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The Navy's electromagnetic railgun, which accelerates a projectile to 5,000 mph in 0.01 seconds using a simple (and enormous) charge, requires no explosives and only one man to load and fire. It's been in production since 2005 and should be completed by 2017. A few more facts:
• Each projectile is 18 inches long and weighs 23 pounds.
• The cost to fire a projectile is approximately $25,000—as much as 60 times less than traditional artillery.
• After storing up a charge,the gun releases 1,200 volts in 10 milliseconds.
• Firing distance exceeds 100 miles.
• In tests the projectiles were able to pierce three walls of reinforced concrete or six steel plates.
