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Why can Iowa-class battleships only travel up to 30 knots, while the United States with Iowa-class power engines can travel up to 43 knots?
The displacement of the Iowa class battleship is 557 10 tons (full load), and the empty weight (only armor and hull structure) reaches 28,000 tons.

The displacement of the United States is only 53,329 tons, but the structural weight and shell (armor) weight of the cruise ship add up to 20,000 tons. Because this cargo is large, it can carry more cargo or cabins, but the displacement does not represent its weight. Warships require thick armor protection and collision resistance, so cruise ships must run fast at the same horsepower.