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) |
|
Electronic equipment |
BPS-9 radar, BQS-4, BQR-7, BQR-15, BQR-19 sonars |
|
Complement |
110 |
|
Diving depth operational, m |
400 |
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