Futurism brings to attention the US Navy's railguns, electromagnetic cannons capable of shooting a projectile at 7,000 kmh, with a range of 200 km. Because of the sheer amount of power and equipment required, only very large ships will be able to carry the equipment, potentially giving battleships a resurgence.
One of the first platforms the railgun will be gracing is, not surprisingly, ships. Particularly, battleships and destroyers. Due to the large power requirements of the gun— a 25 megawatt power plant and large capacitor bank— only ships can carry it, with the most likely candidate being the DDG 1000 Zumwalt-class destroyers and its 78-megawatt integrated power system.
The Navy retired much of its gun battleships after WWII, due to limited range and accuracy of gunpowder weapons. Missiles and jet fighters became the name of the game during the Cold War, extending range of ship operations. Now, battleships may get a resurgence.
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