tell me your EFOC setup

[foudarme]

in order to help me to make some comparisons, could you EFOC people post here your EFOC setup like that:

bow:
draw weight:
draw length:
string: dacron or modern?
arrow length and species:
shaft static spine or deflection:
feathers, number and length:
point's weight:
additional weight eventually:
total arrow weight:
EFOC in %:
arrow speed if known:
momentum if known:

thanks...

[groyce]

55# Northstar recurve
27.5 inch draw
carbonwood 45/60 @ 29 1/4 inches
100grain brass insert
165 grain tip
3-4" RW offset parabolic
23% FOC
total arrow weight about 580gr

[Orion]

Tapered (11/32 to 5/16) wenge footed POC woodies, 28 7/8 to BOP (28-inch draw), 160 grain STOS broadheads,three 5-inch left helical shield cut feathers.  About 675 grains, 75-80# spine, 19% FOC.  Hunt them with a 62# Hill and 58# Robertson longbow.

[trapperDave]

45# Pearson Hawk
B50 string
35-55 goldtips cut to 28" ..deflection .500
100gr brass insert
50 gr bh adapter
130 gr bh
2 fletch (5" shields)
total wgt=482gr

gives me a balance point 6 inches behind the head, 22 inches in front of the nock

 

[foudarme]

please, I forget to ask your shaft spine deflection and your string nature (dacron or modern), thanks to add it!

[Bjorn]

53# ACS CX
27" draw
4 strand D97 string
29" Hunting tapered cedar with long Osage footing
3 4" low profile feathers
80-85#, 160 gn BH, 650gn total
about 19% foc
Deadly quiet
 

[pdk25]

RER takedown recurve
63#
29"
fast flight
30 3/4 inch axis full metal jacket 300
.300
3 helical 4" feathers
190 grain broadheads (use 175 grain field points and 5 grain adapter ring for practice)
100 grain brass point insert
Total arrow weight about 665 grains
FOC about 23.5%
Don't know speed or momentum

[foudarme]

up please

[Morning Star]

bow:     Widow PTF
draw weight:    53lbs
draw length:    27"
string: dacron or modern?     Dyna 97
arrow length and species:     28" Beman MFX Carbon
shaft static spine or deflection:    400
feathers, number and length:    5" feathers
point's weight:    200 grain  
additional weight eventually:    100 grain brass insert
total arrow weight:    620 - 625
EFOC in %:
arrow speed if known:    162 fps
momentum if known:    no idea

[Dave2old]

Single-tapered wood shafts, from light to heavy depending on game. Heavy heads. I would try footed shafts but can't afford 'em. Average bow is r/d longbow, 55#@28". Dave

[drewsbow]

Abbott longbow
42@28
30" so 48 @ 30
6 strand D97
31" to back of point / beman ics energy 460
.460 deflection
3 two inch rayzr feathers
310 gr point
550 gr total
24 % efoc

[foudarme]

up please

[robtattoo]

bow: Various
draw weight: 62-63#
draw length: 30"
string: dacron or modern? TS+
arrow length and species: 31" Beeman MFX 340
shaft static spine or deflection: .340"
feathers, number and length: 4x3" Parabolic, 90*
point's weight: 200gn
additional weight eventually: 100gn insert
total arrow weight: 660gn
EFOC in %: 21%
arrow speed if known: 172-191 depending on bow used
momentum if known: Unknown

[Kingwouldbe]

Trapper Dave, tell me about your 2x5" feathers, I just tried 2x3" with great results, I know it's only 6" of total feather, I like the way it clears the bow.

I was also thinking along the lines of DrewsBow, with 3x2" which is still 6" of feather.

With EFOC you don't need a lot in the back end to steer your arrow, it just slows it down like a flu-flu.

[Jack Denbow]

I have just started playing around with EFOC. I normally shoot shafts that are 55-60# spine. When I added more weight up front I had to go up 10# in spine. I got the extra weight up front by using 125gr. woody weights. They flew great and I like the way they smack the target with authority.
Jack

bow:Great Northern Fireball
draw weight:52#
draw length:27.5"
string: dacron or modern?dacron
arrow length and species:28.5" Tapered larch
shaft static spine or deflection:65-70#
feathers, number and length:4-4" parabolic @90
point's weight:145gr.
additional weight eventually:125gr. woody weight
total arrow weight:735gr.
EFOC in %:20%
arrow speed if known:?
momentum if known:?

[BlueBarred]

I have studied the posts on this forum for a while now but haven't contributed much being a relative newbe. But lately there has been so much incredible info posted here that I felt compelled to put something out there!

Bjorn, that beautiful arrow of yours really makes me consider going back to wood!

Anyway, here is what has been shooting very well for me. The small 4 fletch steers a 160 grizzly just like a fieldpoint, is quiet, and holds up well when wet. Thanks to all and have a safe and happy holidays.
Dave    

Bow:Brackenbury Quest
Draw Weight:54#@29
Draw Length:29.5"
String: 12 strand D97 w/wool silencers
Arrow Length/Type:30" BOP, CT Rhino 45/70
Fletch: 4X2.5" A&A w/turbulator!
Point weight/Arrow weight: 200gr/600 grain
Insert: 100 gr brass
EFOC:24.2%
Speed: 165fps +/-

[John3]

I am still old school. I just did the fomula for FOC on my POC shafts and I'm at 10.8...
I've never worried about these things because I tune to perfection and the arrows always do their job if I do mine correctly.

I have to ask. What is the advantage of all that extra weight up front? I did the math on two of the set ups in this thread and they both are getting only 36 foot pounds of energy. Would you really want to shoot a Moose or Elk with that set up? How do these heavy FOC shafts penetrate really large game?

[Lonesome Wind]

bow:self made R/D longbow
draw weight:61#
draw length:29"
string: dacron
arrow length and species:30" BOP Kingwood footed tapered Ash
shaft static spine or deflection:60#-65#
feathers, number and length:3-5.75 swift cut turkeys
point's weight:190gr Griz
additional weight eventually:200gr woodie weight
total arrow weight:997gr
EFOC in %:21%
arrow speed if known:152fps
momentum if known: ?
This is what I shot in Africa with great success!

[foudarme]

up    

[Kingwouldbe]

Originally posted by JDS3:
I am still old school. I just did the formula for FOC on my POC shafts and I'm at 10.8...
I've never worried about these things because I tune to perfection and the arrows always do their job if I do mine correctly.

I have to ask. What is the advantage of all that extra weight up front? I did the math on two of the set ups in this thread and they both are getting only 36 foot pounds of energy. Would you really want to shoot a Moose or Elk with that set up? How do these heavy FOC shafts penetrate really large game?

JDS3, you got to read what the Doc. has been doing, it's not about the foot pounds, it's about momentum, mass in motion stays in motion.

The EFOC just increases the penetration on the same weight arrow.

I think a golf club is a good example, take a driver, distribute all of the weight in the shaft equally, see how far it hits, or transfers it's energy to the ball.

Now put all of the weight in the head of the club, like they have done, BAM!!!! WOW!!!! now all, or most of the energy is transferred to the ball, or in our case to the arrow.

Hope this knucklehead helped you understand it, go here for more info.
  http://tradgang.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=24;t=000013