Firebolt Arrow - 13.76 % FOC

[DARTONATOR]

Hope this info helps some people out. I built these arrows from a six pack of stock firebolt arrows. I stripped them down and this is what I ended up with.

Bare firebolt shaft - 199 grains, 9.95 grains/ inch
2 inch blazers - 3 x 6 grains / vane = 18 grains
Aluminum flat nock - 19 grains
110 grain brass insert
125 grain Stricknine broadhead
10 grain - 7 inch wrap

Total weight 480 grains


This arrow shot through the Exomax with a FFF string pumps out a speed of 321 FPS

The FOC of this arrow is 13. 76 %


Question ? How much extra FOC can I get if I switch my aluminum nock to a plastic flat nock ?

[Stash]

Question ? How much extra FOC can I get if I switch my aluminum nock to a plastic flat nock ?

Not enough to make a damn bit of difference to your accuracy or speed.

[vixenmaster]

about a 1/4 % i reckon

[skamaniac]

Unless i'm missing something, using two different FOC calculators, i come up with an FOC both exceeding 17% using your recipe.

http://www.goldtip.com/calculators/foc.asp

http://www.cacciaebalestra.altervista.o ... Main0.html

[DARTONATOR]

The numbers that I used for my FOC are as follows .

Arrow total length - 22.25 inch
1/2 total length - 11.125 inch
Balance point - 8.0625 inch
1/2 length subtract balance point - 11.125 - 8.0625 = 3.0625 inch

FOC = 3.0625 / 22.25 x 100 = 13.76 %

Can anyone double check to see if I did the calculations right ? Thanks.

[Stash]

Some people measure the whole arrow tip to tip. Some people measure only the actual shaft length. With a long broadhead like yours that could give very different calculated results.

There is no "industry standard".

But when you're measuring to 4 decimal places, you're being WAAAYYYYY too picky.

[crazyfarmer]

btw, its nothing wrong with a 14% FOC either.. I shot that for years and loved it;)

Its all in how your arrow flies.. if it flies good, dont worry about FOC.

[Big John]

Agreed Crazy. I think anywhere from 12 to 18% FOC is all good.

[DARTONATOR]

Sorry about the four decimal places guys. Its a lot easier if you get measurements that end up being closer to the quarter inch mark ( .25 ) on the tape measure.

Question ! I just helped a buddy pull the aluminum inserts from his brand new powerbolts. When we went and tried to put the brass inserts that I used on my firebolts onto his powerbolts, they were too tight. I ended up putting the brass insert into a drill bit with a field point and filing down and sanding to get them to fit right. Is there a different size brass insert that should be used to fit the powerbolts ?

[vixenmaster]

i don/t think they make one fer power bolts. thats why many don't buy them

[Stosh]

I like this one.
http://www.lmariana.com/foc.htm

ez, Stosh