Multirotor helicopters only need simple rotor mechanics for flight control. They use fixed-pitch blades, while single rotor helicopters and double rotor helicopters use complex variable pitch rotors whose pitch varies as the blade rotates for flight stability and control.
Because of simple rotor mechanics, the multirotor aircrafts (mutltcopters) have become more and more popular, and widely used in radio control aircraft projects.
At fpvmodel.com, there are several types of multicopter on hot sale, including tricopters, quadcopters, hexacopters and octocopters.
Free Flight X4 High-end Quadcopter with Retractable
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