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Since every good AHr loves airships let me pose one: how big is the biggest an airship can get?
Postulate at least 100yr of technical development, so skins something like Kevlar, & frames of a "bubbled" steel that's 9x stronger for its weight than anything available now OTL. (So a repop Hindenburg's airframe would be as strong as OTL, but weigh only 10% what it did OTL, with a corresponding increase in payload.)
So, given manipulation of lift capacity (heating/cooling gas cells) & other tricks, & powerful enough engines, what upper limit would airships reach? I'm imagining, eventually, bridge-building techniques start coming into play.
Forget practicality: this is a dream of the biggest jumbo possible.