Hi everyone. I am new here. I have apm 2.6 and 3DR quadcopter x. I finished assemblying and setup arducopter programs to apm 2.6 via missionplanner. At last, i connect to battery and give the throttle. At this point quadcopter don't fly, always pull over. Apm 2.6 controller has to control the quadcopter? What am i missing? Sorry for my bad English.