Help!!!

[bobogofast]

I am building a twin bobtail design based off the synergy aircraft and have no idea how or where to find any information regarding cg. any information on these style of aircraft would be great. this is my current mock up of a 75% i will build the full size out of balsa

 

[BridgeInspector]

Toss it.

You will need to try throwing it and getting it to glide level. Before installing electronics and battery, just tape weights to it until it glides well. Then where it balances is your CG. Check out the recent video from Mesa Foam fighters or there is an older Flite Test video on finding CG too.

 

[BridgeInspector]

 

[desert wings]

I agree with BridgeInspector...trial and error on this one is probably going to work best.
As a starting point you may be able to use a flying wing calculator (and modify your entries to best fit the shape of your twin bobtail).
See the link below:

http://fwcg.3dzone.dk/

Ultimately I think the glide test while the plane is light (before engine, electronics, battery) is going to be the best. There is less chance of damage if you do this while light.