Thread: Arrow spine

I've just spent a happy hour testing the spine of all my arrows.
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I used the following as the standard:

Static spine, is how an arrow reacts when an 880-gram (1.94 lbs.) weight is suspended from the centre of the arrow. The arrow must be supported by two points, which are 28” apart. The number of inches the arrow deflects or bends X 1000, due to the weight, is the spine size or measurement of an arrow.

So, a 500 arrow bends .5-inches when the weight is applied.

Wooden arrows (arrow braced at 26 inches with the weight suspended at the 13 inch center) and modern carbon and aluminum arrows (arrow braced at 28 inches with the weight suspended at the 14 inch center).
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What I found was that the 500 spine, cheap arrows I'd bought were much closer to, 1,000 spine.

The 350 spine and 400 spine, also cheap arrows were almost spot on, at 500 spine.

This is fine, whilst I'm still getting proficient, with my bow and form and so on.

I'll be interested later on, when I buy some better quality arrows in NZ to see how accurate their spine is.

Just for interests sake, I now have:

Set A - 1,000 spine approx 550gn

Set B - 1,000 spine approx 350gn

Set C - 500 spine approx 480gn

Set D - 500 spine approx 380gn



...again this stuff is new knowledge to me, I post what I've learned, out of interest.

Maybe it's helpful, to another newbie like me