What causes a stall in an unmanned aircraft?

A stall in an unmanned aircraft occurs when the aircraft exceeds the critical angle of attack. The critical angle of attack is the angle between the wing's chord line and the oncoming airflow at which the wing can no longer generate sufficient lift. When the angle of attack exceeds this critical point, airflow separates from the wing surface, leading to a dramatic decrease in lift and potentially causing the aircraft to lose altitude rapidly. This phenomenon is independent of the aircraft's weight, fuel levels, or altitude; rather, it is directly related to how the wings interact with the air as the pilot maneuvers the aircraft.

Understanding the critical angle of attack is crucial for maintaining controlled flight and avoiding situations that can lead to a stall. Proper training and awareness of this concept can help remote pilots make more informed decisions and maneuver their aircraft safely.