ok, ive tried the ontarget2 and dont really understand it. so if anyone can help me answer, is my arrow spine ok? Im shooting:
06 bowtech tribute 61# 26 1/2" draw, using 27" CX terminator lite select 4560, 100 gr. head.
If you can help please do. Thanks.

According to OT2 that arrow is severely overspined. To get into the green zone you would have to shoot Carbon Express CX medallion with a spine rating of .464 or the CX 3D Select in the same spine. Even upping your point weight to 150 those arrows were still overspined.

Are any of these computer programs that you guys are using to check spine, etc. free? Where do you get them? Thanks.

They are not free but they do offer demo models. I beleive OnTarget and TAP both offer a demo model. And Ontarget was like 25 bucks to upgrade when I did it. And that was the full version, just the spine selector is cheaper than that I think.

Paul

what is "overspined" and what can i expect?

archer2 ive messed around on OT2 and it seems that if i take off my string silencers or even put less heavy ones on that these arrows will be closer to green, its in yellow instead of red. does this sound right to you. also i changed the sight, fletchings, peep weight, and nock weight to what i currently have and it somehow made a dramatic difference in my approprate spine, except for spothogg they didnt have the right on, only the hoggernaut but i figured close enough.

With the OnTarget program you need to shoot an arrow through a crono to give it a manually obtained speed, which you use to adjust the calculated speed to match. Without doing this, the results are worthless.