Sikorsky SH-3 Sea King

Sikorsky SH-3 Sea King
Country	USA
Role	Anti-submarine warfare, search and rescue and utility helicopter
First flight	11 March 1959
Built	Unknow

The Sikorsky SH-3 Sea King (company designation S-61) is an American twin-engined anti-submarine warfare (ASW) helicopter designed and built by Sikorsky Aircraft. A landmark design, it was the world’s first amphibious helicopter and one of the first ASW rotorcraft to use turboshaft engines.

Source: Sikorsky SH-3 Sea King on Wikipedia

Sikorsky SH-3G Sea King Walk Around
Photographer	Vladimir Yakubov
Localisation	USS Yorktown CV-10, Patriots Point
Photos	148

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Sikorsky SH-3D Sea King Walk Around
Photographer	Vojtech Peterka
Localisation	Unknow
Photos	20

Sikorsky SH-3D Sea King

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The Legendary Amphibious Anti-Submarine Warfare Pioneer

The Sikorsky SH-3 Sea King (factory designated as the S-61) was a twin-turboshaft medium amphibious hunter-killer helicopter designed and built by the Sikorsky Aircraft Corporation. Introduced in 1961 for the United States Navy, the SH-3 was a revolutionary rotary-wing design: it was the world’s first amphibious helicopter and the first to combine both anti-submarine detection (hunter) and weapon delivery (killer) capabilities into a single integrated airframe. Featuring a boat-hull fuselage, retractable main landing gear housed in side sponsons, and twin General Electric turboshaft engines, the Sea King served for over four decades as the U.S. Navy’s primary carrier-based Anti-Submarine Warfare (ASW) and Search and Rescue (SAR) platform, while also gaining global fame as the primary Presidential transport helicopter (“Marine One”) and Apollo spacecraft recovery vehicle.

Attribute	Technical Specification (U.S. Navy SH-3H Sea King Standard)
Role	Carrier-Based Anti-Submarine Warfare (ASW) / Combat Search & Rescue (CSAR) Helicopter
Crew	4 (Pilot, Co-Pilot, Tactical Coordinator / Tactical Sensor Operator, Acoustic Sensor Operator)
Powerplant	2 × General Electric T58-GE-10 turboshaft engines (1,400 shp each)
Maximum Speed	267 km/h (166 mph / 144 knots) max speed \| ~219 km/h (136 mph / 118 knots) cruise speed
Gross / Takeoff Weight	9,525 kg (21,000 lbs) maximum gross weight \| ~5,382 kg (11,865 lbs) empty weight
Service Ceiling / Operational Range	4,480 m (14,700 ft) ceiling \| ~1,000 km (621 miles) range
Rotor Systems	5-bladed main rotor (power-folding) + 5-bladed tail rotor (power-folding tail pylon)
ASW Sensors & Avionics	AQS-13D dipping sonar, ARR-75 sonobuoy receiver system, ASQ-81 Magnetic Anomaly Detector (MAD) bird, LN-66HP radar
Armament Options	Up to 380 kg (840 lbs) of ordnance: 2 × Mk 46/Mk 50 lightweight homing torpedoes or B57 nuclear depth charges
Production Total	1,100+ units produced across Sikorsky, Westland (UK), Mitsubishi (Japan), and Agusta (Italy) license lines

Design Engineering: Watertight Hull, Twin Turboshafts, and Integrated ASW Suite

Watertight Hydrodynamic Boat Hull: The SH-3 was designed with a flying-boat style hull and outrigger sponsons housing retractable main wheels. This amphibious construction allowed the helicopter to execute emergency water landings or remain afloat during extended open-ocean dipping sonar operations in rough sea states.
Twin-Turboshaft Powerplant Advantage: Departing from earlier piston-powered predecessors (like the H-34), the Sea King incorporated two General Electric T58 turboshaft engines mounted above the main cabin. This provided immense lifting capacity, low vibration, and critical single-engine safety margins while hovering close to the wave tops at night.
Integrated “Hunter-Killer” Electronics Suite: Prior to the SH-3, ASW operations required two separate helicopters—one to search and one to attack. The SH-3 merged these roles into one platform equipped with a dipping active sonar transducer lowered via cable, deployable sonobuoys, a towed Magnetic Anomaly Detector (MAD) tail bird, and lightweight homing torpedoes.
Automated Hovering & Flight Control Systems: Operating over water at night required precise flight controls. Sikorsky integrated an Automatic Flight Control System (AFCS) with automatic transition-to-hover capabilities, allowing the crew to maintain a rock-steady position over a fixed ocean coordinate while dipping sonar cables.

Operational History: Apollo Recoveries, Marine One, and Global Military Service

NASA Apollo Spacecraft Recoveries: The Sea King became an international television icon during the late 1960s and 1970s as the prime recovery helicopter for NASA’s manned spaceflight programs. A famous U.S. Navy SH-3A named Helicopter 66 personally plucked astronauts from the Pacific Ocean following five Apollo splashdowns, including Apollo 11.
Presidential “Marine One” Fleet: Modified VH-3A and VH-3D variants were selected for executive transport duty with Marine Helicopter Squadron One (HMX-1). Decorated in the distinctive “White Top” livery, the Sea King served as the primary presidential transport for eleven consecutive U.S. presidents from John F. Kennedy to Joe Biden.
Vietnam War Combat SAR and Fleet Protection: During the Vietnam War, U.S. Navy SH-3s operated off aircraft carriers in the Gulf of Tonkin, conducting high-risk Combat Search and Rescue (CSAR) missions (“Big Mother”) to pull downed Allied aviators out of hostile jungle terrain and coastal waters.
Westland License Production and Global Service: The design was extensively modified in the United Kingdom by Westland Helicopters as the Westland Sea King, fitted with Rolls-Royce Gnome engines and British radar. Westland Sea Kings saw heavy combat during the 1982 Falklands War, the 1991 Gulf War, and served across dozen of international navies for over 50 years.