A quadcopter, also called a quadrotor helicopter or q... - dofaq.co
quadcopter

A quadcopter, also called a quadrotor helicopter or q...

wikipedia - 30 Jul 2015
A quadcopter, also called a quadrotor helicopter or quadrotor, is a multirotor helicopter that is lifted and propelled by four rotors. Quadcopters are classified as rotorcraft, as opposed to fixed-wing aircraft, because their lift is generated by a set of rotors (vertically oriented propellers).

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