Sorry for not searching but this site is slow on my phone...
Story, my boss has a Zagi glider ( no motor) and we tried it out the other day and it needed full up elevator to keep it from diving straight down. I know only a little about planes and less about ones without a tail and even less about gliders. So a quick question, where is the CGsupposed to be? I think he said the book put it at 7" from the tip.
Let me go find the box so I can give the model or size, whatever.

Enter the measurements of the Zagi in here: http://fwcg.3dzone.dk/

Since it's a glider, I'd suggest using the 20% value instead of the 15% since gliders prefer to be a bit tail heavy.

BTW, that link is posted in a stickied thread on the "Flying Wings" forum in the electric airplanes section.

Thanks for the help...I'm still learning my way around this forum.

Way too nose heavy. Try moving the CG back to 7.75"- 8" back from the nose, and reduce the control throws.

Also, when you get it flying, you'll need about half the elevator throws -vs- aileron throws.

Learn to throw it with your four fingers under the nose, and your thumb on top. You can actually get a pretty decent throw this way.

Or tape a clear servo blister package on the bottom as a handle and pushoff.