This is going to be interesting considering how thin the Martian atmosphere is. I wonder what they are planning to use as a power source/ Probably electric but if so then it is going to have very limited life use unless they have figured out how it will be recharged. Might be OK if used in conjunction with manned missions so it can be plugged in when the battery is drained other wise possibly the top surface of the blades could be solar cells which may add some range to the flight time and allow it to recharge while grounded. Otherwise does an ultra lightweight nuclear power pack exist yet?