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..But these thing don't normally just float up in the air and tour around for thousands of miles. So what is it's power source...and how does it stay aloft without either Balloon or wings?"
When I said the above, I was thinking about the flying tin can. I ran into a video by CNN, wherein they said the pilots who shot it down were also puzzled with it's propulsion system.
A cylinder no bigger than a small car, especially if mounted on a rigid, cylindrical frame..could not carry much payload; probably not enough to support itself.
Then a propulsion unit and it's added weight.....?