grain per pound
03-01-2008, 12:56 PM
#12
Join Date: Sep 2005
Location:
Posts: 265
RE: grain per pound
You can find online calculators to tell you (gold tip has one on their website).
I prefer to find it myself. Measure your arrow from the tip of the field point to the back of the nock (some people disagree on where to measure to and from, but this is how I choose to do it). This is your total arrow length. Divide that by 2. That is the distance to the midpoint of your arrow.
Then, balance your arrow. Measure from the tip of the field point to the balance point you found. Take that measurement and subtract it from your arrow midpoint.
Take your final value, and divide it by your total arrow length, then multiply it by 100. This is your real life FOC.
Total arrow length = X
Total arrow length/2 = Y
Midpoint - distance from tip of nock to balance point = Z
your equation would be:
[ (Y - Z) / X ] x 100 = FOC %
Hope this helps.
I prefer to find it myself. Measure your arrow from the tip of the field point to the back of the nock (some people disagree on where to measure to and from, but this is how I choose to do it). This is your total arrow length. Divide that by 2. That is the distance to the midpoint of your arrow.
Then, balance your arrow. Measure from the tip of the field point to the balance point you found. Take that measurement and subtract it from your arrow midpoint.
Take your final value, and divide it by your total arrow length, then multiply it by 100. This is your real life FOC.
Total arrow length = X
Total arrow length/2 = Y
Midpoint - distance from tip of nock to balance point = Z
your equation would be:
[ (Y - Z) / X ] x 100 = FOC %
Hope this helps.
