RE Read the story
It won't become suddenly boyaunt... the helium only suports the aircraft, not the load.... that whole nutrual boyancy thing.
Hence why it is a Airship COPTER.... the rotors are used for the extra lift to pickup and set down a load. A hybrid if you will. The idea being your not burning large ammounts of fuel to stay in the air when not carrying cargo, and so that your lift rotors are only used for lifting loads, thus giving you way more lift capacity then a normal heli.
Also as a side note have any of you ever used a crane? you don't just drop the load you set it down, give yourself slack on the line then undo the load. Ecencialy on this Blimb copter, you would set down the load (first by adjusting speed and pitch of rotars, or via the crane depending on the load) refind yor netrual boyancy (by turning off the lift rotors) slack the lines and then unhook and take off.
Biting the hand that feeds IT
