Multirotor

A multirotor or multicopter is a rotorcraft with more than two lift-generating rotors separated horizontally. An advantage of multirotor aircraft is the simpler rotor mechanics required for flight control. Unlike single- and double-rotor helicopters which use complex variable pitch rotors whose pitch varies as the blade rotates for flight stability and control, multirotors often use fixed-pitch blades.

They control vehicle motion by varying the relative speed of each rotor to change the thrust and torque produced by each.
Some control the pitch of each rotor instead.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

THOPTER

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