2重反転プロペラ 二重反転プロペラ
Two sets of [[propeller|propellers]], one behind the other, that rotate in opposite directions. This arrangement eliminates the effect of torque.

h4. See also

* [[Coaxial rotors]]
* [[Mecha musume]]
* [[Strike Witches]]
* [[Tu-95]]
* Wikipedia: "Contra-rotating propellers":http://en.wikipedia.org/wiki/Contra-rotating_propellers
contra-rotating propellers