Most things in engineering can’t just be scaled like that. Square cube law, material properties, etc. as others have said. You can ask why we don’t just dye cast cars from zinc like scaled Matchbox cars? Those little toy cars can survive crashes at scaled speeds of hundreds of miles an hour without a dent. Or why don’t we make airliners out of paper if paper planes work so well and are so cheap? But in those cases you understand that it doesn’t work like that.
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