Page lacks info. Here is info I wrote for wikipedia:

The V-50 was an armed tandem-rotor transport helicopter project from Kamov, with a projected speed of 400km/h. The project was abandoned in the late 1960s and only a model exists.

http://en.wikipedia.org/wiki/Kamov_V-50

The blades can never hit; one rotor turns in the opposite direction. They can occupy the same plane (some actually do) without interference. Counter-rotating blades also cancel the torque reaction that usually requires a tail-rotor. Even twin engine designs like Mi-12 and V-22 Osprey have linked rotors.

Actually the blades are lifted in flight and are set to a specific angle so as not to hit

it looks like the blades will hit each other