

Nock high that can't be tuned out seems to be another problem that often comes up with higher FOC %'s as well.

If you read all the work he's published you'll find he proved several things. You shouldn't need to be told arrow flight and structural integrity is important. You can shoot an arrow with high or extremely high FOC that wobbles and hits sideways if you want to, or you can take the time to do it right. You can also shoot wood and only wood and disbelieve the FOC EFOC flight and penetration advantages but it doesn't change the results.

[Friend]

Have found no issues with Ultra EFoc shafts.

Have shot complete 3D rounds with a Ultra EFOC bare shaft and have recorded an 8.0 average per target. The pressure on the feathers is greatly increased when in the upper thresholds of FOC.

One simple test is to shoot an arrow with 4" feathers at 40 yards and then should another arrow of the same identical specs with the exception of utilizing 5" feathers. There will be a noticeable drop at impact.

[Wudstix]

All good info.  I'm not real familiar with carbons, having ever hunted or shot 3-D with them.  Plenty of room to experiment it seems.