Its opposing rotors eliminate the need for a tail rotor. This makes the K-Max ... increased precision The K-MAX uses a unique double rotor system where the two rotors cross each other.

It is equipped with a single 4-bladed main rotor and a single 2-bladed tail rotor mounted on the left ... The UH-72A utilizes a twin skid landing gear system. In June of 2006 the United States ...

Lockheed Martin's Sikorsky has successfully flown its "rotor blown wing" drone in both helicopter and fixed-wing flight modes ...