What would be an ideal front of center balance point measurement?

This is our main discussion forum...post anything that relates to bowhunting or archery.

What would be an ideal front of center balance point measurement?

Postby edersbow.com on Mon Jul 20, 2009 8:34 am

Below is an article posted on www.edersbow.com, please comment on, ask questions about or discuss this article below.

Question:
What would be an ideal front of center balance point measurement? I am shooting an arrow that is 30 1\8 inches from the tip of the nock to the tip of the broadhead. The true center is, of course, 15 1\16 inches. The balance point is 11 15\16 from the tip of the broadhead. Giving me a difference of 3 3\16 inches. Is this a good set up? What are the guidelines on front of center when building a hunting arrow?

Answer:
In the first place you are measuring it incorrectly. Arrow length is from the bottom of the nock groove to the end of arrow, not to the tip of the broadhead. This makes it tough to completely evaluate your shaft. Ideally, you want a hunting arrow to have an FOC of 7 to 10 % with 9 % being the standard most experts recommend. Here is the proper procedure for measuring FOC: (this is reprinted from a tip that was online in January)

Install your broadhead. Find the arrow’s balance point by sliding it back and forth along a fairly sharp edge. You’ll find the spot where the arrow just balances. Mark it carefully. Now measure from the bottom of the nock groove to the balance point and write this number down for later.

There are different conventions for measuring overall arrow length depending upon the type of point you are using.

Arrows that include inserts: Measure from the bottom of the nock groove to the end of the arrow not including the insert. This is often referred to as the arrow’s cut length.

Shafts with swaged tips: The overall length is measured from the bottom of the nock groove to the most forward extension of the full diameter of the shaft, just behind the swage.

Shafts that include outserts: Measure from the nock groove to a point ¾ inch forward of the rearward end of the outsert.

Shafts with glue-on heads: Measure from the nock groove to the most rearward portion of the glue-on point.


Determine FOC: To find the FOC (which is always expressed as a percentage) divide the overall length by two. Now subtract this number from the balance point and divide by the overall length. Multiply by 100.




Original Article: What would be an ideal front of center balance point measurement?
edersbow online bowhunting magazine, blog and forums.

http://www.eders.com
http://www.edersbow.com
http://www.ProBowhunter.com
User avatar
edersbow.com
 
Posts: 0
Joined: Tue Jun 30, 2009 8:19 am
Location: New York

Re: What would be an ideal front of center balance point measure

Postby Dave Eder on Fri Jul 24, 2009 2:50 pm

just curious, how many people pay attention to front of center. i really don't personally.
Dave Eder
User avatar
Dave Eder
Site Admin
 
Posts: 180
Joined: Mon Apr 21, 2008 11:22 am
Location: new york, new york

Re: What would be an ideal front of center balance point measure

Postby bear402 on Fri Jul 24, 2009 6:23 pm

I definately do !

If you have to much weight in the rear of the arrow , the tendancy will be for the arrow to plane , Particularlly with open bladed fixed broadheads. Arrows with to little F.O.C can get really squirrely in flight.

If there is to much weight on the front end the arrow will nose dive at longer ranges . The end result will be a wider trajectory resulting in wider pin gaps on your sight. Not a big deal at 30 yards , but it can have a huge effect if you shoot longer yardages such as those involved in Western Bow Hunting.

Luckily most of the arrow lengths and head weights that are used on modern arrows will fall within acceptable parameters.

You might have to take a look at setups such as 4 or 5 inch vanes with lightweight 85 grain or less heads . Lighter vanes may be required to keep the F.O.C. in check.

125 grain or heavier heads with blazer type vanes can be nose heavy and dive a little at longer yardages.
Image
User avatar
bear402
 
Posts: 499
Joined: Wed Apr 23, 2008 9:47 pm



Return to Bowhunting

Who is online

Users browsing this forum: No registered users and 31 guests