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What, in your opinion, is the best lifting gas for an ultralight airship? I personally think hot air is the best choice to lift an airship, here's why:
1) Helium is to expensive to buy. Plus it is running out on Earth.
2) Hydrogen is very dangerous. Eventhough it is cheap to make, it still can be highly explosive. We don't want another Hindenburg on our hands!
Blimp'n ain't easy