What is the highest pressure possible today?
I have a sketchy idea of using a weather balloon with the lightest possible pressure vessel that can pack as much helium as possible and would like some pointers on where to lookup to.
Is it possible to have a weather balloon liftoff with a composite pressure vessel dynamically controlling/adjusting the gas ? What would be the ideal pressure vessel in terms of highest pressure possible? Weight of the vessel plus pumping the gas back in the cylinder in flight? Is it doable?
some numbers please