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Sloop
A sloop is a sailing vessel with one mast, a fore-and-aft rig, and two sails: a headsail ahead of the mast and a mainsail behind it.
Sloop-of-war
A sloop-of-war was an unrated sailing warship with fewer than 20 guns, used for patrol and escort duties; the French equivalent was called a corvette.
Small waterplane area twin hull
A small waterplane area twin hull (SWATH) is a twin-hull ship with two submerged hulls joined by struts to an upper platform, staying stable in rough seas.
SMS Cap Trafalgar
SMS Cap Trafalgar, also known as Cap Trafalgar, was a German ocean liner converted into an auxiliary cruiser and sunk by HMS Carmania in 1914.
SMS Goeben
SMS Goeben, later Yavuz Sultan Selim, was a German Moltke-class battlecruiser whose 1914 escape to Constantinople helped bring the Ottoman Empire into World War I.
Society for Nautical Research
The Society for Nautical Research is a British learned society and charity, founded in 1910, that promotes research into seafaring, shipbuilding, and nautical subjects.
Society of Naval Architects and Marine Engineers
The Society of Naval Architects and Marine Engineers (SNAME) is an international professional society serving the maritime and offshore industries, founded in 1893 and based in Alexandria, Virginia.
Sohar (port)
Sohar Port is a deep-sea industrial port in northern Oman on the Gulf of Oman, midway between Dubai and Muscat and one of Oman's three major commercial ports.
Sokhna Port
Sokhna Port, also written Ain Sokhna or El Sokhna, is a deep-water commercial port on Egypt's Red Sea coast, 40 km south of the Suez Canal's southern entrance.
SOLAS Convention
The SOLAS Convention (Safety of Life at Sea) is the international treaty setting minimum safety standards for merchant ships, adopted in 1974 and administered by the IMO.
SolidSail
SolidSail is a wind propulsion system for large ships developed by the French shipyard Chantiers de l'Atlantique, using rigid composite sails on tilting carbon masts.
Sōryū-class submarine
The Sōryū-class submarine is a class of twelve diesel-electric attack submarines operated by the Japan Maritime Self-Defense Force since 2009, including the world's first submarines with lithium-ion batteries.
Sound Toll
The Sound Toll (Danish: Øresundstolden) was a transit toll Denmark levied on ships passing through the Sound, collected at Helsingør from about 1429 until 1857.
South Australian
South Australian: 1868 Sunderland-built composite clipper of Devitt & Moore's Adelaide Line, London-South Australia trade; sank off Lundy 14 February 1889; wreck is a Scheduled Monument (NHLE 1465225), distinct from the 1837 barque of the same name.
South Dakota-class battleship (1939)
The South Dakota class (1939) was a group of four United States Navy fast battleships, BB-57 through BB-60, completed in 1942 and serving in the Pacific during World War II.
Sovetsky Soyuz-class battleship
The Sovetsky Soyuz class (Советский Союз, Soviet Union) was a class of Soviet battleships of the late 1930s, of which four were laid down and none completed.
Soviet aircraft carrier Ulyanovsk
Ulyanovsk (Ульяновск) was to have been the Soviet Navy's first true aircraft carrier, laid down in 1988 and scrapped at 20 percent complete in 1992.
Soviet submarine K-129 (1960)
Soviet submarine K-129 (К-129) was a Golf II ballistic missile submarine of the Soviet Navy that sank with all 98 men aboard in the North Pacific in March 1968.
Soviet submarine K-19
Soviet submarine K-19 was the first nuclear-powered ballistic missile submarine of the Soviet Navy, known for a 1961 reactor accident that killed eight crew members.
Soviet submarine K-219
Soviet submarine K-219 was a nuclear-powered ballistic missile submarine that sank northeast of Bermuda on 6 October 1986, three days after an explosion in a missile tube.
Soviet submarine K-278 Komsomolets
Soviet submarine K-278 Komsomolets (К-278 «Комсомолец») was a unique Soviet nuclear submarine with a titanium hull that sank after a fire in 1989, killing 42 of 69 crew.
Soviet submarine K-3 Leninsky Komsomol
Soviet submarine K-3 Leninsky Komsomol, the first Soviet nuclear-powered submarine, passed under the North Pole in 1962, suffered a deadly 1967 fire, and is now a museum ship in Kronstadt.
Sovremenny-class destroyer
The Sovremenny-class destroyer, Project 956 or Sarych, is a Soviet guided-missile destroyer for anti-surface warfare and air defense, its main weapon the SS-N-22 Sunburn missile.
Spanish ship Nuestra Señora de la Santísima Trinidad
Nuestra Señora de la Santísima Trinidad was a Spanish first-rate ship of the line, built at Havana in 1769 and the only four-decked warship of its era.
Spearhead-class expeditionary fast transport
The Spearhead-class expeditionary fast transport, formerly the Joint High Speed Vessel, is a class of United States Navy catamarans carrying troops and cargo at over 35 knots within a theater.
Spinnaker
A spinnaker is a large, light, three-cornered downwind sail set flying from the masthead on a sailing yacht, in symmetric and asymmetric types, first recorded in 1866.
Spruance-class destroyer
The Spruance class was a class of 31 United States Navy destroyers of the 1970s, built primarily for anti-submarine warfare and named for Admiral Raymond Spruance.
Squat effect
The squat effect is the drop in a ship's under-keel clearance when moving through shallow or restricted water, caused by low pressure beneath the hull and increasing with speed.
SS America (1939)
SS America, later USS West Point and Australis, was a United States Lines ocean liner launched in 1939 and wrecked in the Canary Islands in 1994.
SS Andrea Doria
The SS Andrea Doria was an Italian Line passenger liner that sank off Nantucket on 26 July 1956, a day after colliding with the Swedish liner Stockholm.