I'm a beginner on the CX2. I had a crash, and replaced the landing gear, upper lower blades, the main inner gear and the body. I took it for a 10 min flight and everything went well. The next day when I try to fly, it would'nt get of the ground. I thought it may be the battery, so I replaced it with a spare I have. The cx2 still will not lift. I gave it full throttle, I felt the wind strong coming from the cx2< the motors sound strong. I dont know what is the problem. Can someone tell me what may be the problem.