ok i have a arrow that is 31 5/16 inches long with a broadhead attached. i am trying to find out my foc by using the site http://home.att.net/~sajackson/archery9.html i dont not understand how to find out the balance point of my arrow?? somebody please help me here.

thanks,
Shootem

To find the balance point, I just use a pencil and balance the arrow. Then mark it.

so does a foc of 6.1% sound right to you? the balance point is 17 1/2 inches from the nock tip. my center of the arrow is 15 21/32 so i made it 15 5/8 which would give me a distance of 1 15/16 inches from the balance point to center of arrow. is this right or have i done something wrong

It's difficult to say without knowing what kind of arrow, arrow tip weight, nock system, number of fletchings, material of fletchings, and size of fletchings. Also remember that when you measure the arrow, it is from the inside groove of the nock.

well i measured from the tip of the nock so if i do it right will it make my foc better or worse?

ok let me explain this one more time.

ballance the arrow on a nail with the point installed, mark the ballancing point.

measure the arrow from the throat of the nock to the insert, this is the cut length of the arrow.

divide the cut length by 2, this will give you the center of the cut lengrh of the arrow.

mark the center and measure from the center mark to the mark of the balancing point.

multiply this measurement by 100.

then divide this number by the cut length of the arrow, this is your foc%

it is best to convert fractions to decimals.
in example, if you have a fraction of 1/4" simply divide 1 divided by4 this will give you the decimal equivelant.

i thought u were supposed to include the broadhead into the length of the arrow. going to have to start over.

How to determine the FOC manually. Take one of your arrows, fully equipped including tip, that you will be using. First you must find the balance point on the arrow's shaft. To do this try to balance the arrow on a sharp edge. Once you have successfully balanced the arrow, place some sort of mark at that spot on the arrow's shaft. Next, measure (inches) from the bottom of the nock grove to the balance point. Then measure (inches) the length of the arrow from the nock grove to the edge of the arrow shaft, not the insert (This is called the arrows cut length.) Divide the arrow length by two, this will give you the physical center of the shaft. Now subtract the physical center number from the balance point value and divide by the arrow length value. Multiple this number by 100 to get a percentage (%).

A FOC value range of 7-10 percent is widely used as the best for a good balance between arrow range and arrow flight stability. If your calculated FOC doesn't fall with this range, don't fret. You can still have good arrow flight with an FOC as high as 18 percent, but your range will not be as good. Try not to go below 7 percent.

Example FOC Calculation

Balance Point Length 17.25"
Arrow Length 28"
Arrow Length / 2 14"
Balance Point Length - (Arrow Length / 2) 17.25 - 14 = 3.25
3.25 divided by Arrow Length 3.25 / 28 = 11.6%

NW Outdoor shop

Never mind

Just check out the arrow building information at www.huntersfriend.com
it's free and has some very helpful info.