EFOC w/ Gold tips, how?

[plentycoupe]

Been following the Ashby reports and want to build an arrow with EFOC

I have some unfinished gold tip shafts and a bunch of weights to go with em.

 I noticed that when you start adding a bunch of weight to the front the weight system just keeps getting longer and longer, in turn this is not actually adding the weight to the point. Not as far as balance is concerned.

Has anyone completed some arrows with over 20% FOC? If so how did you accomplish this?

What grain field points do you use and what broadheads that match the weight of field points?

Will post other questions as I think of them.

Thanks
Jason

[peak98]

I'm shooting a 29" GT with 100gr brass inserts and 200gr field tips/broadheads. I don't know exactly how much FOC this comes out to but they sure do fly well. Actually, I can go from 145gr to 200gr and get good flight, but I see better penetration shooting a GlenDel buck with the 200gr heads.

[plentycoupe]

oh yeh

am shooting a ACS CX longbow. 53lbs @ 27 inches.

[plentycoupe]

peak98,
what type of broadhead are u using?

[peak98]

190 grain Simmons Interceptors or 200gr Muzzy Phantoms.

[jrchambers]

i just set up some 7595 gts for my 58lb shrew. i have a 175 tip with 300 grains of brass weights behind it.  im prety shure i have efoc, i dont know for shure if not its so close i dont care but i know my last setup was 17% and these are much higher, they also weigh 820. and shoot well

[plentycoupe]

jrchambers,
what type of broadhead do you shoot?
Thanks

[jrchambers]

i shoot 145 stos with inserts to 175 for any thing tougher than deer and 175 razorcaps for bbears and deer, what part of ak are you from

[Soilarch]

I know exactly what you're saying.  I measured FOC with the goldtip system.

With a 125gr tip my arrows measured:
1 50gr insert =16.6%FOC
2 50gr inserts=18.8%FOC
3 50gr inserts=20.6%FOC
4 50gr inserts=22.2%FOC

That's 2.2% increase from 1 to 2, 1.8% from 2 to 3, and 1.6% increase from 3 to 4.  

I thought there'd be a MUCH quicker loss of return. Not all the weight is going in the very tip but it's still jacking FOC up.  It's a headache dealing with that many inserts though.  I'd buy the heaviest BHs that fit your requirements to keep the inserts to a minimum.

[Pete W]

 I use 100 gr brass inserts and 300 gr Extreem broadheads,and 300 gr Extreem points.On 29" shafts the FOC is getting up there.
 There are other BH combinations that will bring up the weight, any 175 or 200 gr glue on with a 100 or 125 steel adapter works fine also.
All of my carbon shafts get a 100 brass first thing.

Pete

Pete

[ozy clint]

i have an efoc gt setup for both my 54# & 69# bob lee recurve limbs.

54# setup- 55/75 with 100gr brass insert + 245gr b/head, for a 615gr arrow with 26% foc.

69# setup- 75/95 also with 100gr brass insert + 245gr b/head, now here's the tricky part- inside (and upfront) i've got a piece of the white 8gr/" weight tube about 1 3/8" long. inside of that i've glued a piece of 4mm diameter welding rod the same length. (it fits perfectly). that bit weighs 65gr. the rest of the arrow is filled with the lighter black 3gr/" tube. total mass is 780gr @ 24% foc.
the little white weight could be made to any length you want depending on the weight you want.

the hard part is striking a balance between the finished arrow weight, the foc you want and whether it will tune before you reach your minimum arrow length.

just how i came up with my arrows. hope it helps. i think my welding rod weight idea is good because you can make it what ever you need and it all sits upfront. if you could find somthing denser than steel that would fit in the wt tube it would help more. lead or solder wire?

[plentycoupe]

ozy clint what broadhead do you use and is it the same diameter are the arrow shaft.

[ozy clint]

i use an aussie made blackstump 2 blader. it is a standard 11/32" glue on b/head. so, yes it's bigger than the shaft.

[Stone Knife]

I'm shooting GT3555"s with a 50gr brass insert and a 135 gr broadhead. When shot at a deer with a 45# bear Grizzly they go through the front, center and then out the other side, that is good enough FOC for me    I hate getting too technical.

[foudarme]

generally with 400gr at the extremety of your arrow you get a huge EFOC if you don't use a weight tube, but don't forget that putting 400gr at the extremity of your arrow will greatly decrease your arrow spine...if one considers 5# each 25g above 125gr, it will give 55# of less..with my 50@29 ACS i shoot a 75/95 GT with a 300gr BH and a 100gr insert for a 28% EFOC

[Whip]

I shoot 125 grain Wensel Woodsmans glued on to a 100 grain steel adapter with a 100 grain brass insert in the front of my arrows for a total head weight of 325 gr.  

GT 55/75's, and I pull 57@ 29"  Arrows are cut to 30 1/2.

[L82HUNT]

Shoot Easton axis  300.  Cut at 29"  with 2" of 2016 as a footing.  A 100 grain brass insert.  A 125 grain steel adapter and a 170 grain broadhead.  Ends up a little over 25% FOC

[plentycoupe]

I am going to try putting my arrows together with
100grn brass insert
100grn steel adapter
150grn grizzly
will use 250grn field points for testing.

Plan on using gold tip 55/75, will start with full length shafts and trim shorter as I bare shaft tune them.

I don't believe this will get me around 700grns, which is what I am looking for.

If I add weed eater string inside, will this change the spine??

[ozy clint]

i think you'll end up around 620gr total. that's very similar to my 54#@28" setup. maybe you could try a heavier b/head, perhaps a 190gr grizzly or anything around 200gr because you have a shorter draw than me and i suspect that you'll have enough arrow to get it stiff enough. that way you might be up around the 690-700gr that you are chasing. let me know what you come up with.

[Jason Jelinek]

plentycoupe,

That's what I'm using, both with 5575 and 7595.  The 7595 is about 1/2" longer than the 5575.  They are about 625 grains.  Got a complete passthrough on a good sized mule deer doe this year with it.

Jason