First of all... let me ask forgiveness. I did do several searches and read until my eyes began to shrink.    

Could some kind soul please point me to the link that explains FOC calculation?

I want to experiment with this in hopes of increasing penetration on larger game (elk).

Thanks...
Wayne

http://www.archery-engineering.co.za/conversions/arrowweightandfoccalculator.htm

Thanks!

Is there a way to figure it on woodies? I'm simple minded also so keep in mind the simpler the explanation the better.  

Look in the "How To" forum section.

Thanks Mark. I will look.

(ABP/TAL) - .50 x 100 = FOC%

Arrow balance Point (measured from the throat of the nock) divided by Total Arrow Length (measured from the throat of the nock to the back of point) minus .50 times 100 equals Front Of Center %.

An example would be as follows:
 ABP 18.25 / TAL 29 = .6293 - .50 = .1293 x 100 = 12.93% FOC

Here's a link to an Excel file I built that'll give ya FOC and GPP ...

Excel .xls file

Enterprise Excel .xlsx file

   

Good deal. Thanks Rob.

Thanks Jack, Mark, Rob. The first calculator provided didn't have enough options for my set up.

So, what is an "acceptable" amount of FOC for elk sized animals ???

Winterhawk1960

Here's a FOC calculator online.

http://home.att.net/~sajackson/archery9.html

QuoteOriginally posted by mickeys4:
Here's a FOC calculator online.

 http://home.att.net/~sajackson/archery9.html  

thats the one I use. nice n simple  :D

Don,

I'm shooting Traditional Only carbons from 3 rivers... with a 100 grain insert and 100 grains of weedeater string and 125 grain woodsman BH.

It appears that I've got a total arrow weight of about 585 grains. I would like to reach 600. Nothing "magic" about 600, just a nice round number and recommended by some as a minimum for elk. I'm considering increasing my BH weight to 145 or 160 grains.

I'm curious where my FOC will end up... but not aiming for a particular number.

Wayne

imo, one should think about mass arrow weight, first.  i think the minimum for that would be about 9gpp (that is, 9 grains of arrow per pound of bow holding draw weight).  that plus a well flying, well placed sharp arrow and yer good to go.

foc is all about arrow balance.  there are theorized, and at best subjective claims of added penetration and enhancements to arrow flight.  use it or not, i don't think it's as important as ....  
 
use as heavy a holding weight bow as you can master, have well flying arrows, sharp c-o-c broadheads, and consistent arrow placement.  see, trad bowhunting isn't all that hard.    :D