Impressive picture from the US Navy’s Office of Naval Research when they demonstrated an electromagnetic railgun system accelerating a 7 lb projectile to 2520 meters per second with an energy of 10.64MJ. Video here.
U.S. Navy Demonstrates World’s Most Powerful EMRG at 10 Megajoules – Navy.mil, 2/1/2008
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That is very impressive, especially considering the projectile’s only 7 pounds!