AMO Static Spine ?

[anw0625]

How do you find the AMO Static spine of a arrow?  I have looked at Stu's instructions and so one and just making sure that I am correct.
Ex on a .400 spine arrow
Thanks Guys!

[JRY309]

Carbon and aluminum arrows are measured on 28" centers for their static spine.Wood is measured on 26" centers.What do you mean by AMO static spine? I have heard of AMO used for a bows length but not for arrows.

[stringstretcher]

Take any ASTM spine number and divide that by .825 will give you the actual AMO spine

"They report spine numbers based on an ASTM standard using 1.94# @ 28” centers.
Convert ATSM spine to AMO spine by dividing by 0.825."

So your .400 divided by .825 gives you .48484848484 lbs amo spine or 48 lbs.

[Orion]

Huh? Your conversion gives you a .48 deflection, which is equal to a 65# spine.  A .400 deflection using a 2# weight at 26 inches also spine 65#.  

On the other hand, the numbers written on carbon arrows may or may not reflect the true deflection/spine.  I have some Easton Axis N fused with the number 400 written on them that spine 80#.  My Gold Tip 55/75s actually spine 85#. Go figure.  

[stringstretcher]

Sorry for the typo, but you are right. That number is the amo deflection number, not pounds.

[WESTBROOK]

.400 spine should be 78.8#

use the yellow box on Stu's calc.

Eric