I have been playing with the Archery Program for the past few days and it seems pretty cool so far. You can download for a 15 day free trial. I think I am going to buy it. I can't vouche for it's accuracy, but it is fun to play with.

It actually has most of the bows available right now in a data base with the specs and effeciency ratings. It uses these specs(mostly the effeciency rating) to figure spine for that particular bow. It also lists most of the popular arrows out right now. You enter what arrow length you want to use, your draw length, tip weight, and fletch weight and it will tell you if it spines correctly or will pick arrows that do.

It also calculates ballistics, sight tapes and other stuff. From what I can tell most of it seems to be pretty close. I would guess the owner visits this site, if not I know he does on Eders.

This is the site for the program: http://www.thearcheryprogram.com/index.html

If for some reason this does not post, or I was not allowed to do it, email me at [email protected] and I will give you the link that way. It takes alot of the guess work out of picking the right arrow and it will let you see what minute changes in your set up will do to spine and arrow trajectory. I know of other programs that will do some of this, but it is very cool to have the all the bows specs built into the program. You could aslo use it to shop for a new bow. It would be a very good way to compare performance from bow to bow. I do think my bow shoots a little faster than it says it does, but everything else seems to be accurate. I could be using it wrong also. But the spine calcalculator is very easy to use and figure out.

Paul