Hello, I am building a canard glider of my own design. I thought such a thing does not exist, untill I read your post. Gliders are a little different than powered planes, but I have someideas. The simplest way to find center of gravity is drop the plane from maybe 8 feet or so unto a cusion and the nose should drop first. But the nose should not drop to much. A glider will lose a lot of altitude with the nose being too heavy, but I think a powered plane will not have this problem as much as a glider. If you are off center of gravity ina powered model it would be better to be forward, then move back in small increments untill correct attitude is found. I have a nitro1.2 Spitfier and with the COG too far back on it's maiden flight is was something just to get it down in one peice.