Best Front of Center

[Legnip]

What is the best front of center for arrow flight and accurracy?

How is FOC measured? If I have a 20" arrow and the center of gravity is at 12", then is that a 10% FOC or 20% FOC?

Can you ever have too much FOC?

[GaryL]

What is the best front of center for arrow flight and accurracy?

How is FOC measured? If I have a 20" arrow and the center of gravity is at 12", then is that a 10% FOC or 20% FOC?

Can you ever have too much FOC?

If your arrow falls off the xbow, you have too much FOC

To help you out I suggest a search using FOC, lots of info., on the subject in the forum files. I will look it up this afternoon and post back at ya if it's still needed by U. I need to look it up myself now..

bstout or wabi I know can help ya out fer sure.

[sumner4991]

If your arrow falls off the xbow, you have too much FOC

Gary . . .good to see you posting!

Some folks don't think you can have too much FOC. Personally, I don't think it's something to worry about.

About any arrow/broadhead combination is going to have enough FOC without adding a bunch of weight. Mainly because of the shortness of a crossbow arrow and most of the broadheads weigh at least 100 grains.

You can get too much weight on the end of your arrow. When you get too much, then your trajectory will nose dive at longer ranges . . .that 50 yard mark on your Lumizone will not be 50.

[gendoc]

Some folks don't think you can have too much FOC. Personally, I don't think it's something to worry about.

You can get too much weight on the end of your arrow. When you get too much, then your trajectory will nose dive at longer ranges . . .that 50 yard mark on your Lumizone will not be 50.

X2....... thats how i get my FOC.... if it makes it to 50yrds like its spose too, then its all good

[ComfyBear]

GaryL...I'm so glad to see you posting on the forum. It's been so long that you have posted that I was wondering how you were doing, but I was afraid to ask fearing bad news.

If I have a 20" arrow and the center of gravity is at 12", then is that a 10% FOC or 20% FOC?

The FOC for that is 10%., much too low when using a broadhead...20% would be much better. The reason is: a larger FOC is necessary for shooting long distances where crosswinds tend to have a large effect on arrow flight. The same applies to shooting broadheads over field points because the larger surface area of a broadhead is more greatly affected by launch imperfections as well as crosswinds. Broadheads tend to steer an arrow which can often have a negative affect that the fletchings must overcome.

The formula is FOC = (B/L - 0.5) * 100

Where:
B = Balance Point, measured from the back of arrow
L = total Length of arrow, including point/broadhead

[awshucks]

Hillbilly method: measure from end of nock to end of bhead point. Divide by 2, mark that length w/ sharpie. Mark balance point. Measure between two marks, figure 5% per inch.

I'm not sure of formula on 22" arrows, but it ain't this one, lol.

[wabi]

Some folks don't think you can have too much FOC. Personally, I don't think it's something to worry about.

Couldn't agree more!

I've been shooting arrows with under 10% FOC for years and have had no problems hitting the same hole in the target shot after shot or a deer's vitals. I have NEVER missed a shot because of FOC, and I have shot in rain, wind, snow, and even good weather!

Just an opinion (guess on my part), but I think most of the desire for extreme FOC was created by arrow companies wanting to boost sales of aftermarket components.

[Pydpiper]

I am a fan of a heavy FOC.
This year I veered from my typical arrow (2" blazers/brass inserts) and went with aluminum inserts, I made a set of arrows that I was sure was going to be on my bow for the season, I was wrong.
The arrows were perfect, and they flew great, right up until I started to take long shots in a crosswind. Not only were the arrows being drifted farther than I was comfortable with, they were also penetration the target at odd angles. Hunting situation? Definitely not. But then I like to shoot a lot and experiment with everything that is available to me.
Pretty simple physics after I sat down and figured it out. Take a dart, put the weight on the back and see how well it flies, it's an extreme comparison, but at some point the more weight that sits FOC the straighter the projectile will fly.
So now I get to spend my Sunday resighting my bow back to the heavier arrows.. It's a rough life.

[awshucks]

One of Danny Miller's famous quotes when asked about FOC: "I'd shoot 100% if I could get it".

[See4miles]

FOC is a valid pricipal of good arrow flight. Rear weight your arrows and see what happens..