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Originally posted by Dry Bones View PostHey Rick, it always tells me a WAY stiffer spine, and I almost completely quit looking at any of the online spine calculators. Nice Homepage though.
Everything has to be entered correctly, or it'll be way off on the calculation.
If I had your spec, I bet I could calculate an arrow that works, and I bet it'll be close to if not spot on to what you are using now.
Rick
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Originally posted by DRT View PostTold me basically the same thing as the 3rivers one except Stu doesn't list Black Eagle arrows.
Here's a screen shot of my current bow & arrows entered into the calculator in raw data, instead of using manufacturers selections.
It is spot on. Shows my arrows to be slightly weak, which I do on purpose.
Rick
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Trying the calculator.
This is what I meant about the spine was showing Very weak.
Never mind I cannot make the screen shot post.
Dynamic spine of arrow was 42.6
Longbow required says 48.1
GT 500- 3555- 100 gran brass- 145 grn point- 3X3" Feathers average nock weight is 15 grains
On my scale the longbow is 48# @ 28 inches and cut to 1/16 so with rest is 1/8 from center with fast flight stringLast edited by Dry Bones; 10-08-2017, 03:20 PM.
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Originally posted by Dry Bones View PostTrying the calculator.
This is what I meant about the spine was showing Very weak.
Never mind I cannot make the screen shot post.
Dynamic spine of arrow was 42.6
Longbow required says 48.1
GT 500- 3555- 100 gran brass- 145 grn point- 3X3" Feathers average nock weight is 15 grains
On my scale the longbow is 48# @ 28 inches and cut to 1/16 so with rest is 1/8 from center with fast flight string
I'm assuming that's a +1/8"?
Your draw length is 28?
To back of point length of arrow?
Type of string, and strand count?
RickLast edited by RickBarbee; 10-08-2017, 04:06 PM.
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I've been working on arrows for my Big Jim today. Your calculator and the 3 rivers gave me similar results. However I had so much left nock left it was scary. Randy has been kind enough to coach me through the process so far. I've trimmed an inch and three quarters off and getting decent bare shaft flight now. But dang it's been a process. Just the opposite with my Widow. Calculator says, I does, it worked.
Sent from my SM-J710MN using Tapatalk
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Originally posted by DRT View PostI've been working on arrows for my Big Jim today. Your calculator and the 3 rivers gave me similar results. However I had so much left nock left it was scary. Randy has been kind enough to coach me through the process so far. I've trimmed an inch and three quarters off and getting decent bare shaft flight now. But dang it's been a process. Just the opposite with my Widow. Calculator says, I does, it worked.
Sent from my SM-J710MN using Tapatalk
Since the calculator has to work from center, any deviation of grip from center will throw it off.
On any bow, you need to figure out your grip on the bow, that gives you the center line. If you can't do that, and have an arrow that works like you want it to - well then, that's what the personal form factor adjustment in the calculator is for, (among other things).
Rick
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