Reply
Go Back   TexasBowhunter.com Community Discussion Forums > Topics > Traditional
 
Thread Tools Display Modes
Old 11-29-2015, 10:21 AM   #1
M.E.B.
Ten Point
 
M.E.B.'s Avatar
 
Join Date: Nov 2006
Location: TX
Default Gold Tip?

They seem to be labeling these things different now.

400=5575

500--3355

Is that correct?
M.E.B. is offline   Reply With Quote Back To The Top
Old 11-29-2015, 10:26 AM   #2
Bisch
Pope & Young
 
Bisch's Avatar
 
Join Date: Oct 2007
Location: Sonora, Tx
Default

Yes!

.400 spine is 55/75 and .500 spine is 35/55 (although every single GT shaft I have put on a spine tester shows stiffer than what the shaft is labeled).

Unless they changed on the newest ones for 2016, both numbers should be on the shaft.

Bisch

Last edited by Bisch; 11-29-2015 at 10:42 AM.
Bisch is offline   Reply With Quote Back To The Top
Old 11-29-2015, 10:38 AM   #3
M.E.B.
Ten Point
 
M.E.B.'s Avatar
 
Join Date: Nov 2006
Location: TX
Default

Thanks!

I ordered some and saw the 400 on them. I did not open the plastic wrap on them. Maybe the 5575 was on them too and I did not notice.

Last edited by M.E.B.; 11-29-2015 at 10:41 AM.
M.E.B. is offline   Reply With Quote Back To The Top
Old 11-29-2015, 12:04 PM   #4
RickBarbee
Pope & Young
 
RickBarbee's Avatar
 
Join Date: Jul 2008
Location: Texas Back Roads
Hunt In: Where I am
Default

Just an FYI:

The modern manufacturer's deflection ratings are done on the ASTM chart, and derived by checking the deflection on a 28" center with a 1.94# weight.

When spine is checked using the AMO standard (26" center with 2# weight) it will always show a higher spine than the ASTM.

EXAMPLE:
I have some shafts that ASTM spine as .300, and they are dead on.
When checking their spine on a spine tester using the AMO formula, they have a .250 deflection.

To see what the ASTM charts actually are in AMO spine, you can use the conversion formula of ASTM deflection X .825.

Example:
ASTM spine defletion of .300 X .825 = AMO spine deflection of .247

Shafts from different manufacturers, and different materials will vary some, so the conversion formula is not perfect, but it will get you close enough to make accurate shaft selections when viewing the manufacturers spine charts.

Here also is an AMO spine deflection chart.

Hope that helps some.

Rick
Attached Images
 
RickBarbee is offline   Reply With Quote Back To The Top
Old 11-29-2015, 12:46 PM   #5
M.E.B.
Ten Point
 
M.E.B.'s Avatar
 
Join Date: Nov 2006
Location: TX
Default

Why did they change to ASTM? I though that the archery manufactors got together years ago to set a standard so we could compare apples to apples.

My head hurts.
M.E.B. is offline   Reply With Quote Back To The Top
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:14 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1999-2012, TexasBowhunter.com