My thinking here is that if my rigid airship body is, say, 24g, with vacuum, why would it float with helium or hydrogen inside, when they have mass and thus weight? Makes very little sense, unless it has something to do with the density?
I haven’t actually done this yet, and I’m working out ideas for one. Everyone I know tells me I’m wrong for thinking a vacuum (assuming a full one, although they are elusive) would float over helium or hydrogen.
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You can’t make a ridig airship with helium without greatly reducing the payload size. It’s too heavy. A blimp has a soft shell to reduce the weight. You can’t fill one with vacuum because the difference in pressure on the outside vs the inside would be so great that anything you build strong enough to withstand that pressure would be too heavy to be buoyant in the air. In order to float, you need to displace more mass in your volume than the fluid you displace. Lighter than air flight literally requires you to be lighter than air.
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