This machine appears to have its CG close to its geometric center. To be stable in normal, translational flight, like a regular airplane, it needs to have its CG ahead of about 25% of the mean aerodynamic chord, unless you have active stabilization by gyros and very fast servos, and it also needs a vertical tail, unless it has active yaw stabilization spoilers as on the Stealth Bomber. Otherwise, just stick to hovering and very slow flight, and have fun.