Making a stealth boat

evilmadscientist.com — After trying out our simple demonstration of magneto hydrodynamic (MHD) propulsion, you might want to make something a little more "practical." Here's how to build a simple little boat that moves through salt water (at a snail's pace) via MHD propulsion. No propeller noise = They won't hear you coming. Sep 23, 2006 View in Crawl 4