Unmanned aerial vehicle

An unmanned aerial vehicle comprising:

• a main body unit;
• a plurality of propeller motors of which the rotational speed is adjusted by the main body unit;
• supports which extend from the main body unit in order to support the plurality of propeller motors;
• propellers which are axially coupled to the plurality of propeller motors and output thrust;
• and
• tilting units which tilt rotating shafts of the propellers with respect to the main body unit,
• wherein the main body unit includes
• a main body which defines an external appearance;
• a communication module which is provided in the main body and communicates with an external remote controller;
• and
• a control module which is provided in the main body and controls the plurality of propeller motors, the control module further includes a tilt control unit which controls the tilting units,
• wherein the main body unit further includes a horizontality maintaining unit which maintains a horizontal posture of the main body unit when the unmanned aerial vehicle is in the air,
• wherein the horizontality maintaining unit includes
• a flywheel motor which is provided on the main body unit;
• and
• a flywheel which is axially coupled to the flywheel motor,
• wherein in response to detection of a signal, transmitted via the communication module, to move the unmanned aerial vehicle to a certain direction, the control module stops the flywheel motor and rotates the tilting units to tilt one of the tilt rotating shafts of one of the propellers with respect to the main body unit, and wherein
• in response to detection of a signal to stop the unmanned aerial vehicle, the control module operates the flywheel motor to maintain the unmanned aerial vehicle in a horizontal direction.