Weight vs. Spine
04-01-2004, 10:45 AM
#1
Boone & Crockett
Thread Starter
Join Date: Feb 2003
Location: Lehigh County PA USA
Posts: 12,157
Weight vs. Spine
On a post on a different forum a gentleman made the comment that the stiffness of the arrow's spine and not the mass weight of the arrow is what determines how much energy is imparted into it by the bow.
What are everyone's thoughts on this comment?
What are everyone's thoughts on this comment?
04-01-2004, 10:58 AM
#2
Giant Nontypical
Join Date: Feb 2003
Posts: 9,175
RE: Weight vs. Spine
PHHHBBBBBTTT![8D]
There is nothing in the KE or momentum formulas that takes stiffness into account.
However, he does have a point. An arrow that's underspined will not absorb as much energy from the bow, because some of that bow's energy will be used up by making the arrow flex. It will also enounter more wind resistance as it worms around in the air before it stabilizes, which bleeds off some of the energy it does take from the bow. Not to mention terrible accuracy.
An overly stiff arrow will not flex as much and it will stabilize sooner, which will give it better energy than the underspined arrow. But, again, accuracy becomes an issue.
There is nothing in the KE or momentum formulas that takes stiffness into account.
However, he does have a point. An arrow that's underspined will not absorb as much energy from the bow, because some of that bow's energy will be used up by making the arrow flex. It will also enounter more wind resistance as it worms around in the air before it stabilizes, which bleeds off some of the energy it does take from the bow. Not to mention terrible accuracy.
An overly stiff arrow will not flex as much and it will stabilize sooner, which will give it better energy than the underspined arrow. But, again, accuracy becomes an issue.
04-01-2004, 11:40 AM
#4
Boone & Crockett
Thread Starter
Join Date: Feb 2003
Location: Lehigh County PA USA
Posts: 12,157
RE: Weight vs. Spine
Thanks for the comments guys. My thoughts exactly but I needed to hear someone else say it. 
Arthur,
I had you in mind when I posted this because the arrows that were being discussed were those 5 grains per inch shafts that High Country has been promoting.
Arthur,
I had you in mind when I posted this because the arrows that were being discussed were those 5 grains per inch shafts that High Country has been promoting.
04-01-2004, 02:24 PM
#7
Join Date: Mar 2004
Location: West CO
Posts: 941
RE: Weight vs. Spine
ORIGINAL: ewolf
The stiffer the arrow the more energy it is going to have. The heavier the arrow the more intial energy it will have. Yes stiffness is not in the KE equation, but it does matter.
The stiffer the arrow the more energy it is going to have. The heavier the arrow the more intial energy it will have. Yes stiffness is not in the KE equation, but it does matter.
