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Squeeze Bore
A squeeze bore, alternatively taper-bore, cone barrel or conical barrel, is a weapon where the internal gun barrel, barrel diameter progressively decreases towards the muzzle (firearms), muzzle, resulting in a reduced final internal diameter. These weapons are used in conjunction with special sub-caliber ammunition where the projectile is fitted with soft-metal flanges which fills out the caliber. As the projectile travels through the squeeze bore, the flanges fold inwards, resulting in a reduced caliber round with an increased velocity compared to a traditional full-caliber round. Mechanism A squeeze bore utilizes the energy of the propellant to squeeze the diameter of the bullet or shell (projectile), shell down, increasing penetration and velocity significantly. This process also means high chamber pressure and low barrel service life. For example, the service life of a squeeze bore 7.5 cm Pak 41 could be as low as 1000 rounds compared to 5000–7000 rounds for the 7.5 cm Pak 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armor-piercing Composite Non-rigid
Armour-piercing ammunition (AP) is a type of projectile designed to penetrate armour protection, most often including naval armour, body armour, and vehicle armour. The first, major application of armour-piercing projectiles was to defeat the thick armour carried on many warships and cause damage to their lightly armoured interiors. From the 1920s onwards, armour-piercing weapons were required for anti-tank warfare. AP rounds smaller than 20 mm are intended for lightly armoured targets such as body armour, bulletproof glass, and lightly armoured vehicles. As tank armour improved during World War II, anti-vehicle rounds began to use a smaller but dense penetrating body within a larger shell, firing at a very-high muzzle velocity. Modern penetrators are long rods of dense material like tungsten or depleted uranium (DU) that further improve the terminal ballistics. Penetration In the context of weaponry, ''penetration'' is the ability of a weapon or projectile to pierce i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerlich Squeeze Bore Patent
Gerlich is a surname. Notable people with the surname include: * Daniel Gerlich (born 1972), German cell biologist * Fritz Gerlich (1883–1934), German journalist and historian * Jakob "Jackie" Gerlich (1917–1960), American dwarf actor and circus entertainer * Krista Gerlich, American basketball coach {{surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Choke (firearms)
A choke is a tapered constriction of a firearm gun barrel, barrel at its muzzle (firearm), muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns. Notably, some .22 LR match rifles have a constricted bore diameter near the muzzle. Chokes are almost always used with modern hunting and target shotguns to improve performance. Their purpose is to shape the spread of the shot "cloud" or "string" to gain better range and accuracy, and to deliver the optimum pattern of pellet density, for the particular target, depending on its size, range, aspect and whether it is traveling towards, across or away from the shooter. Chokes are implemented as either screw-in chokes, selected for particular applications, or as fixed, permanent chokes, integral to the shotgun barrel. Chokes may be formed at the time of manufacture either as part of the barrel, by squeezing the end of the bore down over a mandrel, or by threading the barrel and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrarch Tank
The light tank Mk VII (A17), also known as the Tetrarch, was a British light tank produced by Vickers-Armstrongs in the late 1930s and used during the Second World War. The Tetrarch was the latest in the line of light tanks of the United Kingdom, light tanks built by the company for the British Army. It improved upon its predecessor, the Light Tank Mk VI#Tank, Light, Mk VIC, Light Tank Mk VIC, by introducing the extra firepower of a Ordnance QF 2-pounder, 2-pounder gun. The War Office ordered 70 tanks, an order that eventually increased to 220. Production was delayed by several factors and only 100 to 177 of the tanks were produced. The design flaws of the tank, combined with the decision by the War Office not to use light tanks in British armoured divisions, ruled out the use of Tetrarchs in the North African Campaign. The majority of the tanks remained in Britain, although twenty were sent to the USSR as part of Lend-Lease. In early 1941, the Royal Armoured Corps formed three ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
10 Cm Schwere Kanone 18
The 10 cm schwere Kanone 18 (10 cm sK 18) was a field gun used by Germany in World War II. The German army wanted a new 10.5 cm gun as well as 15 cm howitzer which were to share the same carriage. Guns are heavier than howitzers due to the longer barrel. This also led to the 15 cm sFH 18. As such both weapons had a similar weight and could be carried by a similar carriage. By 1926 Krupp and Rheinmetall had specimen designs, and prototypes were ready by 1930, but was not fielded until 1933–34. Both Krupp and Rheinmetall competed for the development contract, but the Wehrmacht compromised and selected Krupp's carriage to be mated with Rheinmetall's gun. It sometimes equipped the medium artillery battalion (with the 15 cm sFH 18) of German divisions, but generally was used by independent artillery battalions and on coast defense duties. Some were used as anti-tank guns during the early stages of war on the Eastern Front, as well as on the proto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
František Janeček
František Janeček (1878–1941) was the founder of Jawa motorcycles and an important figure in the development of the Czechoslovakian motorcycle industry. He died on 4 June 1941. Early life Janeček was born on 23 January 1878 in Klášter nad Dědinou, a small village in Bohemia in the present-day Czech Republic. He went to Prague to study mechanics at the Prague Technical School and then moved to Germany to the Berlin College of Engineering. Upon graduation he returned to Prague and began working for the Jewish industrialist Emil Kolben at the Kolben company. He did well and when he was only 23 he was appointed manager of the new factory opened by Kolben in the Netherlands, where he met his future wife. He was hit by a car when riding his bicycle to work. The daughter of the driver gave him first aid, and they became friends and later married. At the age of 31 years, motivated by his success at designing inventions, Janeček decided to quit Kolben and start his own engineer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance QF 2-pounder
The Ordnance QF 2-pounder (British ordnance terms#QF, QF denoting "quick firing"), or simply "2 pounder gun", was a British anti-tank gun and vehicle-mounted gun employed in the World War II, Second World War. It was the main anti-tank weapon of the artillery units in the Battle of France and, due to the need to rearm quickly after the Dunkirk evacuation, remained in service during the North African campaign. In its vehicle-mounted variant the 2-pounder was a common main gun on British tanks early in World War II, as well as being a typical main armament of Armored car (military), armoured cars, such as the Daimler armoured car, Daimler, throughout the war. As the armour protection of Axis powers, Axis tanks improved, the 2-pounder lost effectiveness and it was gradually replaced by the 57 mm Ordnance QF 6 pounder, QF 6-pounder starting in 1942. It equipped infantry battalion anti-tank platoons replacing their anti-tank rifles until in turn replaced by 6-pounders but remained ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M2 Browning
The M2 machine gun or Browning .50-caliber machine gun (informally, "Ma Deuce") is a heavy machine gun that was designed near the end of World War I by John Browning. While similar to Browning's M1919 Browning machine gun, which was chambered for the .30-06 Springfield, .30-06 cartridge, the M2 uses Browning's larger and more powerful .50 BMG (12.7 mm) cartridge. The design has had many designations; the official U.S. military designation for the infantry type is Browning Machine Gun, Cal. .50, M2, HB, Flexible. It has been used against infantry, light armored vehicles, watercraft, light fortifications, and low-flying aircraft. The gun has been used extensively as a vehicle weapon and for aircraft armament by the United States since the 1930s. It was heavily used during World War II, the Korean War, the Vietnam War, the Falklands War, the Soviet–Afghan War, the Gulf War, the Iraq War, and the War in Afghanistan (2001–present), War in Afghanistan. It is the primary heavy mac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance QF 6-pounder
The Ordnance quick-firing 6-pounder 7 cwt,British forces traditionally denoted smaller ordnance by the weight of its standard projectile, in this case approximately . The approximate weight of the gun barrel and breech, "7 cwt" (cwt = hundredweight), was included in the designation to distinguish this gun from others also firing a 6 lb projectile. or just 6-pounder, was a British 57 mm gun, serving during the Second World War as a primary anti-tank gun of both the British and United States Army (as the 57 mm gun M1). It was also used as the main armament for a number of armoured fighting vehicles. Although designed before the start of the war, it did not reach service until the North African Campaign in April 1942, where it replaced the 2-pounder as an anti-tank gun, allowing the 25-pounder gun-howitzer to revert to its intended artillery role. Development and production Development Limitations of the existing 2-pounders were apparent even as the gun entered se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Littlejohn Adaptor
The Littlejohn adaptor was a device that could be added to the British QF 2 pounder (40 mm) anti-tank gun. It was used to extend the service life of the 2-pounder during the Second World War by converting it to squeeze bore operation. "Littlejohn" came from the calque In linguistics, a calque () or loan translation is a word or phrase borrowed from another language by literal word-for-word or root-for-root translation. When used as a verb, "to calque" means to borrow a word or phrase from another language ..., i.e. literal anglicization, of the name of František Janeček, the Czech designer and factory owner who had been working on the squeeze-bore principle in the 1930s, and his son František Karel Janeček, who had brought his know-how to Britain after fleeing from German-occupied Czechoslovakia. Design The adaptor took the form of a reducing bore that was screwed on to the end of the gun. This was coupled with a round formed from a hard core ( tungsten) insi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Krupp
Friedrich Krupp AG Hoesch-Krupp (formerly Fried. Krupp AG and Friedrich Krupp GmbH), trade name, trading as Krupp, was the largest company in Europe at the beginning of the 20th century as well as Germany's premier weapons manufacturer during both world war, world wars. It produced battleship, battleships, U-boats, tanks, howitzers, guns, utilities, and hundreds of other commodities. The company also produced steel used to build railroads in the United States and to cap the Chrysler Building. After the Nazi Germany, Nazis seized power in Germany, Krupp supported the regime and was one of many German businesses that profited from forced labour under German rule during World War II, slave labor during World War II. Upon the war's end, the head of the company, Alfried Krupp, was tried and convicted as a war criminal for employing prisoners of war, foreign civilians and concentration camp inmates under inhumane conditions in support of the Nazi war effort. Despite being senten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mauser
Mauser, originally the Königlich Württembergische Gewehrfabrik, was a German arms manufacturer. Their line of bolt-action rifles and semi-automatic pistols was produced beginning in the 1870s for the German armed forces. In the late 19th and early 20th centuries, Mauser designs were also exported and licensed to many countries, which adopted them as military and civilian sporting firearms. The Gewehr 98 in particular was widely adopted and copied, becoming one of the most copied firearms designs and it is the foundation of many of today's sporting bolt-action rifles. Around 10 million Gewehr 98 style rifles were produced. History King Frederick I of Württemberg founded the enterprise as Königliche Waffen Schmieden (literally: Royal Weapons Forges) on 31 July 1811. Originally located partly at Ludwigsburg and partly at Christophsthal, the factory was transferred to the former Augustine Cloister in Oberndorf am Neckar, where Andreas Mauser worked as the master gunsmith. Of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
