Trad Gang
Main Boards => PowWow => Topic started by: Bob B. on May 26, 2009, 10:49:00 AM
-
I am looking for assistance with calculating FOC of an arrow. I know this has been done before, but I can not find the older threads. If you can help, I appreciate it.
Bob.
-
In the meantime check out Jackson's FOC calculator.
-
What Bjorn said.
-
http://home.att.net/~sajackson/archery9.html
-
OK, I got two ways, the same thing but different:
A) Distance knock throat to balance point divided by shaft length ( arrow only ) minus .5 X 100 = % FOC {taken from an older Ashby document}
B) Find balance point from knock throat to point of balance. Find shaft total length. Divide shaft length by 2 and subtract from balance point. That is your FOC length. Divide FOC length by shaft length and multipy by 100, that is % FOC.
Anyway, it is simple to calculate and makes me feel prety good about my set up, about 480 grain arrow, from about 48 pound bow with 20 % FOC and single bevel broad heads. If I can hit what I aim at, I will be ready Wisconsin's white-tails. :archer:
Bob.