Great Idea, no moving
parts to wear out, now if we can just figure out how to get the nuclear powerplant required to run it on board we'll be all set. I never read anything about a yacht size device but I did read something about them about 30 years ago and they took a lot of
power and weren't very efficient. Notice that even the
navy is still using propellers on nuclear subs even though they started looking at MHD drives 40 + years ago.