http://www.popularmechanics.com/technology...aw/4247543.html
According to Dr. Amir Chaboki, the program manager for Electro-Magnetic Rail Guns at BAE Systems, “The power is available. The challenge is how you use it.” The Navy’s electrically-propelled DDG 100 Destroyer, Chaboki says, is a prime candidate for the final 64-megajoule system. Around 72 megawatts (MW) of the vessel’s power can be used for propulsion. But during combat, the destroyer’s speed could be brought down, freeing up energy for a rail gun. Chaboki calculates that firing the 64-megajoule weapon six times per minute would require 16 MW of power, which would be supplied by either onboard capacitors or pulsed alternators. The more daunting challenge is the force of the rail gun itself: A few shots can dislodge the conducting rails—or even damage the barrel of the gun.
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The Marines, in particular, are interested in the potential for rail guns to deliver supporting fire from up to 220 miles away—around 10 times further than standard ship-mounted cannons—with rounds landing more quickly and with less advance warning than a volley of Tomahawk cruise missiles.
COWNAGE?