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The O 10 was a Dutch Navy home service type submarine of 483 tons displacement launched in 1925. She was powered by two Sulzer diesel engines providing a top speed of 12 knots surfaced and 8 knots submerged. She carried a complement of 29 and was armed with one 3.5 inch gun; one machine-gun; two 21 inch bow torpedo tubes; two 17.7 inch bow torpedo tubes; and one 17.7 inch stern torpedo tube.
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The O 11 was a Dutch Navy home service type submarine of 483 tons displacement launched in 1925 and sunk after a collision in 1940, only to be salvaged. At the invasion of Holland during the Second World War she was destroyed to prevent her being taken by the Germans. She was powered by two Sulzer diesel engines providing a top speed of 12 knots surfaced and 8 knots submerged. She carried a complement of 29 and was armed with one 3.5 inch gun; one machine-gun; two 21 inch bow torpedo tubes; two 17.7 inch bow torpedo tubes; and one 17.7 inch stern torpedo tube.
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The O 12 was a Dutch submarine of 546 tons displacement launched in 1930. She was powered by two Sulzer diesel engines providing a top speed of 16 knots surfaced and 8 knots submerged and a range of 5600 km surfaced at 10 knots. She carried a complement of 31 and was armed with two 40 mm anti-aircraft guns; four 21 inch bow torpedo tubes and one 21 inch stern torpedo tube. At the time of the German invasion of Holland during the Second World War, O 12 was being refitted and was consequently destroyed to prevent falling into enemy hands.
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The O 13 was a Dutch submarine of 546 tons displacement launched in 1930. She was powered by two Sulzer diesel engines providing a top speed of 16 knots surfaced and 8 knots submerged and a range of 5600 km surfaced at 10 knots. She carried a complement of 31 and was armed with two 40 mm anti-aircraft guns; four 21 inch bow torpedo tubes and one 21 inch stern torpedo tube.
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The O 14 was a Dutch submarine of 546 tons displacement launched in 1931. She was powered by two Sulzer diesel engines providing a top speed of 16 knots surfaced and 8 knots submerged and a range of 5600 km surfaced at 10 knots. She carried a complement of 31 and was armed with two 40 mm anti-aircraft guns; four 21 inch bow torpedo tubes and one 21 inch stern torpedo tube.
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The O 15 was a Dutch submarine of 546 tons displacement launched in 1931. She was powered by two M.A.N. diesel engines providing a top speed of 16 knots surfaced and 8 knots submerged and a range of 5600 km surfaced at 10 knots. She carried a complement of 31 and was armed with two 40 mm anti-aircraft guns; four 21 inch bow torpedo tubes and one 21 inch stern torpedo tube.
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The O 16 was a Dutch submarine of 896 tons displacement launched in 1936. The O 16 was powered by two M.A.N. diesel engines providing a top speed of 18 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; four 21 inch torpedo tubes in the bow; two 21 inch torpedo tubes in the stern and two 21 inch torpedo tubes on the deck.
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The O 19 was a Dutch mine-laying submarine of 967 tons displacement launched in 1938. The O 19 was powered by two Sulzer diesel engines providing a top speed of 20 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; one 12.7 mm anti-aircraft gun; eight 21 inch torpedo tubes and carried forty mines.
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The O 20 was a Dutch mine-laying submarine of 967 tons displacement launched in 1939. The O 20 was powered by two Sulzer diesel engines providing a top speed of 20 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; one 12.7 mm anti-aircraft gun; eight 21 inch torpedo tubes and carried forty mines.
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The O 21 was a Dutch submarine of 888 tons displacement launched in 1939. The O 21 was powered by two Sulzer diesel engines providing a top speed of 19.5 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; one 12.7 mm anti-aircraft gun; four 21 inch torpedo tubes in the bow; two 21 inch torpedo tubes in the stern and two 21 inch torpedo tubes on the deck.
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O 22
The O 22 was a Dutch submarine of 888 tons displacement launched in 1940. The O 22 was powered by two Sulzer diesel engines providing a top speed of 19.5 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; one 12.7 mm anti-aircraft gun; four 21 inch torpedo tubes in the bow; two 21 inch torpedo tubes in the stern and two 21 inch torpedo tubes on the deck.
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The O 23 was a Dutch submarine of 888 tons displacement launched in 1939. The O 23 was powered by two Sulzer diesel engines providing a top speed of 19.5 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; one 12.7 mm anti-aircraft gun; four 21 inch torpedo tubes in the bow; two 21 inch torpedo tubes in the stern and two 21 inch torpedo tubes on the deck.
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The O 25 was a Dutch submarine of 888 tons displacement launched in 1940 and scuttled soon after following the German invasion of Holland during the Second World War. The O 25 was powered by two Sulzer diesel engines providing a top speed of 19.5 knots surfaced and 9 knots submerged. She carried a complement of 38 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; one 12.7 mm anti-aircraft gun; four 21 inch torpedo tubes in the bow; two 21 inch torpedo tubes in the stern and two 21 inch torpedo tubes on the deck.
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The O 9 was a Dutch Navy home service type submarine of 483 tons displacement launched in 1925. She was powered by two Sulzer diesel engines providing a top speed of 12 knots surfaced and 8 knots submerged. She carried a complement of 29 and was armed with one 3.5 inch gun; one machine-gun; two 21 inch bow torpedo tubes; two 17.7 inch bow torpedo tubes; and one 17.7 inch stern torpedo tube.
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The USS O'Bannon was an American Fletcher Class destroyer of 2050 tons displacement built under the 1940-41 programme. The USS O'Bannon was powered by four Babcock and Wilcox boilers providing a top speed of 36 knots. She carried a complement of 353 and was armed with five 5 inch guns; six 40 mm Bofors anti-aircraft guns; ten 20 mm Oerlikon anti-aircraft guns and ten 21 inch torpedo tubes arranged in two quintuplets.
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The USS O'Bannon is an American Spruance Class guided missile destroyer.
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The USS O'Brien was an American Sims Class destroyer of 1570 tons displacement launched in 1939. The USS O'Brien was powered by four Express oil-burning boilers providing a top speed of 36.5 knots. She carried a complement of 172 and was armed with five 5 inch guns; several smaller guns and twelve 21 inch torpedo tubes arranged in three quadruple arrangements.
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The USS O'Brien was an American Allen M Sumner Class destroyer of 2200 tons displacement launched in 1943. The USS O'Brien was powered by four boilers providing a top speed of 36.5 knots. She carried a complement of 350 and was armed with six 5 inch guns; twelve 40 mm anti-aircraft guns; eleven 20 mm anti-aircraft guns and ten 21 inch torpedo tubes arranged in two quintuplets.
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The USS O'Brien is an American Spruance Class guided missile destroyer. The
O'Brien is a British built, Chilean Oberon class submarine of 1610 tons displacement launched in 1972. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesel engines of 3680 bhp and two electric motors of 6000 shp providing a top speed of 12 knots surfaced and 17 knots dived. She is armed with eight 21 inch torpedo tubes, six in the bow and two astern and carries twenty-two torpedoes.
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The USS O'Hare was an American Gearing Class destroyer of 2400 tons displacement launched in 1945. The USS O'Hare was powered by four boilers providing a top speed of 35 knots. She carried a complement of 350 and was armed with six 5 inch guns; twelve 40 mm anti-aircraft guns; eleven 20 mm anti-aircraft guns and ten 21 inch torpedo tubes arranged in two quintuplets.
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The USS O'Kane is an American Arleigh Burke Class guided missile destroyer of 8300 tons displacement. She is powered by four General Electric LM 2500-30 gas turbines producing 100000 total shaft horsepower and a top speed of over 30 knots. She is manned by a crew of 23 officers and 300 enlisted men and is armed with standard missiles; Harpoon; Tomahawk missiles; six Honeywell Mark-46 torpedoes (from two triple tube mounts); one 5 inch/54 calibre Mk-45 gun and two 20mm Phalanx CIWS.
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The USS O'Neill was an American Bostwick Class escort destroyer of 1240 tons displacement launched in 1943. The USS O'Neill had a top speed of 19 knots and carried a complement of 220. She was armed with three 3 inch dual-purpose guns; two 40 mm anti-aircraft guns; four 20 mm anti-aircraft guns; depth charge throwers and three 21 inch torpedo tubes in a triple mount.
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The USS O'Toole was an American Evarts Class escort destroyer of 1150 tons displacement launched in 1943. The USS O'Toole was powered by diesel engines providing a top speed of 19 knots and carried a complement of 200. She was armed with three 3 inch dual-purpose guns; two 40 mm anti-aircraft guns; four 20 mm anti-aircraft guns and eight depth charge throwers.
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HMS Oakham Castle was a British Castle Class frigate of 1100 tons displacement launched in 1944. She carried a crew of 96, and had a top speed of 16.5 knots. Armaments consisted of one 4 inch calibre Mk XIX gun; two 40 mm anti-aircraft guns in a twin arrangement; two 20 mm guns in a twin arrangement; one squid three-barrelled anti-ship mortar; two depth charge launchers and fifteen depth charges.
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The USS Oakland was an American San Diego Class light cruiser of 6000 tons displacement launched in 1942. The USS Oakland had a top speed of 35 knots and carried a complement of 597. She was armed with twelve 5 inch dual-purpose guns; twenty-eight 40 mm anti-aircraft guns; twelve 20 mm anti-aircraft guns and eight 21 inch torpedo tubes arranged in two quads.
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HMS Oakley was a British No 2 Type Hunt Class destroyer of 1050 tons displacement launched in 1942 as HMS Tickham. HMS Oakley was powered by two Admiralty 3-drum type boilers providing a top speed of 27 knots and carried a complement of 146. She was armed with six 4 inch anti-aircraft guns; one 2 pdr gun and two 20 mm anti-aircraft guns.
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Oakum is a loose fibre obtained by unravelling old rope. It is used especially for caulking seams in wooden ships. Unravelling old ropes, a practice known as picking oakum, was a common employment in 19th century workhouses and prisons.
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HMS Obdurate was a British Onslow Class destroyer of 1540 tons displacement launched in 1942. HMS Obdurate was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with four 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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HMS Obedient was a British Onslow Class destroyer of 1540 tons displacement launched in 1942. HMS Obedient was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with four 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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HMS Oberon was a British Oberon Class submarine of 1311 tons displacement launched in 1926. She was armed with one 4-inch gun; two machine-guns; six 21-inch torpedo tubes in the bow and two 21-inch torpedo tubes in the stern. She had a top speed of 15 knots on the surface, 9 knots submerged and carried a complement of 54.
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Oblique sailing refers to a ship's movement on a course that is not due north, south, east, or west.
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The Oboro was a Japanese Amagiri type Hubuki Class destroyer of 1700 tons displacement launched in 1930. The Oboro was powered by four Kanpon oil-fired boilers providing a top speed of 34 knots and carried a complement of 197. She was armed with six 5 inch guns; four anti-aircraft machine-guns and nine 21 inch torpedo tubes arranged in three triple mountings.
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The name Ocean for British warships came into use following the capture of the French ship Ocean at the Battle of Lagos Bay in 1759.
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HMS Ocean was a British first-class battleship of 12950 tons displacement launched in 1898.
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HMS Ocean was a British Colossus Class light fleet aircraft carrier of 13190 tons displacement launched in 1944. HMS Ocean was powered by four Admiralty 3-drum type boilers providing a top speed of 25 knots. She carried a crew of 850 plus aircrew and between 39 and 44 aircraft. Armaments comprised four 3-pounder guns, twenty-four 2-pounder pompoms and nineteen 40 mm anti-aircraft guns. *Ocean IV
HMS Ocean is a British aircraft carrier built based on the design of the Invincible Class aircraft carrier with a modified superstructure, after the UK Ministry of Defence issued an invitation to tender in July 1987 for an amphibious helicopter carrier for the Royal Navy. She has a displacement of 20500 tons. The primary role of HMS Ocean is to achieve the rapid landing of an assault force by helicopter and landing craft.
The ship carries a crew of 255, an aircrew of 206 and 480 marines. An additional 320 marines could be accommodated in a short term emergency. HMS Ocean is capable of transporting and sustaining an embarked military force of up to 800 men equipped with artillery, vehicles and stores. The ship is not designed to land heavy tanks. HMS Ocean has full facilities for twelve EH101 Merlin and six Lynx helicopters, and landing and refuelling facilities for Chinook helicopters. Twenty Sea Harriers could be carried but not supported. The flight deck is 170 meters long by 32.6 meters wide and there are two aircraft lifts. There are four LCVP Mk 5 vehicle/personnel landing craft on davits. HMS Ocean has capacity for 40 vehicles. Propulsion is provided by two Crossley Pielstick 16 PC2.6 V 200 medium speed diesel engines, rated at 23,904 hp, with two independent shafts and a five-bladed fixed pitch propeller. A 450 kW KaMeWa bow thruster is fitted. The maximum speed is 18 knots and the range is 8,000 miles.
HMS Ocean is equipped with the BAE Systems ADAWS 2000 combat data system, Link 11, 14 and 16 communications, a Matra Marconi SATCOM 1D satellite communications system, and a Merlin computer link. The ADAWS 2000 combat data system, installed on both HMS Ocean and on the Royal Navy's Landing Platform Dock LPD assault ship, is compatible with the ships of the Royal Navy' s front line fleet. The self protection combat systems include four Oerlikon/BAE twin 30mm guns together with three Raytheon/General Dynamics Phalanx Mk 15 close-in weapon systems.
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HMS Ocelot is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1962. HMS Ocelot is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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The Ochakov was a Russian leningrad Class destroyer of 2900 tons displacement launched in 1938. The Ochakov was powered by 3-drum type oil-burning boilers providing a top speed of 36 knots. She was armed with five 5.1 inch guns; two 3 inch anti-aircraft guns; two 37 mm anti-aircraft guns; four depth charge throwers and six 21 inch torpedo tubes arranged in two triples.
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HMS Octavia was a British Algerine Class minesweeper of 950 tons displacement launched in 1942. HMS Octavia was powered by two 3-drum type boilers providing a top speed of 16.5 knots. She carried a peacetime complement of 85 and between 104 and 138 in war. For defence she was armed with one 4-inch dual-purpose gun; four 40 mm anti-aircraft guns and two depth charge throwers.
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USS Odax was an American Corsair Class submarine of 1570 tons displacement launched in 1945. The USS Odax was armed with one 5 inch gun; two 40 mm anti-aircraft guns and ten 21 inch torpedo tubes.
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The Odin (formerly the Osterreich) was a German patrol vessel of 496 tons displacement launched between 1912 and 1921 as a trawler, and acquired by the German navy for military use in 1937. She had a top speed of 10 knots, carried a complement of 38 and was armed with one 3.5 inch gun and three 1 pdr anti-aircraft guns.
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The Odin was a Norwegian torpedo boat of 597 tons displacement launched in 1939. The Odin was powered by three water-tube oil-fired boilers providing a top speed of 32 knots and carried a complement of 72. She was armed with three 4 inch guns; one 40 mm anti-aircraft gun; two machine-guns; four depth charge throwers and two 21 inch torpedo tubes arranged as a pair.
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HMS Odin is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1960. HMS Odin is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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HMS Odzani was a British River Class frigate of 1460 tons displacement launched in 1943. HMS Odzani was powered by two Admiralty 3-drum type boilers providing a top speed of 20 knots. She carried a complement of 140 and was armed with two 4-inch dual-purpose guns; ten 20 mm anti-aircraft guns and one Hedgehog multiple spigot mortar.
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HMS Offa was a British Onslow Class destroyer of 1540 tons displacement launched in 1941. HMS Offa was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with two 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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The USS Ogden was an American frigate of 1430 tons displacement launched in 1943 and lent to the Soviet Navy during the Second World War. The USS Ogden had a top speed of 20 knots and carried a complement of 194. She was armed with three 3 inch dual-purpose guns; four 40 mm anti-aircraft guns and four depth-charge throwers.
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The Oite was a Japanese Kamikaze Class destroyer of 1270 tons displacement launched in 1924. The Oite was powered by four Kanpon oil-fired boilers providing a top speed of 34 knots and a range of 6400 km at 15 knots and carried a complement of 148. She was armed with four 4.7 inch guns; two anti-aircraft machine-guns and six 21 inch torpedo tubes arranged in three pairs.
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The Ojibwa (formerly the Onyx) is a Canadian Oberon Class patrol submarine of 2030 tons displacement, launched in 1964. She has a speed of 12 knots surfaced; 17 knots dived and 10 knots snorkelling and a range of 9000 miles surfaced at 12 knots. She carries a crew of 65 including seven officers. She is equipped with eight 21 inch torpedo tubes (six at the bow, two in the stern), and carries twenty Gould Mk 48 Mod 4 dual purpose torpedoes.
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The Okanagan is a Canadian Oberon Class patrol submarine of 2030 tons displacement, launched in 1964. She has a speed of 12 knots surfaced; 17 knots dived and 10 knots snorkelling and a range of 9000 miles surfaced at 12 knots. She carries a crew of 65 including seven officers. She is equipped with eight 21 inch torpedo tubes (six at the bow, two in the stern), and carries twenty Gould Mk 48 Mod 4 dual purpose torpedoes.
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The Okikaze was a Japanese Akikaze Class destroyer of 1215 tons displacement launched in 1919. The Okikaze was powered by four Kanpon oil-fired boilers providing a top speed of 34 knots and carried a complement of 148. She was armed with four 4.7 inch guns; two anti-aircraft machine-guns and six 21 inch torpedo tubes arranged in three pairs.
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The USS Okinawa is an American Iwo Jima Class amphibious assault ship of 11000 tons light displacement launched in 1961. The USS Okinawa is powered by two Combustion Engineering boilers providing a top speed of 23 knots and carries a crew of 686 including 48 officers plus 1746 troops and 1500 tons of aviation fuel and twenty CH-46D/E Sea Knight or eleven CH-53D Sea Stallion helicopters or four AV-8B Harrier aircraft and helicopters. Armaments consist of two Raytheon GMLS Mk 25 octuple surface-to-air missile launchers taking the Sea Sparrow missile; four USN 3 inch/50 Mk 33 guns in two twin arrangements and two General Electric/General Dynamics 20 mm 6-barrelled Vulcan Phalanx Mk 15 guns.
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The Okinosima was a Japanese minelayer of 4400 tons displacement launched in 1935. The Okinosima was powered by four Kanpon boilers providing a top speed of 20 knots and was armed with four 5.5 inch guns and four machine-guns.
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The USS Oklahoma was an American Nevada Class battleship of 29000 tons displacement launched in 1914 and sunk by the Japanese in December 1941 during the Second World War. The USS Oklahoma was powered by six Bureau Express boilers providing a top speed of 20.5 knots. She carried a complement of 1301 and three aircraft. She was armed with ten 14 inch guns; twelve 5 inch guns; eight 5 inch anti-aircraft guns; four 3 pdr saluting guns and eight machine-guns.
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The USS Oklahoma City was an American Cleveland Class light cruiser of 10000 tons displacement launched in 1944. The USS Oklahoma City was powered by eight Babcock and Wilcox boilers providing a top speed of 33 knots and carried a complement of 900 and three aircraft. She was armed with twelve 6 inch guns; twelve 5 inch dual-purpose guns arranged in pairs; twenty-four 40 mm anti-aircraft guns and nineteen 20 mm anti-aircraft guns.
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The Oktiabrskata-Revolutia (formerly the Gangut) was a Russian battleship of 23256 tons displacement launched in 1911. The Oktiabrskata-Revolutia was powered by twenty-five Yarrow boilers providing a top speed of 23 knots and carried a complement of 1125 and one aircraft. She was armed with twelve 12 inch guns; sixteen 4.7 inch guns; ten 3 inch anti-aircraft guns; one 3 pdr gun; eight machine-guns and four 18 inch submerged torpedo tubes. She was later renamed the Gangut.
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The Ol was a Japanese Kuma Class second class cruiser of 5100 tons displacement launched in 1920. The Ol was powered by ten Kanpon oil-fired boilers and two Kanpon mixed oil and coal-fired boilers providing a top speed of 33 knots and a range of 13600 km at 10 knots. She carried a complement of 439 and after 1927 one aircraft. Armaments consisted of seven 5.5 inch guns; two 3 inch guns; two machine-guns and eight 21 inch torpedo tubes. Eighty mines could also be carried.
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The Olav Tryggvason was a Norwegian mine layer of 1596 tons displacement launched in 1933. The Olav Tryggvason was powered by two sets of Sulzer diesel engines supported by electric motors for cruising, providing a top speed of 20 knots and a range of 4800 km at 14 knots. The Olav Tryggvason carried a complement of 128 and was armed with four 3.7 inch guns; one 3 inch anti-aircraft gun; two 3 pdr guns; two machine-guns and carried 280 mines.
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The USS Oldendorf is an American Spruance Class guided missile destroyer.
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HMS Olympus was a British Olympus Class submarine of 1475 tons displacement launched in 1928 and sunk during the Second World War. She was armed with one 4-inch gun; two machine-guns; six 21-inch torpedo tubes in the bow and two 21-inch torpedo tubes in the stern. She had a top speed of 17.5 knots on the surface, 9 knots submerged and carried a complement of 50.
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The USS Omaha was an American Omaha Class light cruiser of 7050 tons displacement launched in 1920. The USS Omaha was powered by twelve Yarrow oil-burning boilers providing a top speed of 34 knots and a range of 16000 km at 15 knots. She carried a complement of 458; four aircraft and was armed with twelve 6 inch guns; four 3 inch anti-aircraft guns; two 3 pdr saluting guns; eight anti-aircraft machine-guns and six torpedo tubes arranged in two triples.
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The USS Ommaney Bay was an American Casablanca Class light fleet aircraft carrier of 6730 tons displacement launched around 1944 and sunk during the Second World War. The USS Ommaney Bay had a top speed of 18 knots and carried a complement of 800 and about 30 aircraft. She was armed with one 5 inch gun and twenty-four 20 mm anti-aircraft guns.
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The Ondina was an Italian Sirena Class coastal submarine of 590 tons displacement launched in 1933. The Ondina was powered by diesel engines providing a top speed of 14 knots surfaced and 8.5 knots submerged and could dive to a depth of 50 fathoms. She carried a complement of 41 and was armed with one 3.9 inch gun; two 13 mm anti-aircraft guns and six 21 inch torpedo tubes.
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The Ondine was a French Normand-Fenaux type Sirene Class submarine of 576 tons displacement surfaced launched in 1927. The Ondine was powered by two sets of 4-cycle Vickers-Normand diesel engines providing a top speed of 14 knots surfaced and electric motors providing a top speed of 7.5 knots submerged and a range of 3200 km at 10 knots on the surface, and carried a complement of 40. She could dive to a depth of 45 fathoms. Armaments consisted of one 3-inch anti-aircraft gun; two machine-guns and seven 21.7 inch torpedo tubes. She was lost following a collision with a Greek steamer in October 1928.
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The Ondine was a French Diane Class submarine of 571 tons displacement surfaced launched in 1931. The Ondine was powered by two diesel engines providing a top speed of 14 knots surfaced and an electric motor providing a speed of 9 knots submerged and a range of 4800 km surfaced. She carried a complement of 48 and armaments consisted of one 3 inch anti-aircraft gun; one machine-gun and eight 21.7 inch torpedo tubes.
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The Onice was an Italian Gemma Class coastal submarine of 615 tons displacement launched in 1936. The Onice was powered by diesel engines providing a top speed of 14 knots surfaced and 8.5 knots submerged and could dive to a depth of 50 fathoms. Armaments consisted of one 3.9 inch gun; two 13 mm anti-aircraft guns and six 21 inch torpedo tubes.
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The Onondaga is a Canadian Oberon Class patrol submarine of 2030 tons displacement, launched in 1964. She has a speed of 12 knots surfaced; 17 knots dived and 10 knots snorkelling and a range of 9000 miles surfaced at 12 knots. She carries a crew of 65 including seven officers. She is equipped with eight 21 inch torpedo tubes (six at the bow, two in the stern), and carries twenty Gould Mk 48 Mod 4 dual purpose torpedoes.
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HMS Onslaught was a British Onslow Class destroyer of 1540 tons displacement launched in 1941 as HMS Pathfinder. HMS Onslaught was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with two 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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HMS Onslaught is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1960. HMS Onslaught is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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HMS Onslow was a British Onslow Class destroyer of 1540 tons displacement launched in 1941. HMS Onslow was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with four 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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The Onslow is an Australian Ran Oberon class submarine of 2030 tons displacement surfaced. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesels of 3680 bhp and two electric motors of 6000 shp giving a top speed of 17 knots submerged. She is armed with a McDonnell Douglas Sub Harpoon ship-to-ship missile system, six 21 inch bow torpedo tubes taking the Gould Mk 48 Mod 4 dual purpose wire-guided torpedo, and carries a total of 20 ship-to-ship missiles and torpedoes. She carries a crew of eight officers and 56 other ranks.
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The Ontario was a British-built Canadian cruiser of 8000 tons displacement built as HMS Minotaur and launched in 1943, before being presented to the Royal Canadian Navy upon completion in 1945. The Ontario was powered by four Admiralty 3-drum type boilers providing a top speed of 31.5 knots and carried a complement of 900. She was armed with nine 6-inch guns; ten 4-inch dual-purpose guns; nineteen 2-pdr guns; thirteen 40 mm anti-aircraft guns and six 21 inch torpedo tubes.
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HMS Onyx was a British Algerine Class minesweeper of 950 tons displacement launched in 1942. HMS Onyx was powered by two 3-drum type boilers providing a top speed of 16.5 knots. She carried a peacetime complement of 85 and between 104 and 138 in war. For defence she was armed with one 4-inch dual-purpose gun; four 40 mm anti-aircraft guns and two depth charge throwers.
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HMS Onyx is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1966. HMS Onyx is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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An oomiak is a long, broad boat used by the Innuit people for conveying their families and property during summer excursions and migrations. The oomiak is furnished with seats and propelled by oars. Parry's expedition of 1821 to 1823 reported encountering an oomiak which was 25 feet long, 8 feet wide and was carrying 21 women and children.
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An open hawse is a hawse in which the cables are parallel or slightly divergent.
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The Opiniatre was a French Le Hardi Class destroyer (torpilleurs) of 1772 tons displacement launched in 1940. The Opiniatre had a top speed of 37 knots, a range of 9600 km at 15 knots and carried a complement of 175. Armaments consisted of six 5.1-inch guns; four 37 mm anti-aircraft guns; four 13 mm anti-aircraft guns and seven 21.7 inch torpedo tubes.
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The Opitni was a Russian Opitni Class destroyer of about 2050 tons displacement launched during the Second World War as the Serge Orjonikidze. The Opitni was powered by 3-drum type oil-fired boilers providing a top speed of 36 knots and was armed with four 5.1 inch guns; three 3 inch anti-aircraft guns; two 45 mm anti-aircraft guns; four 37 mm anti-aircraft guns; four machine-guns and six 21 inch torpedo tubes.
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HMS Opossum was a British modified Black Swan Class sloop of 1430 tons displacement launched in 1944. HMS Opossum was powered by two 3-drum type boilers providing a top speed of 20 knots and carried a complement of 192. She was armed with six 4 inch dual purpose guns and eight 2 pdr anti-aircraft guns.
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HMS Opossum is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1963. HMS Opossum is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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The USS Opponent was an American Admirable Class minesweeper of 625 tons displacement launched in 1943. The USS Opponent was powered by diesel engines providing a top speed of 14.5 knots and carried a complement of 104. She was armed with one 3 inch dual-purpose gun and four 40 mm anti-aircraft guns.
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HMS Opportune was a British Onslow Class destroyer of 1540 tons displacement launched in 1942. HMS Opportune was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with two 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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HMS Opportune is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1964. HMS Opportune is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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The USS Oracle was an American Auk Class minesweeper of 890 tons displacement launched in 1942. The USS Oracle was powered by diesel engines providing a top speed of 18 knots and carried a complement of 105. She was armed with one 3 inch dual-purpose gun and two 40 mm anti-aircraft guns.
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HMS Oracle is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1961. HMS Oracle is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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The Orage was a French Simoun Class destroyer (torpilleurs) of 1319 tons displacement launched in 1924. The Orage had a top speed of 33 knots and a range of 4800 km at 15 knots and carried a complement of 138. She was armed with four 5.1 inch guns; two 37 mm anti-aircraft guns and six 21.7 inch torpedo tubes arranged in two triples.
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The USS Orange was an American frigate of 1430 tons displacement launched in 1943. The USS Orange had a top speed of 20 knots and carried a complement of 194. She was armed with three 3 inch dual-purpose guns; four 40 mm anti-aircraft guns and four depth-charge throwers.
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The Orao was a Yugoslavian minelayer of 330 tons displacement launched in 1918. The Orao was powered by oil-fired boilers providing a top speed of 15 knots and carried a complement of 71. She was armed with two 3.9 inch anti-aircraft guns and four 3 pdr guns. During the Second World War the Orao was captured by the Italians who used her under the name Vergada before she was later returned to Yugoslavia.
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HMS Orcadia was a British Algerine Class minesweeper of 950 tons displacement launched in 1944. HMS Orcadia was powered by two 3-drum type boilers providing a top speed of 16.5 knots. She carried a peacetime complement of 85 and between 104 and 138 in war. For defence she was armed with one 4-inch dual-purpose gun; four 40 mm anti-aircraft guns and two depth charge throwers.
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The USS Ordronaux was an American Buchanan Class destroyer of 1630 tons displacement launched in 1942. The USS Ordronaux was powered by four Babcock and Wilcox oil-burning boilers providing a top speed of 36.5 knots. She carried a complement of 210 and was armed with four 5 inch guns; four 40 mm Bofors anti-aircraft guns; seven 20 mm Oerlikon anti-aircraft guns and five 21 inch torpedo tubes arranged in a quintuple arrangements.
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The Oreade was a French Diane Class submarine of 571 tons displacement surfaced launched in 1932. The Oreade was powered by two diesel engines providing a top speed of 14 knots surfaced and an electric motor providing a speed of 9 knots submerged and a range of 4800 km surfaced. She carried a complement of 48 and armaments consisted of one 3 inch anti-aircraft gun; one machine-gun and eight 21.7 inch torpedo tubes.
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The USS Oregon City was an American Oregon City Class heavy cruiser of 13700 tons displacement launched in 1945. The USS Oregon City was powered by Babcock and Wilcox oil-fired boilers providing a top speed of 33 knots and carried a complement of 1715 and four aircraft. She was armed with nine 8 inch guns; twelve 5 inch guns; forty-eight 40 mm anti-aircraft guns and forty 20 mm anti-aircraft guns.
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The Orelia was a British-built Chilean Serrano Class destroyer of 1090 tons displacement launched in 1928. The Orelia was powered by three Thornycroft 3-drum type oil-fired boilers providing a top speed of 35 knots. She carried a complement of 130 and was armed with three 4.7 inch guns; one 3 inch anti-aircraft gun; three machine-guns; two depth charge throwers; six 21-inch torpedo tubes arranged in two triples and had provision for carrying mines.
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HMS Orestes was a British Algerine Class minesweeper of 950 tons displacement launched in 1942. HMS Orestes was powered by two 3-drum type boilers providing a top speed of 16.5 knots. She carried a peacetime complement of 85 and between 104 and 138 in war. For defence she was armed with one 4-inch dual-purpose gun; four 40 mm anti-aircraft guns and two depth charge throwers.
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The USS Oriole is an American Osprey Class mine hunter. The Osprey Class ships are the world's largest glass reinforced plastic (GRP) ships and are the first United States Navy ships designed solely for mine hunting. The technique used to locate mines is by high definition sonar and the mines are neutralised with a remotely controlled underwater vehicle. The platform has been designed with exceptionally low magnetic and acoustic signatures to protect against mine detonations during mine hunting operations. The ship has two Isotta Franschini ID 36 SS 8V AM diesel engines which provide 1,600 hp and drive two Voith Schneider cycloidal propellers for increased manoeuvrability. The non magnetic diesel engines are similar to those used in the US Navy's Avenger Class Mine Countermeasures Vessels. The three diesel generators are Isotta Franschini ID 36. The machinery is acoustically isolated and suspended from the main deck in glass reinforced plastic cradles. When an undersea explosion occurs the isolated machinery remains unaffected. For defence, the ship has two 12.7 mm machine-guns.
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The Orion was a French Diane Class submarine of 571 tons displacement surfaced launched in 1931. The Orion was powered by two diesel engines providing a top speed of 14 knots surfaced and an electric motor providing a speed of 9 knots submerged and a range of 4800 km surfaced. She carried a complement of 48 and armaments consisted of one 3 inch anti-aircraft gun; one machine-gun and eight 21.7 inch torpedo tubes.
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HMS Orion was a British light cruiser of 7215 tons displacement of the Leander Class launched in 1932, that saw action during the Second World War. She was armed with eight 6-inch guns, eight 4-inch anti-aircraft guns, four 3-pounder anti-aircraft guns, ten smaller guns and eight 21 inch torpedo tubes arranged in two quadruples. She was powered by four Admiralty 3-drum type oil boilers providing a top speed of 32.5 knots. She carried a crew of 550 and two aircraft.
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The Orion is an Australian Ran Oberon class submarine of 2030 tons displacement surfaced. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesels of 3680 bhp and two electric motors of 6000 shp giving a top speed of 17 knots submerged. She is armed with a McDonnell Douglas Sub Harpoon ship-to-ship missile system, six 21 inch bow torpedo tubes taking the Gould Mk 48 Mod 4 dual purpose wire-guided torpedo, and carries a total of 20 ship-to-ship missiles and torpedoes. She carries a crew of eight officers and 56 other ranks.
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The Orione was an Italian Orsa Class destroyer of 855 tons displacement, launched in 1937 and originally classed as an escort vessel. The Orione was powered by two 3-drum type boilers providing a top speed of 28 knots, and carried a complement of about 90. She was armed with two 3.9 inch guns; eight machine-guns; six depth charge throwers and four 18 inch torpedo tubes arranged in pairs.
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The USS Oriskany was an American Essex Class fleet aircraft carrier of 27100 tons displacement launched in 1945. The USS Oriskany was powered by eight Babcock and Wilcox boilers providing a top speed of 33 knots. She carried a complement of 2900 and normally 82 aircraft though up to 103 could be carried. She was armed with ten 5 inch guns; seventy-two 40 mm anti-aircraft guns and fifty-two 20 mm anti-aircraft guns mounted in quads.
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HMCS Orkney was a Canadian frigate of 1445 tons displacement launched in 1943. HMCS Orkney was powered by two Admiralty 3-drum type boilers providing a top speed of 20 knots and carried a complement of 140. She was armed with two 4 inch dual-purpose guns and ten 20 mm anti-aircraft guns.
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HMS Orkney is a British Island Class offshore patrol vessel of 925 tons displacement. HMS Orkney is powered by two Ruston RKCM 12-cylinder diesel engines providing a top speed of 16.5 knots and a range of 7000 miles at 12 knots. She carries a crew of 39 and is armed with a Bofors 40 mm Mk 3 gun; a DES/Oerlikon 30 mm/75 Mk 1 gun and two FN 7.62 mm machine-guns.
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The Orla (formerly HMS Swift) is an Irish Peacock Class patrol vessel of 712 tons displacement, fully loaded, launched in 1984 and bought by the Irish government in 1988. She is powered by two Crossley Pielstick 18 PA6V 280 diesels rated at 14000 hp providing a top speed of 25 knots and a range of 4000 km at 17 knots. She carries a crew of 29, including six officers. She is armed with one 76 mm/62 OTO Melara compact gun; two 12.7 mm machine-guns and four 7.62 mm machine-guns.
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The USS Orleck was an American Gearing Class destroyer of 2400 tons displacement launched in 1945. The USS Orleck was powered by four boilers providing a top speed of 35 knots. She carried a complement of 350 and was armed with six 5 inch guns; twelve 40 mm anti-aircraft guns; eleven 20 mm anti-aircraft guns and ten 21 inch torpedo tubes arranged in two quintuplets.
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The Ornen was a Danish T4 Class torpedo boat of 290 tons displacement launched in 1934. The Ornen had a top speed of 27.5 knots and carried a compliment of 55. She was armed with two 88 mm Bofors M28 guns; two 20 mm anti-aircraft guns; two 8 mm anti-aircraft guns; two depth charge throwers and six 18-inch torpedo tubes. she was also equipped for mine laying.
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The Orphee was a French Diane Class submarine of 571 tons displacement surfaced launched in 1931. The Orphee was powered by two diesel engines providing a top speed of 14 knots surfaced and an electric motor providing a speed of 9 knots submerged and a range of 4800 km surfaced. She carried a complement of 48 and armaments consisted of one 3 inch anti-aircraft gun; one machine-gun and eight 21.7 inch torpedo tubes.
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The Orsa was an Italian Orsa Class destroyer of 855 tons displacement, launched in 1937 and originally classed as an escort vessel. The Orsa was powered by two 3-drum type boilers providing a top speed of 28 knots, and carried a complement of about 90. She was armed with two 3.9 inch guns; eight machine-guns; six depth charge throwers and four 18 inch torpedo tubes arranged in pairs.
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The Oruc Reis was a British-built Turkish submarine of 683 tons displacement launched in 1940. The Oruc Reis had a top speed of 13.75 knots surface and 9 knots submerged. She was armed with one 3 inch gun; one machine-gun; four 21 inch torpedo tubes in the bow and one 21 inch torpedo tube in the stern.
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HMS Orwell was a British Onslow Class destroyer of 1540 tons displacement launched in 1942. HMS Orwell was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with four 4.7 inch guns; four 2 pdr pom-pom guns; eight 20 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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The Orzel was a Polish submarine of 1110 tons displacement launched in 1938 and lost in June 1940 during the Second World War. The Orzel was powered by two Sulzer diesel engines providing a top speed of 19 knots surfaced and 9 knots submerged. She carried a complement of 56 and was armed with one 3.5 inch gun; two 40 mm anti-aircraft guns; eight 21 inch torpedo tubes and was fitted for mine laying.
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The Oscar II was a Swedish coastal defence ship of 4320 tons displacement launched in 1905. the Oscar II was powered by ten Yarrow boilers providing a top speed of 18 knots and a range of 4720 km at 10 knots. She carried a complement of 339 and was armed with two 8.3 inch guns; eight 6 inch guns; four 57 mm anti-aircraft guns; two 25 mm anti-aircraft guns; two machine-guns and was fitted for mine laying.
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HMCS Oshawa was a Canadian minesweeper of 950 tons displacement launched in 1943. HMCS Oshawa was powered by two 3-drum type boilers providing a top speed of 15 knots and carried a complement of 104. She was armed with one 4 inch dual-purpose gun; four 20 mm Oerlikon guns; one hedgehog anti-ship mortar and two depth charge throwers.
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The Osio was a Japanese Asasio Class destroyer of 1500 tons displacement launched in 1937. The Osio was powered by three Kanpon boilers providing a top speed of 34 knots and carried a complement of 190. She was armed with six 5 inch guns; two machine-guns and eight 21 inch torpedo tubes.
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HMS Osiris was a British Olympus Class submarine of 1475 tons displacement launched in 1928. She was armed with one 4-inch gun; two machine-guns; six 21-inch torpedo tubes in the bow and two 21-inch torpedo tubes in the stern. She had a top speed of 17.5 knots on the surface, 9 knots submerged and carried a complement of 50.
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HMS Osiris is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1962. HMS Osiris is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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The Oslo was a British-built Norwegian destroyer of 1730 tons displacement launched in 1945 as HMS Crown and acquired by Norway in 1946. The Oslo was powered by two 3-drum type boilers providing a top speed of 36 knots and carried a complement of 235. She was armed with four 4.5 inch dual-purpose guns; four 40 mm anti-aircraft guns; two 20 mm anti-aircraft guns and four 21 inch torpedo tubes arranged in a quad.
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The USS Osprey is an American Osprey Class mine hunter. The Osprey Class ships are the world's largest glass reinforced plastic (GRP) ships and are the first United States Navy ships designed solely for mine hunting. The technique used to locate mines is by high definition sonar and the mines are neutralised with a remotely controlled underwater vehicle. The platform has been designed with exceptionally low magnetic and acoustic signatures to protect against mine detonations during mine hunting operations. The ship has two Isotta Franschini ID 36 SS 8V AM diesel engines which provide 1,600 hp and drive two Voith Schneider cycloidal propellers for increased manoeuvrability. The non magnetic diesel engines are similar to those used in the US Navy's Avenger Class Mine Countermeasures Vessels. The three diesel generators are Isotta Franschini ID 36. The machinery is acoustically isolated and suspended from the main deck in glass reinforced plastic cradles. When an undersea explosion occurs the isolated machinery remains unaffected. For defence, the ship has two 12.7 mm machine-guns.
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The Ossoaviakhim was a Russian patrol vessel converted from the torpedo boat Vnimatelni launched in 1905. The Ossoaviakhim had a displacement of 375 tons and carried a complement of 69. She had a top speed of 28 knots and was armed with two 3 inch guns and four machine-guns.
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HMS Ossory was a British Algerine Class minesweeper of 950 tons displacement launched in 1944. HMS Ossory was powered by two 3-drum type boilers providing a top speed of 16.5 knots. She carried a peacetime complement of 85 and between 104 and 138 in war. For defence she was armed with one 4-inch dual-purpose gun; four 40 mm anti-aircraft guns and two depth charge throwers.
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The USS Osterhaus was an American Bostwick Class escort destroyer of 1240 tons displacement launched in 1943. The USS Osterhaus had a top speed of 19 knots and carried a complement of 220. She was armed with three 3 inch dual-purpose guns; two 40 mm anti-aircraft guns; four 20 mm anti-aircraft guns; depth charge throwers and three 21 inch torpedo tubes in a triple mount.
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The Ostia was an Italian minelayer of 615 tons displacement launched in 1925. The Ostia was powered by coal-burning boilers providing a top speed of 15 knots. She carried 80 mines and was armed with two four inch guns; one 3 inch anti-aircraft gun and two machine-guns.
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The Ostro was an Italian Turbine Class destroyer of 1073 tons displacement launched in 1928. The Ostro was powered by three Express boilers with super heaters providing a top speed of 36 knots and carried a complement of 142. She was armed with four 4.7-inch guns; four 37 mm anti-aircraft guns; two 13 mm anti-aircraft guns and six 21-inch torpedo tubes arranged in two triples.
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The Ahmed Yani (formerly the Van Nes) is an Indonesian Van Spiejk Class frigate launched in 1966 and transferred to the Indonesian navy from the Netherlands in the mid-1980s. She has a displacement of 2225 tons and is powered by two Werkspoor/English Electric double reduction geared turbines rated at 30000 shp providing a top speed of 28.5 knots and a maximum range of 7200 km at 12 knots. She is manned by a crew of 180. Armaments consist of two Short Bros Seacat anti-aircraft quad missile launchers; one OTO Melara 76 mm/62 compact dual-purpose gun and six 324 mm Mk 32 torpedo tubes arranged in two triple arrangements, firing the Honeywell Mk 46 anti-submarine torpedo. A Westland Westland Wasp helicopter is also carried.
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The Otama is an Australian Ran Oberon class submarine of 2030 tons displacement surfaced. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesels of 3680 bhp and two electric motors of 6000 shp giving a top speed of 17 knots submerged. She is armed with a McDonnell Douglas Sub Harpoon ship-to-ship missile system, six 21 inch bow torpedo tubes taking the Gould Mk 48 Mod 4 dual purpose wire-guided torpedo, and carries a total of 20 ship-to-ship missiles and torpedoes. She carries a crew of eight officers and 56 other ranks.
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The Otaria was an Italian Glauco Class ocean-going submarine of 863 tons displacement launched in 1935. The Otaria was powered by two sets of Fiat diesel engines providing a top speed of 17 knots surfaced and 8.5 knots submerged. She carried a complement of 48 and was armed with two 3.9 inch guns; two 13 mm anti-aircraft guns and eight 21 inch torpedo tubes.
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Otobreda is an Italian manufacturer of naval weapons systems, field artilleries, armoured vehicles, gun turrets and ammunition. Otobreda is also specialised in the design and production of small calibre automatic guns.
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The Otobreda 127/54 C is a compact dual-purpose 127 mm gun mount, intended as a main armament for frigates and destroyers, providing point defence against attacking aircraft, shore bombardments and anti-ship capability. The loader drums are automatically fed through two hoists manually loaded in the ammunition magazine.
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The Otobreda 127/54 LW is a 127mm calibre lightweight, compact, automatic gun mount intended to confront surface, coastal and aircraft targets. The gun can fire all standard 5 inch ammunition, including guided rounds and a newly developed extended-range ammunition. The 40 ready-to-use rounds are loaded in two modular automatic feeding magazines. The gun mount includes a STEALTH cupola.
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The Otobreda 76/62 SR is a NATO multi-role naval gun intended as an anti-missile, anti-aircraft weapon system with anti-ship and NGS capability. The gun in the anti-aircraft role can use special pre-fragmented ammunition. For surface roles, special types of armour piercing ammunition are available.
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The Otori was a Japanese Otori Class torpedo boat of 595 tons displacement launched in 1935. The Otori was powered by Kanpon oil-fired boilers providing a top speed of 28 knots. She was armed with three 4.7 inch guns; one machine-gun and three 21 inch torpedo tubes arranged in a triple.
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The Otra was a Norwegian mine sweeper of 320 tons displacement launched in 1939. The Otra had a top speed of 13.5 knots and carried a complement of 23. She was armed with one 40 mm anti-aircraft gun and two 12.7 mm guns.
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The SS Otranto was built as a British merchant ship for the Orient Steam Navigation Co. in 1909, and converted during the Great War into an armed mercantile cruiser. She was attached to Cradock's squadron at the Battle of Coronel. She was sunk following a collision with the SS Kashmir off the coast of Ireland, while carrying American troops, with the loss of about 400 lives.
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The Otranto was a British-built Italian gunboat of 290 tons displacement launched in 1911 as the Mariveles, sold to Japan and renamed the Sumiye Maru and acquired by the Italian government in 1917. The Otranto had a top speed of 9.5 knots, carried a complement of 24 and was armed with two 3-inch anti-aircraft guns.
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The Otso was a Finnish icebreaker of 800 tons displacement launched in 1936. The Otso was powered by oil-fired boilers providing a top speed of 13 knots.
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The Ottawa (formerly HMS Crusader) was a Canadian Ottawa Class destroyer of 1375 tons displacement launched in 1931 and transferred to the Royal Canadian Navy in 1937 from the Royal Navy. The Ottawa was powered by three Admiralty 3-drum type boilers providing a top speed of 36 knots. She carried a complement of 145 and was armed with four 4.7-inch guns; seven smaller guns and eight 21-inch torpedo tubes arranged in two quadruples.
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The USS Otter was an American Buckley Class escort destroyer of 1400 tons displacement launched in 1943. The USS Otter had a top speed of 26 knots and carried a complement of 220. She was armed with three 3 inch guns; two 40 mm anti-aircraft guns; six 20 mm anti-aircraft guns; depth charge throwers and three 21 inch torpedo tubes in a triple mount.
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HMS Otter is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1961. HMS Otter is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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The USS Otterstetter was an American Edsall Class escort destroyer of 1200 tons displacement launched in 1943. The USS Otterstetter was powered by Fairbanks-Morse diesel engines providing a top speed of 19 knots and carried a complement of 220. She was armed with three 3 inch dual-purpose guns; two 40 mm anti-aircraft guns; four 20 mm anti-aircraft guns; depth charge throwers and three 21 inch torpedo tubes in a triple mount.
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HMS Otus was a British Olympus Class submarine of 1475 tons displacement launched in 1928. She was armed with one 4-inch gun; two machine-guns; six 21-inch torpedo tubes in the bow and two 21-inch torpedo tubes in the stern. She had a top speed of 17.5 knots on the surface, 9 knots submerged and carried a complement of 50.
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HMS Otus is a British Oberon Class patrol submarine of 2410 tons displacement dived launched in 1962. HMS Otus is powered by two Admiralty Standard Range 16 VMS diesel engines providing a top speed of 17 knots dived and a range of 9000 miles at 12 knots surfaced. She carries a crew of 69 including seven officers and is armed with six 21 inch bow torpedo tubes taking the Marconi Tigerfish Mk 24 Mod 2 torpedo or mines in place of torpedoes.
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HMS Otway was a British Oberon Class submarine of 1349 tons displacement launched in 1927 for the Royal Australian Navy, and presented to the Royal Navy in 1931. She was armed with one 4-inch gun; two machine-guns; six 21-inch torpedo tubes in the bow and two 21-inch torpedo tubes in the stern. She had a top speed of 15 knots on the surface, 9 knots submerged and carried a complement of 54.
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The Otway is an Australian Ran Oberon class submarine of 2030 tons displacement surfaced. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesels of 3680 bhp and two electric motors of 6000 shp giving a top speed of 17 knots submerged. She is armed with a McDonnell Douglas Sub Harpoon ship-to-ship missile system, six 21 inch bow torpedo tubes taking the Gould Mk 48 Mod 4 dual purpose wire-guided torpedo, and carries a total of 20 ship-to-ship missiles and torpedoes. She carries a crew of eight officers and 56 other ranks.
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The USS Ouellet is an American Knox Class frigate of 3011 tons standard displacement launched in 1970. The USS Ouellet is powered by two Babcock & Wilcox boilers providing a top speed of 27 knots and a range of 6400 km at 22 knots running on one boiler. She carries a crew of 288 including 17 officers and is armed with eight McDonnell Douglas Harpoon surface-to-surface missiles; a Honeywell ASROC Mk 16 octuple anti-ship launcher; one FMC 5 inch/54 Mk 42 Mod 9 dual-purpose gun; a General Electric/General Dynamics 20 mm/76 6-barrelled Mk 15 Vulcan Phalanx gun and two pairs of 324 mm Mk 32 torpedo tubes taking the Honeywell Mk 46 and Mk 50 torpedoes. A SH-2F LAMPS I helicopter is also carried.
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The Ouessant was a French Redoutable Class submarine of 1379 tons displacement launched in 1936. She was powered by diesel engines providing a top speed of 19 knots surfaced and electric motors providing a top speed of 10 knots submerged. She carried a complement of 67 and was armed with one 3.9 inch anti-aircraft gun; two machine guns and eleven 21.7 inch torpedo tubes.
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The Ouessant is a French Agosta class patrol submarine of 1490 tons displacement launched in 1976. She is powered by two SEMT-Pielstick 16 PA4185VG diesel engines of 3600 hp and one electric motor 4600 hp and one cruising motor of 23 kW providing a top speed of 20 knots dived and a range of 13600 km snorkelling. She carries a single crew of 58 personnel, including seven officers. Armaments consist of Aerospatiale SM 39 Exocet anti-ship missiles launched from four 533 mm bow torpedo tubes; ECAN L5 Mod 3 dual purpose and ECAN F17 Mod 2 wire-guided torpedoes; or 36 mines carried in lieu of torpedoes.
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The Ouha is a French built, Kuwaiti Um Al Maradim Class missile attack craft. The attack craft are armed with two twin launchers for the Matra BAe Dynamics Sea Skua surface to surface missiles, mounted on the aft deck. The craft can be fitted with the Simbad twin missile launcher supplied by Matra BAe Dynamics, which fires the Mistral surface to air missile. The Simbad launcher is installed on the weapon deck to the stern of the radar mast. The vessel's main gun, the Otobreda 40 mm gun, is installed on the bow deck. The Giat type M621 20 mm gun is mounted at the stern and there are also two 12.7 mm general purpose machine-guns. The fast attack craft uses a steel hull construction and the full load displacement is 245 tons. The craft is operated by a crew of 24. The propulsion system is based on two MTU 2.94 MW diesel engines with two water jet systems. The patrol boat is capable of a maximum speed of 30 knots. At an economical speed of 15 knots, the range is over 1, 300 miles.
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The Ovens is an Australian Ran Oberon class submarine of 2030 tons displacement surfaced. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesels of 3680 bhp and two electric motors of 6000 shp giving a top speed of 17 knots submerged. She is armed with a McDonnell Douglas Sub Harpoon ship-to-ship missile system, six 21 inch bow torpedo tubes taking the Gould Mk 48 Mod 4 dual purpose wire-guided torpedo, and carries a total of 20 ship-to-ship missiles and torpedoes. She carries a crew of eight officers and 56 other ranks.
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The USS Overton was an American flush deck type destroyer of 1193 tons displacement launched in 1919. The USS Overton was powered by four White-Forster oil-burning boilers providing a top speed of 35 knots. She carried a complement of 122 and was armed with four 4 inch guns; one 3 inch anti-aircraft gun and twelve 21 inch torpedo tubes arranged in four triple arrangements.
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The USS Owen was an American Fletcher Class destroyer of 2050 tons displacement built under the 1940-41 programme. The USS Owen was powered by four Babcock and Wilcox boilers providing a top speed of 36 knots. She carried a complement of 353 and was armed with five 5 inch guns; six 40 mm Bofors anti-aircraft guns; ten 20 mm Oerlikon anti-aircraft guns and ten 21 inch torpedo tubes arranged in two quintuplets.
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The USS Oxbourn was an American Gearing Class destroyer of 2400 tons displacement launched in 1946. The USS Oxbourn was powered by four boilers providing a top speed of 35 knots. She carried a complement of 350 and was armed with six 5 inch guns; twelve 40 mm anti-aircraft guns; eleven 20 mm anti-aircraft guns and ten 21 inch torpedo tubes arranged in two quintuplets.
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HMS Oxford Castle was a British Castle Class frigate of 1100 tons displacement launched in 1943. She carried a crew of 96, and had a top speed of 16.5 knots. Armaments consisted of one 4 inch calibre Mk XIX gun; two 40 mm anti-aircraft guns in a twin arrangement; two 20 mm guns in a twin arrangement; one squid three-barrelled anti-ship mortar; two depth charge launchers and fifteen depth charges.
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The Oxley is an Australian Ran Oberon class submarine of 2030 tons displacement surfaced. She is powered by two Admiralty Standard Range 16 VVS-ASR1 diesels of 3680 bhp and two electric motors of 6000 shp giving a top speed of 17 knots submerged. She is armed with a McDonnell Douglas Sub Harpoon ship-to-ship missile system, six 21 inch bow torpedo tubes taking the Gould Mk 48 Mod 4 dual purpose wire-guided torpedo, and carries a total of 20 ship-to-ship missiles and torpedoes. She carries a crew of eight officers and 56 other ranks.
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The Oyapock was a British-built Brazilian river gunboat of 195 tons displacement launched in 1907. The Oyapock had a top speed of 14 knots and carried a complement of 51. She was armed with two 3-pdr guns and two machine-guns.
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The Oyasio was a Japanese Kagero Class destroyer of 2000 tons displacement launched in 1938. The Oyasio was powered by three Kanpon boilers providing a top speed of 36 knots. She was armed with six 5 inch guns; two machine-guns and eight 21 inch torpedo tubes.
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The Ozelot is a German Gepard Class missile fast attack craft of 391 tons displacement. Four MTU MA16V 956 SB80 diesel engines rated at 18000 hp provide a top speed of 40 knots and a range of 4160 km at 16 knots. She carries a complement of 34 including four officers. As well as having mine laying capabilities, she is armed with four Aerospatiale Exocet MM38 anti-ship missiles; a GDC RAM 21 cell point anti-air defence system; one OTO Melara 76 mm/62 compact dual-purpose gun.
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