A magnetohydrodynamic drive or MHD propulsor is a method for propelling seagoing vessels using only electric and magnetic fields with no moving parts, using magnetohydrodynamics. The working principle involves electrification of the propellant (gas or water) which can then be directed by a magnetic field, pushing the vehicle in the opposite direction. Although some working prototypes exist, MHD drives remain impractical.
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“They shoulda called me Little Cocaine, I was sniffing so much of the stuff! My nose got big enough to back a diesel truck in, unload it, and drive it right out again.”
—Little Richard (b. 1932)