springel -> RE: Crossing the Atlantic on the Hindenburg, 1936 (7/21/2021 6:52:50 PM)
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ORIGINAL: Red_L.E.D. I remember reading about the cargo airships 20 or 30 years ago but nothing has come out of it. I would say that the lightest element (hydrogen) is absolutely necessary to make the airship viable. All later developments have tried to use helium and that is just too heavy to be commercially or practically viable. Helium weighs 4, while hydrogen weighs 2, but air weighs about 15, so the lift of hydrogen versus helium is only 13 : 11, which is a small, non-essential difference. Basically it is not about the weight of the light gas, but of that of the displaced air.
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