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A comment on The US military is testing stratospheric balloons that never have to come down. Parent comment

Re:The US military is testing stratospheric balloons that ne... by 14 on Friday November 16, 2018 @12:41PM (#18470313)
Or perhaps some sort of venting system that engages at a certain altitude or pressure preventing the ballon from over expanding. Like a hot water tank has a pressure release it the tank gets too hot will vent releasing pressure.
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Re:The US military is testing stratospheric balloons that ne... by londons_explore on Saturday November 17, 2018 @03:06AM (#18474553)
Venting does not work. For a given altitude, there is no amount of helium which will make your craft stable unless the volume of your craft is non-linear with pressure (usually done by having something that stretches to a limit, and then cannot stretch further)
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Re:The US military is testing stratospheric balloons that ne... by FlyMoreRockets on Friday November 16, 2018 @02:02PM (#18471076)
Or just use zero pressure balloons.

https://sites.wff.nasa.gov/code820/spb_differences_between_z...

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