3 ms·
Why not use liquid oxygen as the phase change liquid? Then the gas could be caught in a bladder tethered to the ground. When it comes time to ascend, use it as
by stcredzero 7y ago
Why not use liquid oxygen as the phase change liquid? Then the gas could be caught in a bladder tethered to the ground. When it comes time to ascend, use it as a balloon?
There must be some way to exploit the temperature difference between the surface and 50km up, without mega-engineering.