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"""
The Zumwalt-class destroyer is a class of United States Navy guided missile destroyers designed as multi-mission stealth ships with a focus on land attack. The class emerged from the previous DD-21 vessel program, previously known as the "DD(X)". The class is multi-role and designed for surface warfare, anti-aircraft warfare, and naval gunfire support. They take the place of battleships in filling the former congressional mandate for naval fire support, though the requirement was reduced to allow them to fill this role.
[...]
The lead ship is named Zumwalt for Admiral Elmo Zumwalt, and carries the hull number DDG-1000. Originally 32 ships were planned, with $9.6 billion research and development costs spread across the class. As costs overran estimates, the quantity was reduced to 24, then to 7, and finally to 3, significantly increasing the cost-per-ship to $3.96 billion (excluding R&D costs) – well-exceeding the per-unit cost of a nuclear-powered Virginia-class submarine ($2.688 billion). The dramatic per-unit cost increases eventually triggered a Nunn-McCurdy Amendment breach, and cancellation of further production. In April 2016, the total program cost was $22.5 billion with an average cost of $7.5 billion per ship.
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Advanced Gun System (https://en.wikipedia.org/wiki/Advanced_Gun_System)

There has been research on extending the range of naval gunfire for many years. Canadian engineer Gerald Bull and Naval Ordnance Station Indian Head tested an 11-inch (279 mm) sub-caliber saboted long-range round in a stretched 16-inch (406 mm)/45 caliber Mark 6 battleship gun in 1967. The Advanced Gun Weapon System Technology Program (AGWSTP) evaluated a similar projectile with longer range in the 1980s. After the battleships were decommissioned in 1992, the AGWSTP became a 5-inch (130 mm) gun with an intended range of 180 kilometers (110 mi), which then led to the Vertical Gun for Advanced Ships (VGAS). The original DD-21 was designed around this "vertical gun", but the project ran into serious technology/cost problems and was radically scaled back to a more conventional 6.1-inch (155 mm) Advanced Gun System (AGS). One advantage of this move was that the gun was no longer restricted to guided munitions.

The Advanced Gun System is a 155 mm naval gun, two of which would be installed in each ship. This system consists of an advanced 155 mm gun and the Long Range Land Attack Projectile (LRLAP). This projectile is a rocket with a warhead fired from the AGS gun; the warhead weighs 11 kg / 24 lb and has a circular error of probability of 50 meters. This weapon system will have a range of 83 nautical miles (154 km); the fully automated storage system will have room for up to 750 rounds. The barrel is water-cooled to prevent overheating and allows a rate of fire of 10 rounds per minute per gun. The combined firepower from a pair of turrets gives each Zumwalt-class destroyer firepower equivalent to 12 conventional M198 field guns. This initial strike fire power is possible by using a Multiple Rounds Simultaneous Impact (MRSI) firing tactic and does not equal the sustained fire power. To provide sufficient stability to fire these guns, the Zumwalts will use ballast tanks to lower themselves into the water.

Lyndon B. Johnson, the last Zumwalt, is being considered for the installation of a railgun in place of one of the 155 mm naval guns after the ship is built. This is due to the installed Rolls-Royce turbine generators being capable of producing 78 megawatts (105,000 hp), enough to power the electromagnetic weapon.
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https://en.wikipedia.org/wiki/Zumwalt-class_destroyer
https://en.wikipedia.org/wiki/Zumwalt-class_destroyer

Labels: Oleg Zabluda

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