Excalibur Crossbow Forum

Limbs and Sticks · Post by **Limbs and Sticks** » Wed Apr 08, 2009 4:24 pm

http://www.lmariana.com/foc.htm

Here is the link to figure your foc plain jane

Wes

wildwindom · Post by **wildwindom** » Wed Apr 08, 2009 4:26 pm

Then if i did it right mine said 8.725 is that good or bad??

crazyfarmer · Post by **crazyfarmer** » Wed Apr 08, 2009 4:30 pm

on the good and bad scale, its towards the bad end

you want atleast a 10-12% FOC for decent flight... 10-20% are the norm averages

14-20% are about perfect

but its to each their own

a 8% FOC is going to be affected by wind more so

btw, those bolts I made for you way back have a 19-20% FOC figure

wildwindom · Post by **wildwindom** » Wed Apr 08, 2009 4:34 pm

crazyfarmer wrote:on the good and bad scale, its towards the bad end

you want atleast a 10-12% FOC for decent flight... 10-20% are the norm averages

14-20% are about perfect but its to each their own

a 8% FOC is going to be affected by wind more so

btw, those bolts I made for you way back have a 19-20% FOC figure

Those are the ones i checked plus some others i just made up which are pretty much the same thing 7 inch wraps 2" blazer vanes brass insert aluminum nock i must be doing it wrong.

crazyfarmer · Post by **crazyfarmer** » Wed Apr 08, 2009 4:37 pm

you have to be.... If you hold that arrow and try to balance it on your finger with a fieldtip on it, then it should balance about 6-7inches from the brass insert end. Thats roughly a 19% FOC. An 8% arrow is gonna balance way back in the middle of the arrow

It almost sounds like you didnt punch inthe bhead weight

mikej · Post by **mikej** » Wed Apr 08, 2009 4:42 pm

how long is a 2219

crazyfarmer · Post by **crazyfarmer** » Wed Apr 08, 2009 4:44 pm

wildwindom wrote:
Those are the ones i checked plus some others i just made up which are pretty much the same thing 7 inch wraps 2" blazer vanes brass insert aluminum nock i must be doing it wrong.

ok the total arrow is roughly 21inches with the fieldtip or bhead on
The balance point is exactly 7 inches from the tip of the fieldtip or bhead

FOC by that is saying

Calculated Front Of Center Percentage is:
16.6667 Percent Front of Center

but with other methods which use more info I get 19%

Cossack · Post by **Cossack** » Wed Apr 08, 2009 4:46 pm

The length of the 2219 depends on the bow...it's the diameter designation.

wildwindom · Post by **wildwindom** » Wed Apr 08, 2009 5:58 pm

crazyfarmer wrote:
wildwindom wrote:
Those are the ones i checked plus some others i just made up which are pretty much the same thing 7 inch wraps 2" blazer vanes brass insert aluminum nock i must be doing it wrong.
ok the total arrow is roughly 21inches with the fieldtip or bhead on
The balance point is exactly 7 inches from the tip of the fieldtip or bhead

FOC by that is saying

Calculated Front Of Center Percentage is:
16.6667 Percent Front of Center

but with other methods which use more info I get 19%

Dummy me i didnt have any tip in just the arrow

wildwindom · Post by **wildwindom** » Wed Apr 08, 2009 6:03 pm

Ok i put a field tip in did the measurements and i got 17.5513 that sounds better.

crazyfarmer · Post by **crazyfarmer** » Wed Apr 08, 2009 8:57 pm

wildwindom wrote:Ok i put a field tip in did the measurements and i got 17.5513 that sounds better.

good job;) depending on the length of your bhead, its gonna go down to 16%

I always measure the setup I want to hunt with so the total length is always the arrow plus the bhead and nock.