[Guardian]

speaking of, I've done some research, and yeah because of how hydrogen fuel cells work I had a great idea for a long durration quadrocopter.. what if I powered it with a fuel cell, and boosted the initial lifting capacity by using hydrogen baloons that double as it's fuel tank, that way you can haul stuff up somewhere, and still have 90 min once they run out and the thing switches to battery.

for use in something like a construction drone.

Patent that. Make it happen!