Contrarotating rotors
I'm working in Kazakhstan and saw a Kamov heli buzzing around yesterday. Funny looking thing with the twin rotors on the same axis. . .. .I understand how a conventional and a NOTAR heli works but how do they turn a machine with no tail rotor. It did have large vertical fins and thus I assume rudders which would work in forward flight but what happens when you want to turn in the hover?. .. .As an aside, I've always it funny that the US machine with a different (read strange) rotor system also begins with a K (Kamen)