Yup. When in the water, the fish has already displaced its volume of water. When moving forward, or any direction in the depth it is, it does not have to do work against gravity. If the fish is swimming forward, the surplus of water in front of the fish can be considered going to fill the otherwise resulting void behind the fish. It does not have to be the exact same water molecules, pressure etc will take care of balancing the thing out.
I also agree that the article was not very informative, just repeating a kind of intro about the similarities. More detail would have been nice.
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Good point. However, it might be best to use something else than ordinary tap water for coolant, e.g. a mixture of pure water and antifreeze.
Yup. When in the water, the fish has already displaced its volume of water. When moving forward, or any direction in the depth it is, it does not have to do work against gravity. If the fish is swimming forward, the surplus of water in front of the fish can be considered going to fill the otherwise resulting void behind the fish. It does not have to be the exact same water molecules, pressure etc will take care of balancing the thing out.
I also agree that the article was not very informative, just repeating a kind of intro about the similarities. More detail would have been nice.
...is that engineers and future users will now have to endure endless uterances of "does-my-ass-look-big-in-this?"