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A comment on MIT’s gas-powered drone is able to stay in the air for five days at a time. Parent comment

Re:MIT’s gas-powered drone is able to stay in the air for fi... by teraflop on Tuesday June 27, 2017 @05:21PM (#14649568)
It's not even an issue of how much helium is needed; no amount of helium will make a typical suitcase buoyant.

Filling it with helium at ambient pressure wouldn't produce nearly enough lift, and increasing the pressure would make it heavier, not lighter. What's needed is not mass, but volume.

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Re:MIT’s gas-powered drone is able to stay in the air for fi... by Sohcahtoa82 on Tuesday June 27, 2017 @07:26PM (#14650514)
I feel like you're being deliberately obtuse. I think jianshen meant how big of a helium balloon you'd need, not how much helium you'd have to put inside the suit case.
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