> About 80 cubic meters of helium. This doesn't add up since you get ~1 kg per cubic meter. That design is an inflatable plane. https://www.guinnessworldreco

> About 80 cubic meters of helium. This doesn't add up since you get ~1 kg per cubic meter. That design is an inflatable plane. https://www.guinnessworldrecords.com/world-records/443025-smallest-airship https://www.guinnessworldrecords.com/world-records/443025-sm... - "The particular design of the envelope creates lift as well as buoyancy, which allows the envelope to be smaller than if it solely relied on buoyancy to keep the craft aloft" Maybe with a small kid and a high tech envelope and hydrogen which is ~ 1.1kg. It would be impressive to get to 80 cubic meters. [edit] Those aéroplumes are fucking cool in the comment above. They are 110 cubic meters. They also fly them in caves - https://www.youtube.com/watch?v=07Cp_NfdLbE https://www.youtube.com/watch?v=07Cp_NfdLbE