FOC question
#1
FOC question
Years ago I never heard talk of FOC but It seems these days It's a common thing to hear on hunting forums. I've always figured I've done fairly well on setting my bow and arrows up to what they should be. I've recently got some Interest In this FOC so I checked mine and according to the formula I used I'm much lower then what I figured I'd be. My arrows have always flew good for the most part. I occasionly get one to kick sideways here and there but I'm sure that's more related to a bad release and possibly a short draw here and there. How do you guys check to see what your FOC Is? I've seen 2 different ways to do It. One way shows I'm good and the other shows I'm way low. If my FOC Is low I'd like to get It up to where It should be.
Thanks In advance.
Thanks In advance.
#5
Dominant Buck
Join Date: Feb 2003
Location: land of the Lilliputians, In the state of insanity
Posts: 26,274
RE: FOC question
Its just the percent of weight forward. I simply find the fulcrum, measure it to the midline and find out the percent of mass that is forward. I like a higher foc for penetration. I use stiff shafts with lots of head weight. I do it for the quite shot and penetration. A higher foc can help the fletching stabilize the arrow a bit.
Low foc is ok with compounds, like 10-12%. But with a trad bow, I like to have much higher. Ive not calculated foc in a long time. Simply because ive had no problem with penetration. Ive stuck with a 650 grain arrow and 145 grain head. But since you mentioned it,I might have to figure mine, just to see what it is. Im like you, when it aint broke, I dont fix it.
Low foc is ok with compounds, like 10-12%. But with a trad bow, I like to have much higher. Ive not calculated foc in a long time. Simply because ive had no problem with penetration. Ive stuck with a 650 grain arrow and 145 grain head. But since you mentioned it,I might have to figure mine, just to see what it is. Im like you, when it aint broke, I dont fix it.
#6
RE: FOC question
Well I just checked It again using the formula Bob gave me In that link.
Here's the results using 2 different methods-
Including the tip- 7.7%
Not Including the tip- 12.1%
According to Ashby I should go by the 1st result. I've never had a penetration problem but I can say this that this summer I'll be experimenting with this and most likely I'll be adding brass Inserts to get my weight and FOC up. Currently right now my arrows weigh In at 561 grains. That Includes my 125 grain Snuffer.
Here's the results using 2 different methods-
Including the tip- 7.7%
Not Including the tip- 12.1%
According to Ashby I should go by the 1st result. I've never had a penetration problem but I can say this that this summer I'll be experimenting with this and most likely I'll be adding brass Inserts to get my weight and FOC up. Currently right now my arrows weigh In at 561 grains. That Includes my 125 grain Snuffer.
#8
RE: FOC question
I use a FOC of 24%.
#9
RE: FOC question
Steve.
Thats with a 125gr tip and 100gr brass insert
The next set of shafts I get are going to be the next spine up and use a 200gr tip and 100gr insert
That should give me some thumping power
Thats with a 125gr tip and 100gr brass insert
The next set of shafts I get are going to be the next spine up and use a 200gr tip and 100gr insert
That should give me some thumping power