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A quadcopter is a type of helicopter with four rotors.


Low-cost commercial quadcopters generally use electric DC motors such as

Flight Control

Two rotors are spinning clockwise (CW) and two counterclockwise (CCW) to balance the angular momentum. Each rotor produces both lift and torque about its center of rotation, as well as drag opposite to the vehicle’s direction of flight. Flight control is provided by independent variation of the speed and hence lift and torque of each rotor.

Top view of a conceptual quadcopter model.