Quadcopter definitions

(QUAD heliCOPTER) A helicopter with two pairs of rotors (vertically oriented propellers). One pair rotates clockwise; the other counter clockwise, and the flight path is controlled by the speed of each rotor. Manned quadcopters date back to the 1920s; however, consumer models appeared for aerial photography and just plain fun after the turn of the century. See personal drone and insect drone.
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A rotorcraft propelled by four rotors.
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