Sooo, when you run out of fuel, how do you pull to the
shoulder?
Imagine everyone has a car and the whole world was paved...
So 9000 feet and 100 MPH? It looks like the props are powered by electric motors? Unless it uses a devilishly long extension cord, flight duration is going to be limited by battery capacity.
It's the same problem designers face with producing a reasonable electric car. Mediocre performance = more power = bigger battery = more weight = further compromised performance. I expect there is a "sweet spot" in there somewhere, but it's going to be a function of payload weight.
Nice toy though...
Regards,
GtG