It's understandable that the first useful motors would be smaller than you seem to require. Big boats are fun and useful, but so are small boats. Someone will e

It's understandable that the first useful motors would be smaller than you seem to require. Big boats are fun and useful, but so are small boats. Someone will eventually make motors big enough for your needs. In the meantime, other boaters will enjoy the motors described in TFA. If you want to "travel between continents", get a sailboat. No powerboat is practical for that. If you're just talking about a fishing trip, powerboats smaller than 10M can certainly get you out of sight of shore.