two rotors turn clockwise and two counter-clockwise.
* More than four rotors. Referred to generally as multirotors, or sometimes individually as hexacopters and octocopter, these configurations typically have matched sets of rotors turning in opposite directions. They are uncommon in full-size manned aircraft but are popular for unmanned aerial vehicles (UAVs).

Stopped rotors

Some rotary wing aircraft are designed to stop the rotor for forward

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