This helicopter has dual-crossing rotors for increased precision The K-MAX uses a unique double rotor system where the two rotors cross each other. Kaman Aerospace calls these "intermeshing rotors." ...

The design is aimed at the U.S. Marine Corps, for which Kaman previously developed an optionally crewed version of its K-Max ...

You can observe this design on K-MAX helicopters, developed by Kaman Aerospace Company. Instead of just one main rotor, there are two, and they spin opposite each other to create lift for K-MAX ...