They have got a radio system integrated but at these sizes a high power/size radio and antenna would be impossible. GPS (although tiny now) would represent about half the board space.
If they have them equipped with some kind of wireless gear (think xbee) and GPS, they could be easily airdropped en masse over zones of interest and work in a swarm, covering huge areas, pushing data from sensors through the mesh back to HQ and self destruct when their work is done.
That circuit board looks amazing! I like the way that there are minimal individual parts and assembly consists of inserting and soldering the motors. These could be made quite affordable. Another thing that I like is that the parts are such high quality, none of that cheap stuff. I can't wait to see a video.
What I see the most amazing is how simple its production is. Just manufacture the PCB board and mount 4 motors. Thousands of these can be produced by a small company within a day.
Alex, with three rotors you'd need to add a 1 DOF rotary joint with a servo... not sure if that would be lighter than just using 4 rotors on a flat board.
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