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Main Boards => PowWow => Topic started by: eric-thor on June 23, 2010, 03:44:00 PM

Title: double shaft spine?
Post by: eric-thor on June 23, 2010, 03:44:00 PM
anybody have an idea what a 2514 filled with a 2216 would spine out to . im looking for a log for a log thrower 100+ lb bow.  :bigsmyl:
Title: Re: double shaft spine?
Post by: Old York on June 23, 2010, 04:27:00 PM
I'm coming up with 187 pounds static spine, now that's provided the shafts have practically an interference fit, i.o.w., t-i-g-h-t!
Title: Re: double shaft spine?
Post by: eric-thor on June 23, 2010, 04:33:00 PM
they r a nice vacume forming fit not to tight to force in or out but a better fit than the 2117 for sure. wow thats alot of spine !!!!did u actually put the combination on a spine tester or use some form of ccalculation?
Title: Re: double shaft spine?
Post by: Raging Water on June 23, 2010, 05:00:00 PM
Eric,

I am really interested in the answers.

But, why do I think this post is about me? LOL
Title: Re: double shaft spine?
Post by: eric-thor on June 23, 2010, 05:01:00 PM
:bigsmyl:
Title: Re: double shaft spine?
Post by: eric-thor on June 23, 2010, 05:02:00 PM
im putting something together for my friend...

but dont tell anyone its a secret.  :dunno:
Title: Re: double shaft spine?
Post by: WESTBROOK on June 23, 2010, 06:27:00 PM
A 2219, 29", 125g pt has a dynamic spine of #107.5

A 2419 has a dynamic spine of #140.9

Eric
Title: Re: double shaft spine?
Post by: lpcjon2 on June 23, 2010, 07:13:00 PM
Save yourself time and just use a piece of re-bar.
Title: Re: double shaft spine?
Post by: eric-thor on June 23, 2010, 09:52:00 PM
ok thanks
Title: Re: double shaft spine?
Post by: Lucas K on June 23, 2010, 11:47:00 PM
Easton used to make a 2440 shaft, that would be close to what you are describing
Title: Re: double shaft spine?
Post by: Looper on June 24, 2010, 03:46:00 AM
If you use a 30" gt7595, a 8" sleeve of 2216, a 300 grain point, and a 200 grain insert, you come out with an arrow that spines around 125# and weighs around 950gr. You could adjust the spine up or down by changing the length of the sleeve.

I guess it wouldn't be too hard to create a 200 grain insert.

The FOC would be around 29%.