Yes, please let us know where you found that. Also Jesse, I have wondered something about FOC and efficiency of delivering the energy to the intended target. Your arrow setup is at 25%. My arrow comes in at 515gr at 303fps but only ~9% FOC. I have a friend who has a higher FOC, ~20%, and is shooting in the 290s, his arrow is ~475 gr. From 70 his arrow penetrates a foam target around 6" and mine is blowing through them. We setup and tuned our bows to the same spec. My question is this: if my arrow flight, accuracy and penetration are all superb what reason would I have in going up in FOC? My current reason for not going up is the increase in pin separation caused by heavier tip weight, thusly the decrease in accuracy at extended ranges. I am looking for solid information and have a ton of lingering questions . Sent from my iPhone using Tapatalk
A higher FOC doesn't have any bearing on penetration. You are getting better penetration because you have a heavier arrow traveling at a higher velocity than your friend. Increasing the FOC will help make the arrow more stable during flight. An arrow with a high FOC will have more arc to the trajectory at longer range and "nose dive." A lighter FOC will have a flatter trajectory but may fly erratically. If your flight and trajectory are superb, you don't have to increase your FOC. Mathematically, a 10-15% FOC is ideal and a lot of setup fall in that range.
So if I am in the area of 8% I shouldn't mess with it? I kind of disagree that FOC has no bearing on penetration. I do agree if the mass, vel, flight path and entry angle are equal then FOC has no bearing on penetration. But say that the masses, and vel are equal but the path/entry angle are not, the higher FOC will tend to penetrate more due to the shorter "lever" acting on the mass. All that jibberish being said, is there any reason to have concern over an 8% setup if the penetration is more than acceptable? My only concern is hitting a rib or the shoulder, the intent with the heavier arrow is to blow through the first layer of bone the arrow comes into contact with. Mind you this is a worst case scenario. Sent from my iPhone using Tapatalk
I think I'm tracking what you mean on the weight of the arrow acting as a lever. Say, hypothetically, a nock weighed 100 grains and the broadhead weighed 12 grains. On impact, the weight at the nock would not tend to follow the path of the arrow, whereas, a heavy point of impact would tend to pull the arrow in the same path? Either way, if you don't want to mess with your setup because you're getting the performance you want, I don't blame you, especially this close to the season. It could be as simple as going from 100 to 125 grain tips and sighting in again.
Justin, I thought BHOD was doing a FOC and penetration test, did anything come about of that? Sent from my iPhone using Bowhunting.com Forums
It stands for Front of Center. Essentially it's the point at which your arrow balances from front to back. Since your point is heavier than the tail of your arrow that point is closer to the front than the back. The heavier the front end of your arrow the greater Front of Center % you will have. So saying an arrow has a 10% FOC means it balances at 10% in front of the center point of the arrow. A common belief is that arrows with a higher FOC value penetrate better. Which may simply be a benefit of having a heavier arrow with more momentum. In order to increase FOC value most people add weight to the front of the arrow in the form of either a brass insert, brass weight or heavier point. While those all increase FOC they also increase total arrow weight which is most likely benefiting penetration more than the FOC increase. People that shoot super long distance outdoor archery (50-100m) find that their arrows fly better with super high FOC and a lot of weight up front. However at bowhunting distances it's not nearly as critical.
This is a bought program not a website, furthermore your benefit of switching to a higher FOC set up will cause the arrow to penetrate better in the instance of hitting a bone or something hard because FOC will pull the arrow through the target, if you switched to a helix broadheads you would get even more penetration! Sent from my iPhone using Bowhunting.com Forums
This is a bought program not a website, furthermore your benefit of switching to a higher FOC set up will cause the arrow to penetrate better in the instance of hitting a bone or something hard because FOC will pull the arrow through the target, if you switched to a helix broadheads you would get even more penetration! Sent from my iPhone using Bowhunting.com Forums
Also increased tip weight does not cause you to be less accurate with this set up I still shoot 100 yards and can hit plates at 100 Sent from my iPhone using Bowhunting.com Forums
Front of Center. It is the arrows center of mass and how far "front of center" the center of mass is. Sent from my iPhone using Tapatalk
Put it this way with a high FOC set up at 500 grains I would go through both shoulders and hit dirt 80% if the time maybe even more with low FOC and 500 grains I'm only going to hit dirt maybe 30-40% of the time if that Sent from my iPhone using Bowhunting.com Forums
Well then you're not comparing apples to apples. Arrow diameter and broadhead size/type will probably play more of a role in penetration than FOC will - assuming arrow weight is close to the same.
No offense but I don't believe there's any factual evidence to back this type of claim up. Certainly not when it comes to arrow penetration and deer shoulders. There's a million different factors that play into how well that arrow is going to penetrate - arrow weight and more specifically FOC is only one of them.
Exactly what I'm talking about. If the arrow flight path is ideal, meaning the nock DIRECTLY follows the point, then FOC has no bearing on penetration. But because we know this case doesn't exist, the only way to combat this is FOC adjustment, and of course arrow path. I would say my flight path is dialed in as good as I can get it and the whole point of FOC is path and thusly penetration. I just think if I change my FOC it will have a negative impact of: 1)pin spacing 2) flight path (until retuned) 2 things I don't want to mess with this close to the season. Sent from my iPhone using Tapatalk
