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Materials Science limit on ship size?

A nautical ship structure has to be able to handle the loads of both sagging, where the bow and stern are supported by waves while the midships is not, and hogging, where the midships section is supported and the bow and stern are not. They also have to deal with the effects of "slamming" where the ship is being driven at speed into a head sea, and the bow is repeatedly slammed into the next wave. The structure also has to be able to support the ship's weight while in dry-dock.

I guess that I do not see any problems designing starships greater than 5000 dTon, using standard high-tensile strength steel, that would be capable of handling 6Gs of acceleration in line with the vessel structure. Now, if you are assuming 6Gs of acceleration against a vessel's side, that might take a bit more work structurally.

I prefer the "small ship" universe, not that I do not think that larger ships cannot be built, but because I am not sure if they are really needed.
 
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