The practicality is borderline: https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive#Marine_propulsion https://en.wikipedia.org/wiki/Magnetohydrodynamic_driv

The practicality is borderline: https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive#Marine_propulsion https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive#Mari... It's not completely infeasible, but it's beaten by a lot of other things.