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US Navy APHNAS (Advanced Performance High-speed Nuclear Attack Submarine) 1971

Triton

Donald McKelvy
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The APHNAS (Advanced Performance High-speed Nuclear Attack Submarine) from 1971 was armed with four torpedo tubes and 20 cruise missile tubes aft of the sail.

Specifications
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LOA (ft): 400
Diamater (ft): 40
Surfaced displacement (tons): 12,075
Submerged displacement (tons): 13,649
Mean draft (ft): 32.8
Officers: 12
CPOs: 15
Enlisted: 84
Reserve bouyancy: 13%

Image and specifications from US Submarines Since 1945: An Illustrated Design History by Norman Friedman.

http://books.google.com/books?id=OJLiSJ1w6IYC&pg=PA170&lpg=PA170&dq=APHNAS+submarine&source=bl&ots=JnuAyfVyOf&sig=MQIX_yz4rrq2KmbcL-EfdTGcAM4&hl=en&ei=IipdSv6bAofgswPRxsmzCg&sa=X&oi=book_result&ct=result&resnum=1

The new submarine was the first one designed for an entirely passive operation, that is, detecting targets passively at long range and then obtaining an entirely passive fire control solution. She was therefore designed at the outset to have a towed array. The active bow sphere had to be retained as a hedge against Soviet silencing.
(Page 170)

The project was killed by Admiral Elmo Zumwalt in late 1972.

If built, the ship would have been classified as an SSGN. SSGN-01?

The cruise missile tubes were supposed to carry 20 STAM (submarine tactical missile).
 

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Triton

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Found information about STAM (Submarine Tactical Missile) or UGM-89 Perseus:

In March 1969, the U.S. Navy issued a requirement for the STAM (Submarine Tactical Missile), a new submarine-launched dual role (anti-sub/anti-ship) attack missile. It was to have a range between 9 km (5 nm) and 55 km (30 nm), and carry a new high-performance homing torpedo. STAM was to be a large missile with a length of about 7.6 m (300 in) and a diameter of 76 cm (30 in). This made it too large for torpedo tubes, and therefore a new attack submarine (SSN) type was proposed which would carry 20 STAMs in vertical launch tubes. This new SSN would have been much larger, and therefore much more expensive, than existing SSN classes. The STAM project and the new submarine class were eventually cancelled in 1973. As a replacement, the submarine-launched UGM-84 version of the Harpoon missile was developed and fielded on existing SSNs.

http://www.designation-systems.net/dusrm/m-89.html
 

TomS

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If built, the ship would have been classified as an SSGN. SSGN-01?

Nope. The USN has numbered specialty combatant subs (e.g, ballistic missile and cruise missile boats) in the same SS/SSN sequence as the original attack boats, save for the odd exception for SSN-21, -22, and -23. There had already been one nuclear cruise missile sub -- USS Halibut (SSGN 587) -- and lots of boomers, so the practice was well-established. The precise hull number of APHNAS would depend on when the first one was ordered and how the previous production line was closed out, but something in the low 700s (e.g., SSGN-710) seems likely.
 

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