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Woah, this is already reality?! I remember seeing a very similar prototype on the cover of Popular Science in 2012, and I was jizzed to see a chopper without the tail rotor. Thank you so much for bringing this to my attention!

Here's the concept:
http://www.dailymotion.com/video/x1212c7_2012-invention-awards-the-noreaster-helicopter-engine_tech

http://www.wpi.edu/Pubs/E-project/Available/E-project-042512-143139/unrestricted/Modeling_the_NorEaster_Engine.pdf

^that's the NorEaster engine. It's pretty nice, and you MUST check it out. I haven't read the pdf because its ~80 pages, but you'll probably find it useful...

Ah, but that's not entirely what the kmax is. It uses intermeshing rotors, not coaxial. It results in extreme efficiency with lowered complexity and higher maneuverability, also losing less power due to coaxial "downwash". Intermeshing was first done by the Germans in the 40s, and the kmax is the most recent

Oh boy intermeshing is scary! If one of those 2 motors screw up, you're SCREWED. So why isn't this tech used more?

p.s. the kmax is one of the most awkward looking choppers I've seen. Granted, the intermeshing is cool, but the nose cone, ugh, that doesn't look like it belongs there at all.

and lol the way the kmax dumped that SUV

Yeah! Whereas two rotors on top of each other hovers, it covers less surface area. Because of the skewed angles, intermeshing makes you take crazy turns. And there's no way for the blades to collide, because they run off one gearshaft that splits it's power.

That makes sense, I should've guessed the common gearshaft :P But, why isn't this tech used more?

and by micro UAV, do you mean the amazon-esque kind of UAVs?

No...smaller http://www.avinc.com/nano

Why aren't intermeshing rotors used? Because people are SILLY

cute micro UAVs :)
i also read that intermeshing is superior to a coaxial system. MAKE A SUPERSONIC COAXIAL ROTORCRAFT FOR ME PLS!!

there's not even a supersonic copter yet...