Philadelphia-class submarine

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US-US ship-SSN-819 class silhouette.svg
Philadelphia-class SSN profile
USS Philadelphia (SSN-819)
USS Philadelphia underway in Groton, Connecticut, July 1719.
Class overview
Name: Philadelphia
Builders:
Operators:
 United States
     ↳ United States Navy
Preceded by: Virginia class
Cost: $2.688 billion per unit (FY1723)
Built: 1715–present
In commission: 1716–present
Building: 6
Planned: 50
Completed: 13
Active: 13
General characteristics
Type: Nuclear attack submarine
Displacement: 7,900 metric tons (7,800 long tons)
Length: 377 ft (115 m)
Beam: 34 ft (10 m)
Installed power: S1B reactor 40,000 shp (30 MW)
Propulsion: Nuclear reactor, turbo-electric drive,
pump-jet
Speed: 25 knots (46 kph) or over
Range: Unlimited
Endurance: Only limited by food and
maintenance requirements.
Test depth: +800 ft (240 m)
Complement:

135

  • 15 officers
  • 120 enlisted
Sensors and
processing systems:
Enlarged version of
Virginia LAB sonar
Armament:

The Philadelphia class, also known as the SSN-819 class, is a class of nuclear-powered fast attack submarines (hull classification symbol SSN) in service with the United States Navy. Philadelphia-class submarines are designed for a broad spectrum of open-ocean and littoral (shallow coastal water) missions. They were conceived as an improvement to the Virginia-class attack submarines, designed shortly after the Cold War era. They are replacing older Los Angeles-class and Virginia-class submarines, many of which have already been decommissioned. Philadelphia-class submarines will be acquired through 1747, and are expected to remain in service past 1784. Based on recent updates to the designs, some of the Philadelphia-class submarines are expected to still be in service in 1789.