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Old 10-14-2018, 10:34 PM   #1
Grits
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I am looking at getting some Gold Tip carbons to shoot out of my Thunderhorn III, 45@28, FF and my draw length is 28 or a hair over. Planning on them being 29" long with a 135 Zwickey broadhead.
Do I get 400 or 500 spine, the chart says 400.
Thanks in advance,
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Old 10-14-2018, 10:38 PM   #2
Bisch
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The only way you are likely to get a .400 to work at 29Ē would be to put a whole lot of weight up front, like 300-400gr. I think the .500 would likely need extra weight up front too if your draw weight is 45#.

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Old 10-14-2018, 11:12 PM   #3
speck1
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I agree with Bisch. My longbow is 54@28. Easton axis traditional arrows cut to 30.75. They are 400 spine. I have 225 grains up front. They fly like darts. I would think you would need a 500 spine.
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Old 10-15-2018, 07:18 AM   #4
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Thanks for the info. What about a 600?
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Old 10-15-2018, 09:33 AM   #5
cbc0905
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Plug your info into the three Rivers calculator. Seemed to get mine really close.

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Old 10-15-2018, 11:10 AM   #6
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I don't know how the rest on that bow is cut (relative to center.) I am shooting a bow that is past center and I am shooing a bow that is slightly heavier with 29" arrows and I am using .500 with 50-100 extra grains up front than what you have. But every bow is a little different.

I would probably stick with .500 spine... and start an inch longer (30") and trim/add weight as you see fit. The thing I don't like about 600 spine is they seem much harder to find in the heavier shaft weights.
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Old 10-15-2018, 11:13 AM   #7
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And one thing... if you go with .500 and start at full length and if you can't get them tuned with adding more weight, etc... it is so much easier to sell long/uncut arrows than it is ones you have cut down short.
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Old 10-15-2018, 12:16 PM   #8
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Thanks again guys! I have used the calculator on 3Rivers and Stu's Calculator and they never seem to get it right, sometimes close other times not so close.
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Old 10-15-2018, 01:15 PM   #9
MEsquivel
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For reference.

I shoot 400's out of a 55@26.
With 275gr up front.

I shoot 500's out of a 47@26
With 175gr up front.

On a side note: You can't plan to leave them certain length. You need to tune them to where you need them. 1/4" in arrow length will make a difference in your setup.
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Old 10-16-2018, 11:29 PM   #10
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600 fly great out of my 45 lb bow, i use the gold tip trads with the pdf weights with the tuneable nocks and inserts. The weights come in 5,10, 25 grains. You can get the arrows to fly like darts with out feathers


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Old 10-16-2018, 11:58 PM   #11
Easttxbowman
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My satori is 45@28 but I’m drawing right around 29... 400s were way stiff and I even tried some massive tip weight (300 +75gr brass insert). I ended up tuning out perfect with a full length 500spine with 75 brass insert and 150gr tips.
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Old 10-26-2018, 11:50 PM   #12
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Quote:
Originally Posted by Easttxbowman View Post
My satori is 45@28 but Iím drawing right around 29... 400s were way stiff and I even tried some massive tip weight (300 +75gr brass insert). I ended up tuning out perfect with a full length 500spine with 75 brass insert and 150gr tips.

That sounds very familiar, Same setup for my 45 drawing 29 inches
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Old 10-27-2018, 11:48 AM   #13
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Iím shooting 400ís , 300 grains up front, 29.25 draw length, 31.5 inch arrows, right at 50lbs, bare shaft great, fletched up really well, Sarrels SR


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Old 10-27-2018, 12:30 PM   #14
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The gold tip chart is way misleading. I know from experience.
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Old 10-30-2018, 01:52 PM   #15
76aggie
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Remember, the charts are just a guide. Not gospel. Experiment and find what is right for you.
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Old 10-30-2018, 04:07 PM   #16
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The diameter of the shaft, plus the thickness of the strike plate material you use is going to impact things some,

BUT

for what you have, and are looking for - Go with the .500's, and it will put you into a very successfully tuneable arrow, with plenty of room for length adjustment if needed.

Looks like 29.5" to back of point length is going to be spot on, but start long, and trim them down a little bit at a time till you get there.

This graph shows the match up to your bow with Goldtip Trad .500's with 135gr heads, 5" feathers, and cut to 29.5" back of point length.

The blue, and green bars are the ones of importance, and they are almost a dead nutz match.

Here's the link to the calculator if you want to play with it some:
http://www.taylortel.net/~rickbarb/d...alculator.html

If you have any questions, just ask.

Hope it helps.

Rick
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Old 10-30-2018, 04:14 PM   #17
Grits
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Thanks a lot Rick, I appreciate it. What about aluminum, would a 1916 or a 2016 be a better fit?
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Old 10-30-2018, 04:27 PM   #18
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Quote:
Originally Posted by Grits View Post
Thanks a lot Rick, I appreciate it. What about aluminum, would a 1916 or a 2016 be a better fit?
Grits
You're quite welcome.

To be anywhere near the length you want, the 2016's are going to be considerably stiff, and the 1916's considerably weak, that is unless you want to change point weights, which I didn't figure you do.

With 135gr heads, and at the length you want (within reason) 2013's should be easily tuneable to satisfaction.

Rick

EDIT:
P.S.
In my opinion - stick with the carbons.
Down the road you'll be glad you did, or wishing you had.
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Old 10-30-2018, 08:18 PM   #19
Grits
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Thanks again Rick for the input, you have been a great help.
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Old 11-01-2018, 07:42 AM   #20
BowBuddy2
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Quote:
Originally Posted by Grits View Post
Thanks for the info. What about a 600?


I shoot the 600 out of my 45 lb bow i cut them at 30 inches and tune using the pdf weights with the nock and insert that they screw into, they will fly far and straight, without feathers


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Old 11-01-2018, 07:49 AM   #21
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What are the pdf weights?
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Old 11-01-2018, 07:52 AM   #22
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Quote:
Originally Posted by Grits View Post
What are the pdf weights?


https://www.3riversarchery.com/gold-...ht-system.html


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Old 11-01-2018, 01:47 PM   #23
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Thanks BowBuddy2
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Old 11-01-2018, 08:48 PM   #24
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I'm shooting 600's uncut out of my 45. Use the inserts that came with them (15g I think) and some old Razorheads (145g). When I do my part they fly very very well. To be honest though I built these arrows through trial and error to specifically shoot that broadhead and did the same with the arrows for my heavier bow.

As others have said no chart is 100% correct. It might almost behoove you to pick up a test set and try that.
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Old 11-04-2018, 10:13 AM   #25
styksnstryngs
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Rick, when I use your calculator, I get the following results:
Generic recurve, 43#@28, 3/16 past center with a 12 strand fast flight string
400 spine easton aftermath arrow with 145 head and 18 grain inserts, 2" footing of 18 grains, and average fletching and nock weight.
This arrow tubes perfectly.
Does that sound about right?
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Old 11-04-2018, 10:59 AM   #26
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Quote:
Originally Posted by styksnstryngs View Post
Rick, when I use your calculator, I get the following results:
Generic recurve, 43#@28, 3/16 past center with a 12 strand fast flight string
400 spine easton aftermath arrow with 145 head and 18 grain inserts, 2" footing of 18 grains, and average fletching and nock weight.
This arrow tubes perfectly.
Does that sound about right?
If it tunes perfect, then it's likely right , but it's all also dependent on the length of the arrow to BOP, it's GPI, and the diameter of the shaft.

The aftermath isn't listed in the calculator, so I would have to have all 3 of the above mentioned factors to do an accurate calculation.

Rick
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Old 11-05-2018, 03:54 PM   #27
styksnstryngs
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Quote:
Originally Posted by RickBarbee View Post
If it tunes perfect, then it's likely right , but it's all also dependent on the length of the arrow to BOP, it's GPI, and the diameter of the shaft.

The aftermath isn't listed in the calculator, so I would have to have all 3 of the above mentioned factors to do an accurate calculation.

Rick
The aftermaths are the same shaft as the St exels.
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Old 11-05-2018, 06:35 PM   #28
RickBarbee
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Quote:
Originally Posted by styksnstryngs View Post
The aftermaths are the same shaft as the St exels.
With the bow being cut negative 3/16", and assuming a 1/16" thick strike plate material, the arrow's inside is setting at negative 1/8"

The calculator shows a perfect arrow/bow match up with your specs "IF" the arrow is 31.75" to back of point, and I trust that as being pretty accurate.

So my question is: How long are your arrows to back of point?

Rick
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