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FOC calculation

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Old 06-30-2008, 02:12 AM
  #1  
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Default FOC calculation

Just attempting to wrap my head around this, if I cut my arrows shorter with this increase or decrease the FOC? Assuming same wgt tip etc.

Shooting a Mathews Switchback XT 70lb, 28" draw, 29.5" Beman ICS Hunter, 100gr tips
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Old 06-30-2008, 06:33 AM
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Default RE: FOC calculation

I don't even want to try and wrap my brain around it.

Go here. http://home.att.net/%7Esajackson/archery.html Arrow FOC and Weight, second one down on the menu. Click on your brand of arrow or the equivalent and plug in your numbers. Record that weight and FOC then change the length to what you intend to cut your arrows at and run it again. That'll tell you what you want to know.

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Old 06-30-2008, 07:05 AM
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Default RE: FOC calculation

Another calculator. From Goldtips website.

http://www.goldtip.com/calculators/foc.asp
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Old 06-30-2008, 07:31 AM
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Default RE: FOC calculation

ORIGINAL: valor10

Another calculator. From Goldtips website.

http://www.goldtip.com/calculators/foc.asp
+1
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Old 06-30-2008, 09:13 AM
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Default RE: FOC calculation

Depending on how much you cut off them you will see a slight rise in the FOC but the spine will be stiffer so to get the spine back in check you will have to go to a heavier head or even a brass insert either 50ge or 100gr.

Once again it all depends on how much you cut off.
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Old 06-30-2008, 08:04 PM
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Default RE: FOC calculation

I think that FOC is blown way out of proportion these days. Sure its important and all... but only if you have haneously too little or in certain limited cases extremely too much. Especially with carbon arrows... if you are over 9 and under 20 then you are fine... I'd be more worried about the change in the spine/reaction of the arrow.
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Old 06-30-2008, 08:44 PM
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Default RE: FOC calculation

ORIGINAL: Kanga

Depending on how much you cut off them you will see a slight rise in the FOC but the spine will be stiffer so to get the spine back in check you will have to go to a heavier head or even a brass insert either 50ge or 100gr.

Once again it all depends on how much you cut off.
You remember what FOC the arrows are for the Black Ice? The Extreme are 20% if I remember corretly but I may have to depend on the B/I or Extreme since the son is plinking with the Victory andit needs new string.I may restring it and have all 3 I can depend on...I'm lethal with all 3...on targets.
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Old 07-01-2008, 12:42 AM
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Default RE: FOC calculation

[quote]ORIGINAL: Arthur P

http://home.att.net/%7Esajackson/archery.html


ORIGINAL: valor10

Another calculator. From Goldtips website.

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



Which calculator is correct?One says to measure from nock to tip point the other saysexclude nock and point.
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Old 07-01-2008, 03:36 AM
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Default RE: FOC calculation

ORIGINAL: RLoving1

ORIGINAL: Kanga

Depending on how much you cut off them you will see a slight rise in the FOC but the spine will be stiffer so to get the spine back in check you will have to go to a heavier head or even a brass insert either 50ge or 100gr.

Once again it all depends on how much you cut off.
You remember what FOC the arrows are for the Black Ice? The Extreme are 20% if I remember corretly but I may have to depend on the B/I or Extreme since the son is plinking with the Victory andit needs new string.I may restring it and have all 3 I can depend on...I'm lethal with all 3...on targets.
Rowel.

From memory ( and I have had a sleep since then ) they are around the 24% mark
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Old 07-01-2008, 10:57 PM
  #10  
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Default RE: FOC calculation

ORIGINAL: valor10

Another calculator. From Goldtips website.

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

appreciated guys, thanks
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