this post was submitted on 28 Mar 2025
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Any amount of water contact introduces a fair amount of drag. There may be an ideal point somewhere in the middle, but I think if you take this to it's natural conclusion you get a zeppelin.
I did a little bit of math and I think that to lift the payload capacity (including fuel and crew) of a modern day Panama canal ship you would need about a tenth of the peak U.S. helium reserve (a cube about half a kilometer long on each edge, about 1.3x longer than the long dimension of the ship)
I don't think you'd get the best fuel efficiency going upwind lol
Anything smaller would come with proportionally less downsides and at least proportionally less benefits. I doubt it could ever be a net positive in any useful metric.
Hydrogen for sure. Partial lift for a boat has a lot of applications. Much more cargo than an airship, with no complications in flying empty. A fairly flat triangular "balloon" can be used as a solar platform, a sail, and be put in neutral wind mode down to the deck.