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fighting ships of the world

UNITED STATES NAVY (UNITED STATES OF AMERICA)

SUBMARINES

ETHAN ALLEN nuclear powered ballistic missile submarines (1961 - 1963)

Ethan Allen 1971

Ethan Allen 1979

Sam Houston 1990

No Name Yard No Builder Laid down Launched Comm Fate
SSBN608, 9/1980- SSN608 Ethan Allen 154 Electric Boat, Groton 14/9/1959 22/11/1960 8/8/1961 attack nuclear-powered submarine 9/1980, stricken 4/1983
SSBN609, 11/1980- SSN609 Sam Houston 548 Newport News SB 28/12/1959 2/2/1961 6/3/1962 attack nuclear-powered submarine 11/1980, stricken 9/1991
SSBN610, 10/1980- SSN610 Thomas A. Edison 155 Electric Boat, Groton 15/3/1960 15/6/1961 10/3/1962 attack nuclear-powered submarine 10/1980, stricken 4/1986
SSBN611, 5/1981- SSN611 John Marshall 549 Newport News SB 4/4/1960 15/7/1961 21/5/1962 attack nuclear-powered submarine 5/1981, stricken 7/1992
SSBN618, 3/1981- SSN618 Thomas Jefferson 555 Newport News SB 3/2/1961 24/2/1962 4/1/1963 attack nuclear-powered submarine 3/1981, stricken 4/1986

 

Displacement standard, t

 

Displacement normal, t

6946 / 7884

Length, m

125.1

Breadth, m

10.1

Draught, m

8.40

No of shafts

1

Machinery

2 sets General Electric geared steam turbines, 1 Westinghouse S5W nuclear reactor

Power, h. p.

15000

Max speed, kts

16 / 21

Fuel, t

nuclear

Endurance, nm (kts)

practically unlimited

Armament

16 Polaris A-2 SLBM (UGM-27B), 4 - 533 Mk 65 TT (bow, 12)

Sensors

BPS-9 radar, BQS-4, BQR-7, BQR-15, BQR-19 sonars

Complement

110

Diving depth operational, m

400

   

Ship project history: The first US ballistic missile submarines designed as such, these ships, like the George Washingtons could not be refitted with the Poseidon missile and were therefore retired as attack submarines. All were originally armed with Polaris A-2, later refitted with A-3; they have towed array passive sonars for self-protection. They were, in effect, ballistic missile submarine versions of the Threshers, sharing their deeper-diving hull material and superior silencing. Physical changes on re-designated as SSN submarines began under the FY82 programme: missile tubes were filled with concrete, and missile fire control system removed. Proposals to install Tomahawk vertical launchers were abandoned.

Modernizations: late 1960s, all: - 16 Polaris A-2 SLBM (UGM-27B); + 16 Polaris A-3 SLBM (UGM-27C)

1982, Ehan Allen; 1984, Sam Houston, Thomas A. Edison; 1985, John Marshall, Thomas Jefferson: - 16 Polaris A-3 SLBM (UGM-27C)

1985, Sam Houston, John Marshall: + double DDS, accommodation for 67 SEALs, SDV

Naval service: No significant events.

Thomas Jefferson 1977

John Marshall 1991

Ivan Gogin, 2015