There’s also the, umm, Flying Bum[1] descended from a discarded project of the US military. (It’s not quite clear what they wanted to do with it—radio relay for

There’s also the, umm, Flying Bum[1] descended from a discarded project of the US military. (It’s not quite clear what they wanted to do with it—radio relay for ground troops in difficult terrain? mobile command post?) Filling it with helium (expensive and very limited on Earth) feels kind of barbaric, though, knowing what lengths even physics labs go to in order to avoid wasting it. [1] https://en.wikipedia.org/wiki/Hybrid_Air_Vehicles_Airlander_10 https://en.wikipedia.org/wiki/Hybrid_Air_Vehicles_Airlander_...