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» Trad Gang.com » Main Forums » PowWow » Cx Heritage and Stu arrow spine calculator

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Author Topic: Cx Heritage and Stu arrow spine calculator
mand0ralen
Trad Bowhunter
Member # 21430

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hello,

im perparing a new bunch of arrows, will choose Cx Heritage for their durability (and price ^^).

I will use it for 3d shooting so .. lightest as possible, no heavy inserts and point (10% FOC is ok).

So i started up Stu's awesome excel sheet and begun playing with it:

CE Heritage 075 : shaft model and spine
28,50 arrow lenght back of point
90 gr point weight
11 gr insert
No footing
Nock+wrap=16 gr
5" Feathers
Dynamic arrow spine= 65,9

bow data:
Performance Recurve / Horsebow : bow type
45,0 28,0 : 45@28
27,5 ; my draw lenght
1/ 8 past center
FastFlight 16 strand
Dynamic arrow spine=62.9.

Bow is a Border Black douglas with Hex5 limbs (take a moment to read PeteWard review about this bow, it's a nice piece of equipement).

Will gain the 3 units of spine using a better string (my FF16 is a piece of crap), no problem.

It's just that i dont feel comfortable using a CX 75 that's small ...

So do you have experience with Cx 75 and do you think i might do a wrong calculation ?

Looking forward reading your answer.

++M

Posts: 105 | From: Switzerland | Registered: Sep 2009  |  IP: Logged | Report this post to a Moderator
Old York
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Could you re-post without the formatted info being skewed?

--------------------
"We were arguing about brace-height tuning and then a fistmele broke out"

Posts: 680 | From: Wisconsin | Registered: Dec 2006  |  IP: Logged | Report this post to a Moderator
mand0ralen
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repost !
Posts: 105 | From: Switzerland | Registered: Sep 2009  |  IP: Logged | Report this post to a Moderator
mand0ralen
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no one ?
Posts: 105 | From: Switzerland | Registered: Sep 2009  |  IP: Logged | Report this post to a Moderator
Old York
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Do you have any strike plate material at the arrow pass that would change your actual -1/8" entry?

I came up with the same 65.9 and 62.9 values, if the CE 75 Heritage does have a static deflection of 0.608", seems like your choice should work. I bet that Borrder bow will really spit them out!

--------------------
"We were arguing about brace-height tuning and then a fistmele broke out"

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mand0ralen
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hello,

thanx for your time. My strike plate is very very thin (calf something, i dont remember the word in english.

By the way, Shawn at 3RA, confirmed that i need the 75 beacause the 90 are still .530 !

Will try to tune a doz up and tell you how they match the bow so others can benchmark.

++M

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Old York
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That's calf skin off his chinny-chin-chin, quite thin indeed, hmmmmm. Good luck with your testing, it can be fun.

--------------------
"We were arguing about brace-height tuning and then a fistmele broke out"

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excelpoint
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I got the same numbers as you. If you keep the same string you could go to an arrow length of 28.9" to get it spot on.

--------------------
"A hunt based only on trophies taken falls short of what the ultimate goal should be ... time to commune with your inner soul as you share the outdoors with the birds, animals, and the fish that live there."
Fred Bear

Posts: 401 | From: Melbourne Australia | Registered: Feb 2009  |  IP: Logged | Report this post to a Moderator
   

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