单词	quadcopter
释义	quadcopter quad·cop·ter Q5006975 (kwŏd′kŏp′tər)n. A drone or other aircraft that derives its lift from four vertically-oriented rotors. [quad(ri-) + (heli)copter.] quadcopter quadcopter (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. A Micro Quadcopter Designed for pure entertainment, the QUARK from Rooftop Brands is charged via USB. The unit takes off vertically and flies by the speed of the rotors, which is controlled by a remote control with two AAA batteries.
随便看	fphlcc fphlm fphm double-beddedly double beef and bacon double-bellied double-bellied baluster double below elbow double below knee double bend double-bend fitting double beta decay double beta minus decay double-beveled edge double-bevel groove weld double bill double-bill double bills double bind double-bind double binds double biopsy double birdie double bit error double bit error detecting

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