What enables an unmanned aircraft to change airspeed and pressure, thus generating lift?

The ability of an unmanned aircraft to change airspeed and pressure, which in turn generates lift, fundamentally relies on the design and function of its wings or rotors. Wings are specifically designed to create different pressure zones above and below them, utilizing the principles of aerodynamics. When air flows over the curved surface of the wings, it travels faster than the air below, creating lower pressure above the wing and higher pressure below, thereby generating lift.

In the case of rotorcraft, such as helicopters or multi-rotor drones, the rotation of the blades also changes the angle of attack and the speed of the blades through the air, similarly creating lift. The adjustments in airspeed by the aircraft's propulsion system allow the aircraft's wings or rotors to manipulate air pressure effectively, and consequently, generate the necessary lift for flight.

While engines provide the thrust to propel the aircraft and the fuselage and tail fin play roles in stability and control, the direct generation of lift is intrinsically linked to the wings or rotors, making them the crucial components in this process.