Arrow spine questions

[Stump73]

I'm confused about arrow splines. I was 3 rivers arrow charts looking at the wood arrows, the arrows for me are 40-45. Is that  saying they are splined for bows with draw weights of 40 to 45 #'s? Because I've seen on **** and other dealers saying the arrows are splined at 65# is that for a 65 pound draw weight? Also what is a 3555 cabon arrow splined at?  Thanks Mike

[maineac]

There are others who will be able to give you much better information than myself.  But the basic idea is that an arrow's spine is measurement of its stiffness.  The more powerful a bow (draw weight) the stiffer and arrow it will require to fly correctly.  It is measured by how far much the arrow bends with a specific amount of weight applied at its center of a specific span.

Many carbon arrows have a spine that can cover a wider range of bow weight.  3555 would potentially cover bows of that variety of weight.  The arrows spine can be altered by shortening the arrow which will make it stiffer.  Or adding weight to  the front of the arrow (tip) that will make it weaker.

How a bow is constructed, no cut out in the riser for the arrow, to a rest that is cut past the center point of the bow will affect how stiff and arrow the bow needs.

Hopefully I have not made the water any muddier for you.

[RightTrailWrongTime]

Well gosh there's a lot that goes into chosing the correct arrow spine like, type of bow, weight at your draw, arrow length, desired point weight, ke factor, front of center, what your intentions are etc.. try this, use the search function above and your will discover a ton of info, if you're still confused after reading then I'll be glad to help you out. Carbon 3555 actual spine depends on length but simply put 35-55 pounds without getting to technical. Hope this helps.

[rastaman]

spine....not spline.      

Spine: Spine is probably the most important part of the arrow shaft and the most ignored. I presume the main reason for this is because it is the hardest for a manufacturer to get right and keep consistent. Also, it is one that cannot be measured very easily by the average person. Let's determine what spine is and do not confuse it with spline! Spline is what the fishing industry uses in order to get sort of the "back bone" of the fishing rod. This is sort of an overlap of material in order to get the stiffer side. Keeping this stiff side on the upper side makes it easier to handle when reeling in that big one! In archery you do not want a spline! You want an even consistent spine all the way around the shaft (circumferentially). Spine was established in modern times by Easton who uses a 29" arrow. You place this arrow on two posts measured out 28" apart. You then place a 1.94 pound weight in the middle of the shaft and measure how far the arrow shaft drops down. This gives you a static (non-moving) spine.

[Stump73]

Thanks for the correction Randy.

[RightTrailWrongTime]

"circumferentially" that is the biggest word I have seen all day! I love this place, good info above.