Virginia class Attack Submarine - SSN

 

virginia class attack submarine ssn us navy general dynamics huntington ingalls

 

 

Boats:

units

in service

 

Virginia class - Block I

SSN 774 USS Virginia

2004

 

SSN 775 USS Texas

2006

 

SSN 776 USS Hawaii

2007

 

SSN 777 USS North Carolina

2008

 

 

Virginia class - Block II

SSN 778 USS New Hampshire

2008

 

SSN 779 USS New Mexico

2010

 

SSN 780 USS Missouri

2010

 

SSN 781 USS California

2011

 

SSN 782 USS Mississippi

2012

 

SSN 783 USS Minnesota

2013

 

 

Virginia class - Block III

SSN 784 USS North Dakota

2014

 

SSN 785 USS John Warner

2015

 

SSN 786 USS Illinois

2016?

 

SSN 787 USS Washington

 

 

SSN 788 USS Colorado

 

 

SSN 789 USS Indiana

 

 

SSN 790 USS South Dakota

 

 

SSN 791 USS Delaware

 

 

 

Virginia class - Block IV

SSN 792 USS Vermont

 

 

SSN 793 USS Oregon

 

 

SSN 794 USS

 

 

SSN 795 USS Hyman G. Rickover

 

 

SSN 796 USS New Jersey

 

 

SSN 797 USS

 

 

SSN 798 USS

 

 

SSN 799 USS Idaho

 

 

SSN 800 USS

 

 

SSN 801 USS

 

 

 

Virginia class - Block V

SSN 802 USS

 

 

SSN 803 USS

 

 

SSN 804 USS

 

 

SSN 805 USS

 

 

 

Specifications:

Builders:

General Dynamics Electric Boat, Groton, Connecticut

Huntington Ingalls Industries - Newport News Shipbuilding, Newport News, Virginia

Displacement:

7900 tons (submerged)

Length:

114,9 meters

Beam:

10,36 meters

Draft:

9,8 meters

Max Speed:

34 knots (= 63 km/h)

Propulsion:

1 x General Electric S9G nuclear reactor

29,8 MW delivering 40000 shp

1 shaft / 1 propeller

Complement:

132

Armament:

Mk-45 Vertical Launching System (VLS) (12 cells)

for UGM-109 Tomahawk missiles or UGM-84 Harpoon SSM

4 x 21 (533mm) torpedo tubes for Mk-48 torpedoes

 

Block I:
Modular construction techniques were incorporated during construction. Earlier submarines (e.g. Los Angeles class SSNs) were built by assembling the pressure hull and then installing the equipment via cavities in the pressure hull. This required extensive construction activities within the narrow confines of the pressure hull which was time consuming and dangerous. Modular construction was implemented in an effort to overcome these problems and make the construction process more efficient. Modular construction techniques incorporated during construction include constructing large segments of equipment outside the hull. These segments (dubbed rafts) are then inserted into a hull section (a large segment of the pressure hull). The integrated raft and hull section form a module which when joined with other modules forms a Virginia class submarine. Block I boats were built in 10 modules with each submarine requiring roughly 7 years (84 months) to build.

Block II:
Block II boats were built in four sections rather than ten sections, saving about $300 million per boat. Block II boats (excluding SSN-778) were also built under a multi-year procurement agreement as opposed to a block-buy contract in Block I, enabling savings in the range of $400 million ($80 million per boat). As a result of improvements in the construction process, New Hampshire (SSN-778) was 500 million USD cheaper, required 3.7 million fewer labor hours to build (25% less) thus shortening the construction period by 15 months (20% less) compared to USS Virginia (SSN-774).

Block III:
SSN-784 through approximately SSN-791 are planned to make up the Third Block or "Flight" and began construction in 2009. Block III subs will feature a revised bow with a Large Aperture Bow (LAB) sonar array, as well as technology from Ohio-class SSGNs (2 VLS tubes each containing 6 missiles). The horseshoe-shaped LAB sonar array will replace the spherical main sonar array which has been used on all U.S. Navy SSNs since 1960. The LAB sonar array is water-backed as opposed to earlier sonar arrays which were air-backed and consists of a passive array and a medium-frequency active array. Compared to earlier Virginia class submarines about 40% of the bow has been redesigned.


Block IV:
The most costly shipbuilding contract in history was awarded on 28 April 2014 as prime contractor General Dynamic Electric Boat took on a $17.6 billion contract for ten Block IV Virginia-class attack submarines. The main improvement over the Block III is the reduction of major maintenance periods from four to three, increasing each ship's total lifetime deployments by one.

The long-lead-time materials contract for SSN 792 was awarded on 17 April 2012, with SSN 793 and SSN 794 following on 28 December 2012. the U.S. Navy has awarded General Dynamics Electric Boat a $208.6 million contract modification for the second fiscal year (FY) 14 Virginia-class submarine, SSN-793, and two FY 15 submarines, SSN-794 and SSN-795.With this modification, the overall contract is worth $595 million. Block IV will consist of 9-10 submarines.

 

source: wikipedia

 

images

 

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