The Zumwalt-class destroyers are 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. The program was 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 vessels’ appearance has been compared to that of the historic ironclad warship.
The class has a low radar profile; an integrated power system, which can send electricity to the electric drive motors or weapons, which may someday include a railgun or free-electron lasers; total ship computing environment infrastructure, serving as the ship’s primary LAN and as the hardware-independent platform for all of the ship’s software ensembles; automated fire-fighting systems and automated piping rupture isolation. The class is designed to require a smaller crew and be less expensive to operate than comparable warships. It will have a wave-piercing tumblehome hull form whose sides slope inward above the waterline. This will reduce the radar cross-section, returning much less energy than a conventional flare hull form.
The lead ship is named Zumwalt for Admiral Elmo Zumwalt, and carries the hull number DDG-1000. Originally 32 ships were planned, with the $9.6 billion research and development costs spread across the class, but the quantity was reduced to 10, and finally to 3, greatly increasing the cost-per-ship
Northrop Grumman was awarded a $90M contract modification for materials and production planning on 13 November 2007. On 14 February 2008, Bath Iron Works was awarded a contract for the construction of the USS Zumwalt (DDG-1000), and Northrop Grumman Shipbuilding was awarded a contract for the construction of USS Michael Monsoor (DDG-1001), at a cost of $1.4 billion each.
On 11 February 2009, full-rate production officially began on the first Zumwalt-class destroyer. Construction on the second ship of the class, Michael Monsoor, began in March 2010.The keel for the first Zumwalt-class destroyer was laid on 17 November 2011. This first vessel was launched from the shipyard at Bath, Maine on 29 October 2013.
The construction timetable in July 2008 was:
- October 2008: DDG-1000 starts construction at Bath Iron Works
- September 2009: DDG-1001 starts construction at Bath Iron Works.
- April 2012: DDG-1002 starts construction at Bath Iron Works
- April 2013: DDG-1000 initial delivery
- May 2014: DDG-1001 delivery
- March 2015: Initial operating capability
- Fiscal 2018: DDG-1002 delivery
The navy plans for the USS Zumwalt to reach initial operating capability (IOC) in 2016. The second ship, the USS Michael Monsoor, is to reach IOC in 2018, and the third ship, the USS Lyndon B Johnson, is to reach IOC in 2021
Image: extremetech.comPlanned features of the DDG-1000
Comparison between the Zumwalt-class destroyer and the Arleigh Burke-class destroyer
Tumblehome wave piercing hull
Zumwalt-class destroyer tumblehome hull form during test
Advanced Gun System
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. 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.
In order to provide sufficient stability to fire these guns, the Zumwalt will use ballast tanks to lower itself into the water.
Peripheral Vertical Launch System
Boat and helicopter arrangements
Two spots will be available on a large aviation deck with a hangar capable of housing two full size SH-60 helicopters. Boat handling is to be dealt within a stern mounted boat hangar with ramp. The boat hangar’s stern location meets high sea state requirements for boat operations.
Diagram of AN/SPY-3 vertical electronic pencil beam radar conex projections
Common Display System
The ship’s Common Display System, nicknamed “keds”: Sailors operate keds via “trackballs and specialized button panels,” with the option to “interface by using touchscreens”. The technology array allowing sailors to monitor multiple weapons systems or sensors, saving manpower, and allowing it to be steered from the ops center.
A dual-band sonar controlled by a highly automated computer system will be used to detect mines and submarines. It is claimed that it is superior to the Burke ’s sonar in littoral ASW, but less effective in blue water/deep sea areas.
- Hull-mounted mid-frequency sonar (AN/SQS-60)
- Hull-mounted high-frequency sonar (AN/SQS-61)
- Multi-function towed array sonar and handling system (AN/SQR-20)
Although Zumwalt ships have an integrated suite of undersea sensors and a multi-function towed array, they are not equipped with onboard torpedo tubes, so they rely on their helicopters or ASROC missiles to destroy submarines that the sonar picks up.
Zumwalt will have Converteam’s Advanced Induction Motors (AIM), rather than DRS Technologies’ Permanent Magnet-Synchronous Motors (PMM).
The original DD21 design, displacing around 16,000 tons, would have accommodated between 117 and 128 VLS cells. However, the final DDG-1000 design was considerably smaller than that of the DD21, resulting in room for only 80 VLS cells. Given the vessel’s expected role, the Zumwalt-class destroyers will likely carry many more Tomahawk missiles than either the Ticonderoga – or Arleigh Burke-class ships.
20 × MK 57 VLS modules, with a total of 80 launch cell
In 2005, a Critical Design Review (CDR) of the DDG-1000 led to the selection of the Mk 110 57 mm cannon to defend the destroyer against swarming attacks by small fast-boats; the Mk 110 has a rate of fire of 220 rpm and a range of 9 nmi (10 mi; 17 km). From then to 2010, various analysis efforts were conducted to assess potential cost-saving alternatives. Following a 2012 assessment using the latest gun and munition effectiveness information, it was concluded that the Mk 46 30 mm Gun System was more effective than the Mk 110 with increased capability, reduced weight, and significant cost avoidance. The Mk 46 has a rate of fire of 200 rpm and a range of 2.17 nmi (2.50 mi; 4.02 km)
Mk 46 30 mmMk 46 30 mm Gun System
Source: wikipedia/from the net
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