You know what dude? I've been having the exact same problem with my FBD. It just nosedives into the ground. I've literally tried everything: bigger prop, more angle on the ele-rudders, battery father aft in the fuselage for a better C of G, everything imaginable. Now, I finally found the problem and solution. Problem: I live in Colorado Springs (6,500 ft) and the air is too thin for the small prop to grab and push off of. I tried it in San Diego and it'll take off from the ground - no throwing needed. So if you live high in altitude, sucks to be you and your FBS! Solution: larger DC motor and propeller for the Firebird II. If you have the money, buy a Commander 2. It is said to fly better here. That's all I can say. Oh, by the way, does anyone know where to get a more powerful engine that fits?