Author Topic: Arrow Spine  (Read 3718 times)

0 Members and 1 Guest are viewing this topic.

Offline bigcountry

  • Member
  • Posts: 841
Arrow Spine
« on: June 20, 2008, 10:34:53 pm »
Is this normal.  I am relatively new to the selfbow scene.  I have built one osage and building another.  I also one someone in Wa State built for me.  All of them, I need spines 12lbs or lower than the wieght.  I have to shoot 40-43lb spine POC with 125gr tip with my 54lb osage that is almost centershot.  And have to shoot the same 43-45lb spine out of another one I built that is pretty far from centershot and is 57lb bow.   I also tested out with 1816 alums and need 200gr head with a 30" arrow to shoot well out of my 54lb osage. 

They fly good, don't burn up as far as speed.  But I hit where I am aiming.  I just wonder if I have a bad release or these are typical numbers. 

Westminster, MD

Offline Justin Snyder

  • Administrator
  • Member
  • Posts: 13,794
Re: Arrow Spine
« Reply #1 on: June 21, 2008, 01:26:57 am »
It is actually fairly normal for a long bow to need spine 10# under bow weight. The center shot one should not be as bad.  This tells me that the bow you built is probably a little more efficient. The center shot bow probably has a lower string tension at brace.  Justin
Everything happens for a reason, sometimes the reason is you made a bad decision.


SW Utah