If anyone is building one of these monoculps, I have learned two things. First of all, if you lift the plane by the wingtips, without the struts, there IS a lot of sag. I would NOT fly this plane without the struts being in place. Secondly, the CG point was unclear to me, according to the manual. I tore my first monoculp up because I measured from the leading edge of the wing, at the fuselage, and the plane actually was way tail heavy this way. This is when it took 8 ounces to balance it, at this point. When I rebuilt the airplane, I put two elevator servos and the rudder servo in the tail. With my batteries right under the the end of the fuel tank, mounted on the floor, with a DLE20 w/17X8 Xoar prop, I have no lead in the plane now, and it flies and lands great. The CG is actually 1/4" in front of the wingtube, at the fuselage. If you're measuring from the leading edge of the wing, at the fuse, it's about 3 3/4" back. The rudder on this plane has a lot of authority. It also has a very slow roll rate, so don't be afraid to put some aileron movement in it!