High-test peroxideHigh-test peroxide (HTP) is a highly concentrated (85 to 98%) solution of hydrogen peroxide, with the remainder consisting predominantly of water. In contact with a catalyst, it decomposes into a high-temperature mixture of steam and oxygen, with no remaining liquid water. It was used as a propellant of HTP rockets and torpedoes, and has been used for high-performance vernier engines. Hydrogen peroxide works best as a propellant in extremely high concentrations (roughly over 70%).
Anti-surface warfareAnti-surface warfare (ASuW or ASUW) is the branch of naval warfare concerned with the suppression of surface combatants. More generally, it is any weapons, sensors, or operations intended to attack or limit the effectiveness of an adversary's surface ships. Before the adoption of the submarine and naval aviation, all naval warfare consisted of anti-surface warfare. The distinct concept of an anti-surface warfare capability emerged after World War II, and literature on the subject as a distinct discipline is inherently dominated by the dynamics of the Cold War.
Mark 15 torpedoThe Mark 15 torpedo was the standard American destroyer-launched torpedo of World War II. It was very similar in design to the Mark 14 torpedo except that it was longer, heavier, and had greater range and a larger warhead. The Mark 15 was developed by the Naval Torpedo Station Newport concurrently with the Mark 14 and was first deployed in 1938. It served as a replacement for the Mark 8 torpedo, Mark 11 Torpedo and Mark 12 Torpedo on surface ships with tubes that could accommodate the longer Mark 15; this primarily included destroyers built after 1930.
Anti-torpedo bulgeThe anti-torpedo bulge (also known as an anti-torpedo blister) is a form of defence against naval torpedoes occasionally employed in warship construction in the period between the First and Second World Wars. It involved fitting (or retrofitting) partially water-filled compartmentalized sponsons on either side of a ship's hull, intended to detonate torpedoes, absorb their explosions, and contain flooding to damaged areas within the bulges. Essentially, the bulge is a compartmentalized, below the waterline sponson isolated from the ship's internal volume.
Missile boatA missile boat or missile cutter is a small, fast warship armed with anti-ship missiles. Being smaller than other warships such as destroyers and frigates, missile boats are popular with nations interested in forming a navy at lower cost. They are similar in concept to the torpedo boats of World War II; in fact, the first missile boats were modified torpedo boats with the torpedo tubes replaced by missile tubes. The doctrine behind the use of missile boats is based on the principle of mobility over defence and firepower.
Battle of the Barents SeaThe Battle of the Barents Sea was a World War II naval engagement on 31 December 1942 between warships of the German Navy (Kriegsmarine) and British ships escorting convoy JW 51B to Kola Inlet in the USSR. The action took place in the Barents Sea north of North Cape, Norway. The German raiders' failure to inflict significant losses on the convoy infuriated Hitler, who ordered that German naval strategy would henceforth concentrate on the U-boat fleet rather than surface ships.
Mark 10 torpedoThe Mark 10 torpedo was a torpedo put into use by the United States in 1915. It was derived from the Mark 9 aircraft torpedo converted to submarine use. It was used as the primary torpedo in the R- and S-class submarines. (Seven of the R-class, R-21 through R-27, were equipped with 18-inch torpedo tubes, but were decommissioned in 1924 and 1925.) It used alcohol-water steam turbine propulsion. It was succeeded by the problematic Mark 14 torpedo, but remained in service in S-boats and fleet submarines through the Pacific War.
Battle of Port ArthurThe Battle of Port Arthur of 8–9 February 1904 marked the commencement of the Russo-Japanese War. It began with a surprise night attack by a squadron of Japanese destroyers on the neutral Russian fleet anchored at Port Arthur, Manchuria, and continued with an engagement the following morning; further skirmishing off Port Arthur would continue until May 1904. The attack ended inconclusively, though the war resulted in a decisive Japanese victory.
Type 209 submarineThe Type 209 (U-Boot-Klasse 209) is a range of diesel-electric attack submarines developed exclusively for export by Howaldtswerke-Deutsche Werft of Germany. Five class variants (Types 209/1100, 209/1200, 209/1300, 209/1400 and 209/1500), including modifications thereof, have been successfully exported to 15 countries, with 68 submarines being built and commissioned to five different variants between 1971 and 2021. More boats have been built to modified designs.
