I doubt these would be multi-rotors as opposed to helicopters or planes. If you read a little about "actuator disk theory" it shows that small rotors are much

I doubt these would be multi-rotors as opposed to helicopters or planes. If you read a little about "actuator disk theory" it shows that small rotors are much less efficient than large ones, and if you're lifting heavy weights that becomes even more important. http://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node86.html http://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/...