Tullibee-class submarine

Tullibee-class submarine
Name	Tullibee-class submarine
Builders	General Dynamics Electric Boat, Groton, Connecticut
Built	1957–1959
In service	1959–1993
Retired	1993
Type	auxiliary antisubmarine warfare submarine
Crew	89
Length	252 ft (77 m)
Beam	27 ft (8.2 m)
Displacement	3,000 t submerged
Propulsion	single screw turbo-electric drive
Speed	approximately 15 knots submerged
Armament	4 × bow torpedo tubes

Tullibee-class submarine was a small, specialized United States Navy nuclear-powered attack submarine designed in the late 1950s for acoustic antisubmarine warfare; it emphasized low acoustic signature, novel propulsion, and sonar experimentation. Commissioned during the Cold War, the class consisted of two boats and served primarily in Atlantic and Arctic operations, contributing to sonar development, tactics, and submarine quieting research prior to their decommissioning in the early 1990s. The program influenced later Los Angeles-class submarine quieting efforts and informed acoustic measurement techniques used by Naval Undersea Warfare Center researchers.

Design and Development

The Tullibee concept originated under guidance from Chief of Naval Operations planners and Naval Reactors oversight to address perceived gaps revealed in exercises involving North Atlantic Treaty Organization antisubmarine operations and encounters with Soviet Navy submarines such as Whiskey-class submarine and Zulu-class submarine. Design responsibility fell to General Dynamics Electric Boat in collaboration with Newport News Shipbuilding technical consultants and input from Office of Naval Research acousticians. Emphasis was placed on low radiated noise drawing on studies from National Advisory Committee for Aeronautics-era acoustics work and data from Underwater Sound Laboratory projects. To minimize screw cavitation and machinery noise, engineers adopted a novel turbo-electric drive inspired by earlier USS Albacore (AGSS-569) hydrodynamic research and lessons from USS Nautilus (SSN-571) reactor integration. Hull form and internal machinery isolation reflected findings from Project Kayo and Project Hartwell quieting initiatives commissioned by Bureau of Ships and overseen by Secretary of the Navy technical panels.

Specifications

Hull and machinery dimensions were compact compared to contemporary Skipjack-class submarine and Thresher-class submarine designs. The pressure hull utilized HY-80 steel specified under American Bureau of Shipping guidelines and met standards influenced by ASME pressure vessel practices. Nuclear propulsion used a S2W-derived reactor plant under Admiral Hyman G. Rickover-era standards with a turbo-electric transmission arrangement similar in concept to systems evaluated by Argonne National Laboratory and Oak Ridge National Laboratory engineering studies. Acoustic treatments included raft-mounted machinery, anechoic coatings tested with guidance from Naval Ordnance Laboratory, and a skewed single-screw propulsor developed from David W. Taylor Naval Ship Model Basin experiments. Sonar fit prioritized a high-frequency bow array and flank array prototypes influenced by Naval Research Laboratory designs and early AN/BQQ-2 development paths. Standard complement and habitability layout reflected Bureau of Ships crew habitability standards and Naval Personnel Command staffing models.

Operational History

Tullibee-class boats conducted patrols, trials, and measurement missions primarily under the operational control of Submarine Force Atlantic and periodically participated in exercises with Atlantic Fleet carrier groups, Allied Command Atlantic, and Standing Naval Force Atlantic taskings. Missions included under-ice operations proximate to Greenland, acoustic measurement trials in the Norwegian Sea, and cooperative sonar experiments with Naval Undersea Warfare Center divisions and academic partners such as Massachusetts Institute of Technology and Woods Hole Oceanographic Institution. Their turbo-electric propulsion and acoustic signature made them useful as targets and test platforms in exercises with Carrier Strike Group 6 and antisubmarine warfare units including HMS Dreadnought (S101) escorts and Royal Canadian Navy frigates. Technical evaluations informed Operational Test and Evaluation Force reports and influenced procurement decisions affecting Seawolf-class submarine and Virginia-class submarine acoustic requirements. Both boats were decommissioned and stricken in the post-Cold War drawdown overseen by Secretary of Defense management boards.

Ships in Class

- USS Tullibee (SSN-597) — keel laid by General Dynamics Electric Boat; commissioned 1959; decommissioned 1988; involved in Arctic testing with Submarine Development Squadron 12. - USS Seawolf (SSN-575) — NOTE: do not confuse with later Seawolf-class submarine; the second Tullibee-class hull was distinct in name and service record. (Operational details mirrored Tullibee; decommissioned 1993.)

Modifications and Upgrades

Throughout service, Tullibee-class boats received incremental upgrades directed by Naval Sea Systems Command and Naval Reactors programs: sonar sensor suites received revised transducer arrays influenced by work at Applied Physics Laboratory, Johns Hopkins University; fire-control and torpedo interfaces aligned with Mark 48 torpedo integration studies and AN/BQQ-5 processing improvements; habitability and life-support systems were retrofitted to meet standards promulgated by Medical Department, United States Navy. Acoustic treatments were periodically updated following recommendations from Acoustic Research Detachment teams and NAVSEA quieting initiatives derived from Admiralty Research Establishment consultations. Propulsion controls were refined using control theory research from MIT Lincoln Laboratory and reactor plant monitoring enhancements from Knolls Atomic Power Laboratory.

Evaluation and Legacy

Evaluations by Office of the Secretary of Defense analysts and Congressional Research Service reviewers recognized the Tullibee class as influential in acoustic research and quieting techniques despite limitations in speed and payload relative to Permit-class submarine and later Los Angeles-class submarine designs. Lessons from their turbo-electric drive, hull acoustics, and sonar experimentation fed into ASW doctrine revisions in NATO circles and shaped acoustic signature reduction programs undertaken by Naval Undersea Warfare Center. The class is cited in historical assessments by Naval History and Heritage Command and technical retrospectives at Naval Research Laboratory as pivotal in transitioning submarine design priorities toward survivability against advanced Soviet Navy sensors. Surviving material and technical reports influenced modern submarine acoustic metrology at institutions such as Scripps Institution of Oceanography and remain part of curriculum at United States Naval Academy engineering courses.

Category:Submarine classes of the United States Navy