The Dragon Dream is "half the size" of the latest model, which may not be a good benchmark. The largest airship aeros is building is quite a lot larger: > And

The Dragon Dream is "half the size" of the latest model, which may not be a good benchmark. The largest airship aeros is building is quite a lot larger: > And the ML86X will be nine hundred and twenty feet (nearly three football fields) long, two hundred and fifteen feet (more than the Tower of Pisa) high, three hundred and fifty-five feet (two Boeing 747s) wide, and able to carry five hundred tons. That's 8.329×10^6 m^3 [1] each. That five hundred tons, by the way, is on the order which the logistics expert quoted claimed would be required for airships to be viable. So instead of 1000 dragon dreams, that's 2 ML86Xs. But before total helium depletion is a problem, this whole venture is predicated on airships providing cost-effective transport when compared to planes -- that seems unlikely to hold up if helium prices rise thanks to the proliferation of mammoth airships like this one. [1] http://www.wolframalpha.com/input/?i=(4%2F3)+*+pi+*++920+*+215+*+355+cubic+feet+in+litres http://www.wolframalpha.com/input/?i=(4%2F3)+*+pi+*++920+*+2...