Pure steam has almost as much lift as helium, but requires energy input to maintain lift. Electrically excite the steam and you have reaction jets for station keeping.
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https://www.quaternium.com/uas/mining/
All dimensions are metric except it has 30" propellers, so it's about 5ft long. All the proposed uses are observation, the payload is 2.5kg [5.5lb].
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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