Drones are unmanned aerial vehicles (UAVs) or unmanned aircraft systems (UAS). The drone is a flying robot that can be controlled remotely and works in conjunction with on-board sensors and the Global Positioning System (GPS). Drones use their rotors, which consist of a propeller attached to an engine. - in hovering flight, which means that the downward thrust of the drone is equal to the force of gravity acting against the elevator, when the pilots increase their speed so that the rotors produce an upward force greater than gravity; Get off when the pilots are ahead.