millerhunter13

i am getting new arrows for my new bow, i found out that i need to have my arrows at 27 inches for the right spine, and i shoot 125 grain BH, i figured out my FOC it is 14.17% so what does that mean?



Edit: crap i forgot to add the weight of the insert does anyone know how much a easton st epic insert weighs?

MeanV2

I like to keep my Broadheads between 12% and 15% FOC. It sounds like you are good to go unless you decide to experiment with Extreme FOC. I built some FMJ's late last year using Brass HIT inserts and the FOC ended up over 20% They fly Awesome and group unbelieveable at longer distances. Those 500 grain arrows leave my Guardian with next to Zero noise!

Dan

millerhunter13

well what does it mean that i have 14.17% FOC, and if my insert weighs 8 grains which i think it does my FOC will be 14.97%.

MeanV2

Simple explanation is if you arrow were 27" long and had a FOC of 10% it would actually balance 2.7" in front of the actual measuredcenter. The FOC % is the percentage of the total arrow length measured from actual center to where it will actually balance. I figure all mine the old fashioned way, measuring, marking, balancing, and then calculating the %.

Dan

millerhunter13

O ok, i get it now.