A quadcopter is also called a quadrotor helicopter or quadrotor. The quadcopters are classified as rotorcraft, as opposed to fixed-wing aircraft because their life is generated by a set of the rotor. Quadcopters generally use two pairs of identical fixed pitched propellers; two clockwise (CW) and two counterclockwise (CCW). These use independent variation of the speed of each rotor to achieve control. By changing the speed of each rotor it is possible to specifically generate a desired total thrust; locate for the center of thrust both laterally and longitudinally, and to create a desired total torque, or turning force. Fig.1 Quadcopter Drone Quadcopters differ from conventional helicopters, which use rotors that can vary the pitch of their blades dynamically as they move around the rotor hub. In the early days of flight, quadcopters (then referred to either as 'quad rotors' or simply as 'helicopters') were seen as possible solutions to some of the persistent problem...