In the case of a helicopter, the object is the rotor blade (airfoil) and the fluid is air. Lift is produced when an air mass is deflected and always acts perpendicular to the resulting relative wind. The airfoil must have a positive AOA to generate positive lift. With an AOA of zero, no lift is generated. A quadcopter can move on 6 different axes. Drag: A rearward retarding force caused by interruption of airflow by the wing, rotor, fuselage, and other protruding objects. The drag opposes the thrust and acts backwards parallel to the relative wind. Weight: The combined load of the aircraft itself, crew, fuel, and cargo or baggage. The weight pushes the plane down due to gravity. It opposes lift and acts vertically downward through the aircraft's center of gravity (CG). Lift: opposes the downward force of weight, is produced by the dynamic effect of the air acting on the airfoil and acts perpendicular to the flight path through the center of lift. Thrust: generated by the rotation of the main rotor system. In a helicopter, thrust can be forward, backward, sideways or vertical. The resulting lift and thrust determine the direction of movement of the helicopter. “Quadrotors operate using a symmetrical design with the rotors positioned in each of the four corners. The rotors are fixed in their pitch with two rotors moving clockwise