FOC Question

[CT.HNTR]

If all arrow components are identical and the only difference is the length of the shaft will a longer shaft produce a higher FOC or a lower FOC?

[Boo]

This is a great way to answer that and other questions about arrow builds.
https://www.goldtip.com/Resources/Calculators/FOC-Calculator.aspx

[CT.HNTR]

Thanks Don,

This calculator is very helpful. The longer shaft reduces FOC but only by a very small amount. The weight of the front insert and broadhead are what influence the FOC to a very high degree.

[xcaliber]

Thanks Don,

This calculator is very helpful. The longer shaft reduces FOC but only by a very small amount. The weight of the front insert and broadhead are what influence the FOC to a very high degree.

Just think of a see-saw when you were a kid. It's really quite simple, but this calculator does spell it out nicely, and you can try different insert & broadhead weights, pretty slick!

Thanks Don.

[gerald strine]

This may be a bit easier method to determine foc .

I just did mine using a yard stick on edge to balance on and my foc is 17.5 with a XX75 2219 ,175 gr Slick trick standard aluminum insert , plastic nock and blazer veins out of a 350 Matrix.
Looks like I could go to the 150 grain head if I had to but I am sticking to what is working fine.

https://archerycalculator.com/arrow-front-of-center-foc-calculator/

[nchunterkw]

Conceptually I find it easiest to think of it like this.

FOC is a measure of how far forward of the center point of the shaft that arrow balances. It is expressed as a percentage of total arrow length.

For example:
Total arrow length = 20"
Center point = 10"
Arrow balances on a point 4" forward of the center point

FOC = 4"/20" = 20%

More weight up front OR less weight in the back will move the balance point farther away from the center point = increase FOC
Less weight up front OR More weight in the back will move the balance point closer to the center point = decrease FOC

You can nitpick to death how you measure the total length and if you should include the broadhead or not...all it does is change the number it does not change the arrow performance. Just be consistent with how you do your measurements when comparing arrow setups.