Drone Pilot Practice Exam

Which of the following best explains the relationship between drag and thrust during a UAS flight?

1. They are always equal

2. Thrust exceeds drag

3. Drag exceeds thrust

4. They vary dependent on flight conditions

The correct answer is: They vary dependent on flight conditions

The relationship between drag and thrust during a UAS (Unmanned Aerial System) flight is characterized by variability, influenced by several factors such as flight speed, altitude, and maneuvering conditions. During different phases of flight—such as takeoff, cruising, or landing—the thrust produced by the UAS's propulsion system and the drag it experiences due to its shape and speed can change significantly. For instance, during takeoff and acceleration, thrust typically exceeds drag to allow the drone to ascend. Conversely, during descent or in situations where the drone is slowly moving forward, drag might exceed thrust, leading to a decrease in speed. In level flight, thrust must counteract drag to maintain a constant speed. Hence, the dynamic nature of flight conditions dictates that these forces are not static but rather vary depending on how the UAS is operating. This understanding is crucial for drone pilots, as managing thrust and recognizing the impact of drag under different flying conditions directly affects the performance and maneuverability of the drone.