I am trying to figure out how to determine an "equivalent" stiffness for arrow of different static spines, lengths, and point weights. When I say equivalent stiffness, I mean finding an arrow that will tune the same as one of a different static spine, length, and point weight.

My specific situation is this: my indoor line-cutter arrows are aluminum (X7 Eclipse), size 2613 (spine rating 265), 35" long, with a 250gr point. They have tuned up beautifully: perfect bullet holes through paper at multiple distances, and the unfletched ones group with fletched ones at 20 yds. But they weight almost 750 gr, and are only usable indoors.

So now I want to find a much lighter (and therefore faster) arrow and point combination that will tune equally well for outdoors shooting, up to 80yd (70m). My actual proper arrow length is about 30.5, and I'm shooting a compound bow with a release.

Any suggestions for where to look for this kind of calculation? Or even specific spine/length/point combinations that would shoot equivalently?

Hi! I don't know much about bows, and I am trying to figure out what this is so I can look up how much it's worth and sell it or decide to keep it. I hope this kind of post is allowed here; I don't see anything in the rules about that.

I took pictures of the only text I can find on the bow, those pics are attached. It says it's from Carroll's Archery Products with patent number 3.486.495, seems to be for hunting and is colored as such on the inside of the top and bottom wooden parts (camo, vry cute). When I look up that patent info, I don't get much...like I don't know what model this is or the year it was made.

The part you grip is rather roughly textured and I'm not sure what the material is...some kind of plastic or resin? I'm scared to try to draw it because I got it second-hand many years ago and don't trust the string not to snap and take my eye out 😆

Anyway, if anyone recognizes this, or can help me figure out the model, potential value, etc. I would very much appreciate any info :) I may decide to keep it if it's worth getting it restrung.

Very sorry for my ignorance on these things; I'm sure that is annoying, but I appreciate this community being here!