What are the four forces acting on a UAS?

The four forces acting on a UAS (Unmanned Aircraft System) are Lift, Drag, Thrust, and Weight. Understanding these forces is crucial for the operation and control of a UAS.

Lift is the upward force that enables the UAS to rise and stay in the air. It is generated primarily by the wings of the UAS as air flows over and under them, counteracting the downward force of weight.

Drag is the force that opposes the forward motion of the UAS, acting horizontally against the aircraft as it moves through the air. It is a result of air resistance and can significantly affect the efficiency and speed of the UAS.

Thrust is the force that propels the UAS forward, generated by the engines or motors. It must be sufficient to overcome drag for the UAS to gain speed and maneuver effectively.

Weight is the force due to gravity acting on the UAS, pulling it downward. The balance between weight and lift is vital for maintaining altitude.

While other options may include terms related to aerodynamics or flight mechanics, none of them combine the four primary forces in flight as accurately as Lift, Drag, Thrust, and Weight. This combination is fundamental to understanding how a UAS operates and is