Lift Bags are the numerous, [around 20], plastic cylinders, which contain hydrogen and are arranged within the Skyboat’s aerodynamic plastic skin envelope. The polymeric composition of plastic gas proof food wrappers is fairly techni adidas gazelle cal but let’s tackle it now, on this page. Food packaging is a big industry that has made progress with cheap plastic gas barriers. We cannot buy fancy spac adidas gazelle e suit material to keep the lift gas inside the Skyboat.
Lift Bags may measure 4 X 10 feet, flat, which are commercially available as tubes that may be cut to best length. They are available in polyurethane or polyethylene.
One type of effective gas proof plastic film is EVAL, ethylene vinyl acohol. It is stretched during manufacture to close its pores and then mated with the polyurethane base film.
Think food packages. They are tough and strong and gas proof for oxygen and water vapor, at least. Research is needed on how they will perform with H2. The good news is that H2 comes in pairs of atoms and therefor H2 is a larger molecule than the tiny He atom and that gives us one design advantage, we don’t need such a gas tight fabric as helium ballooners would need.
Bags maybe can contain oxy adidas gazelle gen absorber pellets for safety, keeping the O2/H2 ratio below the ignition ratio for long periods. Also, silica gel pellets might be wothwhile to abso adidas gazelle rb moisture inside the bags? I don’t know