Jisho

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交差反転式
Wikipedia definition
1. Intermeshing rotorsIntermeshing rotors on a helicopter are a set of two rotors turning in opposite directions, with each rotor mast mounted on the helicopter with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The arrangement allows the helicopter to function without the need for a tail rotor. This configuration is sometimes referred to as a synchropter.
Read “Intermeshing rotors” on English Wikipedia
Read “交差反転式ローター” on Japanese Wikipedia
Read “Intermeshing rotors” on DBpedia

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