Spine or stiffness
 

What impact does this have on arrow performance? Is it more of a longbow performance thing?

RE: Spine or stiffness
 

Define performance.

RE: Spine or stiffness
 

Accuracy, penetration, easy to work with when building arrows. . .

RE: Spine or stiffness
 

If you are working within a manufacturer's specified range of arrow stiffness the for hunting your requirements will be met and exceeded.
It is easy enough to bare shaft tune so start with the heaviest most stiff shaft.

RE: Spine or stiffness
 

I'm sorry, I'm just not getting it. . .

As a performance requirement, I should have also said arrow velocity.

I still don't get how Spine, or bending stiffness affects an arrows performance.

RE: Spine or stiffness
 

When an arrow leaves the bow it oscillates, flexes back and fourth rapidly. The "spine" will determine how fast that oscillation can be brought under control or weather it will have a negative effect on the flight characteristics.