this post was submitted on 11 Dec 2023
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And when they're moving, they're highly inefficient as well. With a displacement ship hull designed to part the water their top speed is limited by their own length. A ship cannot overtake its own bow wake and with a length of let's say 70 meters you end up at a top speed of about 20 knots. Which isn't slow, but also not that much faster than cargo or passenger transport (maybe going 10 to 15 knots).
While a cargo ship is mostly longer and could theoretically sail faster, it is designed to be economical. It gets an engine that is most efficient at a certain speed, for example 12 knots at ahead standard, the propeller is cut for efficiency etc.
A yacht is designed to be comfortable and fast. It gets powerful engines that combust however much they need to combust. The propeller may be designed to produce less noise or vibration instead of being most fuel efficient.