I seen a picture of a boat on Instagram. this guy had 6 engines on the back of this boat. I don't know anything about boat engines. But I am curious would this really change the boat speed.
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Perhaps one 700 horsepower engine would be more or less efficient on a boat than 7 100 horsepower engines, but I would think that the major factor would be total horsepower
Though also in the water I would think that the amount of propeller and its efficiency could matter also, so perhaps 7 100 horsepower engines might be faster than one 700 horsepower engine unless the propeller was also 7 times the size with the same relative efficiency