USS Albacore (AGSS-569)

USS Albacore (AGSS-569) was a unique research submarine developed by the United States Navy to pioneer the revolutionary teardrop hull form. Built at the Portsmouth Naval Shipyard and commissioned in 1953, her sole purpose was to serve as a high-speed underwater test platform, free from the constraints of combat systems. The data gathered from *Albacore*'s extensive trials fundamentally transformed global submarine design, directly influencing every subsequent American submarine class, including the *Skipjack*-class and the *Thresher*-class.

Design and development

The genesis of *Albacore* lay in post-World War II studies, notably those conducted by the Massachusetts Institute of Technology and the David Taylor Model Basin, which indicated a radical teardrop shape would drastically reduce underwater drag and increase speed. Authorized by the United States Congress in 1950, her design was overseen by the Navy's Bureau of Ships with a singular focus on hydrodynamic efficiency, omitting traditional armaments like torpedo tubes. Key innovations included the first use of HY-80 high-tensile steel, a single large propeller, and cruciform control surfaces at the stern, which replaced the traditional diving plane configuration. Her construction at the Portsmouth Naval Shipyard represented a significant departure from the fleet submarine designs of the Korean War era.

Service history

Following her commissioning ceremony presided over by Admiral Robert B. Carney, *Albacore* began an extensive career of trials and experimental operations primarily along the East Coast of the United States and in the Atlantic Ocean. Assigned to the Atlantic Fleet's Submarine Development Group 2, she tested numerous configurations of control surfaces, propellers, sonar domes, and escape hatches. A major refit in 1961 replaced her original stern with an "X-stern" configuration for enhanced maneuverability. Throughout the 1960s, she served as a testbed for advanced concepts, including trials related to the SUBROC weapon system and various acoustic silencing techniques, before concluding her active service in 1972.

Influence on submarine design

The hydrodynamic data from *Albacore* proved transformative, validating the teardrop hull as the optimal form for submerged performance. Her success directly enabled the design of the *Skipjack*-class, the first class to combine this hull with a nuclear reactor, creating the fastest submarines of their time. The principles were further applied to the *Thresher*-class and all subsequent U.S. attack and ballistic missile submarines, including the *Los Angeles*-class and *Ohio*-class. Internationally, her influence was profound, with the hull form being adopted by numerous navies, including the Royal Navy's HMS *Dreadnought* and the Soviet Navy's *November*-class.

Specifications (AGSS-569)

* **Displacement:** 1,500 long tons (1,524 t) surfaced; 1,850 long tons (1,880 t) submerged * **Length:** 205 ft (62 m) * **Beam:** 27 ft (8.2 m) * **Draft:** 19 ft (5.8 m) * **Propulsion:** Two General Motors Cleveland 16-338 "pancake" diesel engines (1,700 hp); two General Electric electric motors (15,000 hp); one shaft * **Speed:** 25 knots (46 km/h) surfaced; 33+ knots (61+ km/h) submerged (estimated) * **Complement:** 5 officers, 49 enlisted * **Armament:** None (experimental platform only)

Museum ship

After decommissioning, *Albacore* was stricken from the Naval Vessel Register in 1980. Following a complex overland move, she was dedicated as a permanent memorial and museum in Portsmouth, New Hampshire, in 1985. The vessel is now the centerpiece of the Portsmouth Albacore Park, where she is displayed out of water in a custom-built basin. Designated a National Historic Landmark in 1989 for her unparalleled contribution to naval architecture, she is maintained by the Portsmouth Historical Society and is open for public tours.

Category:Submarines of the United States Category:Research vessels of the United States Navy Category:Museum ships in New Hampshire Category:National Historic Landmarks in New Hampshire