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49-465: IL4 , Il-4 , or IL-4 may refer to: Ilyushin Il-4 , a Soviet World War II bomber Interleukin 4 , a cytokine that stimulates the proliferation of activated B-cells Illinois's 4th congressional district Illinois Route 4 [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as

98-640: A Jurchen Jin army against a Chinese Song city. The term for this explosive bomb seems to have been coined the " thunder crash bomb " during a Jin dynasty (1115–1234) naval battle in 1231 against the Mongols . The History of Jin (金史) (compiled by 1345) states that in 1232, as the Mongol general Subutai (1176–1248) descended on the Jin stronghold of Kaifeng , the defenders had a " thunder crash bomb " which "consisted of gunpowder put into an iron container ... then when

147-404: A blasting cap containing a more sensitive primary explosive . A thermobaric bomb is a type of explosive that utilizes oxygen from the surrounding air to generate an intense, high-temperature explosion, and in practice the blast wave typically produced by such a weapon is of a significantly longer duration than that produced by a conventional condensed explosive. The fuel-air bomb is one of

196-593: A bomb exploding in a transport network often damages, and is sometimes mainly intended to damage, the network itself. This applies to railways , bridges , runways , and ports , and, to a lesser extent (depending on circumstances), to roads. In the case of suicide bombing , the bomb is often carried by the attacker on their body, or in a vehicle driven to the target. The Blue Peacock nuclear mines, which were also termed "bombs", were planned to be positioned during wartime and be constructed such that, if disturbed, they would explode within ten seconds. The explosion of

245-477: A bomb may be triggered by a detonator or a fuse . Detonators are triggered by clocks , remote controls like cell phones or some kind of sensor, such as pressure (altitude), radar , vibration or contact. Detonators vary in ways they work, they can be electrical, fire fuze or blast initiated detonators and others, In forensic science , the point of detonation of a bomb is referred to as its blast seat, seat of explosion, blast hole or epicenter . Depending on

294-493: A combination of negative shock wave effects and extreme temperature to incinerate objects within the blast radius. Fragmentation is produced by the acceleration of shattered pieces of bomb casing and adjacent physical objects. The use of fragmentation in bombs dates to the 14th century, and appears in the Ming Dynasty text Huolongjing . The fragmentation bombs were filled with iron pellets and pieces of broken porcelain. Once

343-407: A comparatively low explosive yield to scatter harmful material over a wide area. Most commonly associated with radiological or chemical materials, dirty bombs seek to kill or injure and then to deny access to a contaminated area until a thorough clean-up can be accomplished. In the case of urban settings, this clean-up may take extensive time, rendering the contaminated zone virtually uninhabitable in

392-412: A high burst pressure to be useful as a bomb. A high explosive bomb is one that employs a process called " detonation " to rapidly go from an initially high energy molecule to a very low energy molecule. Detonation is distinct from deflagration in that the chemical reaction propagates faster than the speed of sound (often many times faster) in an intense shock wave. Therefore, the pressure wave produced by

441-444: A high explosive is not significantly increased by confinement as detonation occurs so quickly that the resulting plasma does not expand much before all the explosive material has reacted. This has led to the development of plastic explosive . A casing is still employed in some high explosive bombs, but with the purpose of fragmentation . Most high explosive bombs consist of an insensitive secondary explosive that must be detonated with

490-535: A letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=IL-4&oldid=558068968 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Ilyushin Il-4 In 1938,

539-574: A major military feature, and a number of novel delivery methods were introduced. These included Barnes Wallis 's bouncing bomb , designed to bounce across water, avoiding torpedo nets and other underwater defenses, until it reached a dam , ship , or other destination, where it would sink and explode. By the end of the war, planes such as the allied forces' Avro Lancaster were delivering with 50 yd (46 m) accuracy from 20,000 ft (6,100 m), ten ton earthquake bombs (also invented by Barnes Wallis) named " Grand Slam ", which, unusually for

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588-401: A mixture of an oxidizing salt, such as potassium nitrate (saltpeter), with solid fuel, such as charcoal or aluminium powder. These compositions deflagrate upon ignition, producing hot gas. Under normal circumstances, this deflagration occurs too slowly to produce a significant pressure wave; low explosives, therefore, must generally be used in large quantities or confined in a container with

637-516: A range of offensive weaponry. For instance, in recent asymmetric conflicts, homemade bombs called " improvised explosive devices " (IEDs) have been employed by irregular forces to great effectiveness. The word comes from the Latin bombus , which in turn comes from the Greek βόμβος romanized bombos , an onomatopoetic term meaning 'booming', 'buzzing'. Gunpowder bombs had been mentioned since

686-407: A significant explosion can occur. Under the right circumstances, rapid consolidation can provoke a chain reaction that can proliferate and intensify by many orders of magnitude within microseconds. The energy released by a nuclear fission bomb may be tens of thousands of times greater than a chemical bomb of the same mass. A thermonuclear weapon is a type of nuclear bomb that releases energy through

735-619: A single pylon. Some bombs are equipped with a parachute , such as the World War II "parafrag" (an 11 kg (24 lb) fragmentation bomb), the Vietnam War -era daisy cutters , and the bomblets of some modern cluster bombs . Parachutes slow the bomb's descent, giving the dropping aircraft time to get to a safe distance from the explosion. This is especially important with air-burst nuclear weapons (especially those dropped from slower aircraft or with very high yields), and in situations where

784-562: A standard design out of standard components and intended to be deployed in a standard explosive device. IEDs are divided into three basic categories by basic size and delivery. Type 76, IEDs are hand-carried parcel or suitcase bombs, type 80, are "suicide vests" worn by a bomber, and type 3 devices are vehicles laden with explosives to act as large-scale stationary or self-propelled bombs, also known as VBIED (vehicle-borne IEDs). Improvised explosive materials are typically unstable and subject to spontaneous, unintentional detonation triggered by

833-469: A wide range of environmental effects, ranging from impact and friction to electrostatic shock. Even subtle motion , change in temperature , or the nearby use of cellphones or radios can trigger an unstable or remote-controlled device. Any interaction with explosive materials or devices by unqualified personnel should be considered a grave and immediate risk of death or dire injury. The safest response to finding an object believed to be an explosive device

882-454: Is a hypothetical nuclear weapon that does not require a primary fission stage to start a fusion reaction. Antimatter bombs can theoretically be constructed, but antimatter is very costly to produce and hard to store safely. The first air-dropped bombs were used by the Austrians in the 1849 siege of Venice . Two hundred unmanned balloons carried small bombs, although few bombs actually hit

931-437: Is created by the sudden release of heat caused by an explosion. Military bomb tests have documented temperatures of up to 2,480 °C (4,500 °F). While capable of inflicting severe to catastrophic burns and causing secondary fires, thermal wave effects are considered very limited in range compared to shock and fragmentation. This rule has been challenged, however, by military development of thermobaric weapons , which employ

980-565: Is not usually applied to explosive devices used for civilian purposes such as construction or mining , although the people using the devices may sometimes refer to them as a "bomb". The military use of the term "bomb", or more specifically aerial bomb action, typically refers to airdropped, unpowered explosive weapons most commonly used by air forces and naval aviation . Other military explosive weapons not classified as "bombs" include shells , depth charges (used in water), or land mines . In unconventional warfare , other names can refer to

1029-415: Is to get as far away from it as possible. Atomic bombs are based on the theory of nuclear fission , that when a large atom splits, it releases a massive amount of energy. Thermonuclear weapons , (colloquially known as "hydrogen bombs") use the energy from an initial fission explosion to create an even more powerful fusion explosion. The term " dirty bomb " refers to a specialized device that relies on

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1078-531: The United States Air Force 's MOAB (officially Massive Ordnance Air Blast, or more commonly known as the "Mother of All Bombs"). Below is a list of five different types of bombs based on the fundamental explosive mechanism they employ. Relatively small explosions can be produced by pressurizing a container until catastrophic failure such as with a dry ice bomb . Technically, devices that create explosions of this type can not be classified as "bombs" by

1127-473: The exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy . Detonations inflict damage principally through ground- and atmosphere-transmitted mechanical stress , the impact and penetration of pressure-driven projectiles, pressure damage, and explosion-generated effects. Bombs have been utilized since the 11th century starting in East Asia . The term bomb

1176-450: The turret , using the 12.7 mm (0.5 in) UBT machine gun in place of the earlier 7.62 mm (0.3 in) weapons. In addition, it was found that the gunners were attacked first, so blocks of armor were placed around the gunner positions. This extra weight was not offset by the newer engines however, and the Il-4 proved to be slower than the earlier versions at only 404 km/h (251 mph). An attempt to improve performance

1225-569: The "thunder-crash bombs" has been discovered in an underwater shipwreck off the shore of Japan by the Kyushu Okinawa Society for Underwater Archaeology. X-rays by Japanese scientists of the excavated shells confirmed that they contained gunpowder. Explosive shock waves can cause situations such as body displacement (i.e., people being thrown through the air), dismemberment , internal bleeding and ruptured eardrums . Shock waves produced by explosive events have two distinct components,

1274-501: The 1,100 hp (820 kW) Tumansky M-88 quickly replacing the M-87. The DB-3F was redesignated Il-4 in March 1942. Some series had wooden outer wings and front fuselages to conserve metals , and throughout the production, engines and fuel tanks were upgraded for improved performance while retaining the same range. However the most notable change was the addition of larger defensive guns in

1323-803: The 11th century. In 1000 AD, a soldier by the name of Tang Fu (唐福) demonstrated a design of gunpowder pots (a proto-bomb which spews fire) and gunpowder caltrops, for which he was richly rewarded. In the same year, Xu Dong wrote that trebuchets used bombs that were like "flying fire", suggesting that they were incendiaries. In the military text Wujing Zongyao of 1044, bombs such as the "ten-thousand fire flying sand magic bomb", "burning heaven fierce fire unstoppable bomb", and "thunderclap bomb" ( pilipao ) were mentioned. However these were soft-shell bombs and did not use metal casings. Bombs made of cast iron shells packed with explosive gunpowder date to 13th century China. Explosive bombs were used in East Asia in 1221, by

1372-517: The Il-4 was used on several long-range bombing raids against Berlin in 1941. Most would be used on much shorter range missions, often adding another 1,000 kg (2,204 lb) of bombs under the wings, in addition to the internal 2,500 kg (5,512 lb) . Finland bought four captured DB-3Fs from German stocks. These were given the Finnish Air Force serials DF-22 to DF-25 and flown from Bryansk , Russia to Finland (one aircraft, DF-22,

1421-551: The Ilyushin design bureau redesigned the Ilyushin DB-3 to ease production and improve its performance, the revised version receiving the designation DB-3F ( Forsirovanniye or "boosted"). The aircraft's internal structure, particularly the wings, was extensively changed, eliminating the need for hand finishing of the structure, and with duralumin replacing the large scale use of steel in the earlier version. The aircraft's fuel system

1470-491: The aircraft releases a bomb at low altitude. A number of modern bombs are also precision-guided munitions , and may be guided after they leave an aircraft by remote control, or by autonomous guidance. Aircraft may also deliver bombs in the form of warheads on guided missiles , such as long-range cruise missiles , which can also be launched from warships . A hand grenade is delivered by being thrown. Grenades can also be projected by other means, such as being launched from

1519-401: The best-known types of thermobaric weapons. Nuclear fission type atomic bombs utilize the energy present in very heavy atomic nuclei, such as U-235 or Pu-239. In order to release this energy rapidly, a certain amount of the fissile material must be very rapidly consolidated while being exposed to a neutron source. If consolidation occurs slowly, repulsive forces drive the material apart before

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1568-515: The bomb explodes, the resulting fragments are capable of piercing the skin and blinding enemy soldiers. While conventionally viewed as small metal shards moving at super- supersonic and hypersonic speeds, fragmentation can occur in epic proportions and travel for extensive distances. When the SS Grandcamp exploded in the Texas City Disaster on April 16, 1947, one fragment of that blast

1617-846: The city. The first bombing from a fixed-wing aircraft took place in 1911 when the Italians dropped bombs by hand on the Turkish lines in what is now Libya , during the Italo-Turkish War . The first large scale dropping of bombs took place during World War I starting in 1915 with the German Zeppelin airship raids on London , England, and the same war saw the invention of the first heavy bombers . One Zeppelin raid on 8 September 1915 dropped 4,000 lb (1,800 kg) of high explosives and incendiary bombs, including one bomb that weighed 600 lb (270 kg). During World War II bombing became

1666-608: The combination of fission and fusion of the light atomic nuclei of deuterium and tritium. With this type of bomb, a thermonuclear detonation is triggered by the detonation of a fission type nuclear bomb contained within a material containing high concentrations of deuterium and tritium. Weapon yield is typically increased with a tamper that increases the duration and intensity of the reaction through inertial confinement and neutron reflection. Nuclear fusion bombs can have arbitrarily high yields making them hundreds or thousands of times more powerful than nuclear fission. A pure fusion weapon

1715-433: The definition presented at the top of this article. However, the explosions created by these devices can cause property damage, injury, or death. Flammable liquids, gasses and gas mixtures dispersed in these explosions may also ignite if exposed to a spark or flame. The simplest and oldest bombs store energy in the form of a low explosive . Black powder is an example of a low explosive. Low explosives typically consist of

1764-448: The explosive fireball as well as incendiary agents projected onto the body. Personal protective equipment, such as a bomb suit or demining ensemble, as well as helmets, visors and foot protection, can dramatically reduce the four effects, depending upon the charge, proximity and other variables. Experts commonly distinguish between civilian and military bombs. The latter are almost always mass-produced weapons, developed and constructed to

1813-463: The fuse was lit (and the projectile shot off) there was a great explosion the noise whereof was like thunder, audible for more than thirty miles, and the vegetation was scorched and blasted by the heat over an area of more than half a mou . When hit, even iron armour was quite pierced through." The Song Dynasty (960–1279) official Li Zengbo wrote in 1257 that arsenals should have several hundred thousand iron bomb shells available and that when he

1862-559: The interim. The power of large bombs is typically measured in kilotons (kt) or megatons of TNT (Mt) . The most powerful bombs ever used in combat were the two atomic bombs dropped by the United States to attack Hiroshima and Nagasaki , and the most powerful ever tested was the Tsar Bomba . The most powerful non-nuclear bomb is Russian " Father of All Bombs " (officially Aviation Thermobaric Bomb of Increased Power (ATBIP)) followed by

1911-427: The internal organs. When the overpressure wave impacts the body it can induce violent levels of blast-induced acceleration. Resulting injuries may range from minor to unsurvivable. Immediately following this initial acceleration, deceleration injuries can occur when a person impacts directly against a rigid surface or obstacle after being set in motion by the force of the blast. Finally, injury and fatality can result from

1960-458: The muzzle of a rifle (as in the rifle grenade ), using a grenade launcher (such as the M203 ), or by attaching a rocket to the explosive grenade (as in a rocket-propelled grenade (RPG)). A bomb may also be positioned in advance and concealed. A bomb destroying a rail track just before a train arrives will usually cause the train to derail . In addition to the damage to vehicles and people,

2009-477: The positive and negative wave. The positive wave shoves outward from the point of detonation, followed by the trailing vacuum space "sucking back" towards the point of origin as the shock bubble collapses. The greatest defense against shock injuries is distance from the source of shock. As a point of reference, the overpressure at the Oklahoma City bombing was estimated in the range of 28 MPa . A thermal wave

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2058-420: The sudden and drastic rise in ambient pressure that can damage the internal organs, possibly leading to permanent damage or death. Fragmentation can also include sand, debris and vegetation from the area surrounding the blast source. This is very common in anti-personnel mine blasts. The projection of materials poses a potentially lethal threat caused by cuts in soft tissues, as well as infections, and injuries to

2107-515: The time, were delivered from high altitude in order to gain high speed, and would, upon impact, penetrate and explode deep underground (" camouflet "), causing massive caverns or craters, and affecting targets too large or difficult to be affected by other types of bomb. Modern military bomber aircraft are designed around a large-capacity internal bomb bay , while fighter-bombers usually carry bombs externally on pylons or bomb racks or on multiple ejection racks, which enable mounting several bombs on

2156-399: The woods in Öja near the city of Kokkola . Most parts of the plane were rescued and taken to a depot. Data from From DB-3 To Il-4...The Soviet Long-Range Bomber General characteristics Performance Armament Related development Aircraft of comparable role, configuration, and era Related lists Bomb A bomb is an explosive weapon that uses

2205-494: Was a two-ton anchor which was hurled nearly two miles inland to embed itself in the parking lot of the Pan American refinery. To people who are close to a blast incident, such as bomb disposal technicians, soldiers wearing body armor, deminers, or individuals wearing little to no protection, there are four types of blast effects on the human body: overpressure (shock), fragmentation , impact , and heat . Overpressure refers to

2254-410: Was destroyed en route and crashed near Syeschtschinskaya airfield). The aircraft were later flown by No. 48 Sqn during 1943 (DF-23, DF-24 and DF-25), No. 46 Sqn during 1944 (DF-23 and DF-24) and No. 45 Sqn for a short time in 1945 (DF-23), until the last remaining serviceable aircraft went into depot on 23 February 1945. After the war, DF-25 was lost in a snowstorm, landed on the ice and crashed into

2303-614: Was in Jingzhou , about one to two thousand were produced each month for dispatch of ten to twenty thousand at a time to Xiangyang and Yingzhou. The Ming Dynasty text Huolongjing describes the use of poisonous gunpowder bombs, including the "wind-and-dust" bomb. During the Mongol invasions of Japan , the Mongols used the explosive "thunder-crash bombs" against the Japanese. Archaeological evidence of

2352-495: Was made as the Il-6 , adding large diesel engines and heavier armament. The engines proved unreliable and production was never started. The Il-4 remained in production until 1945, when just over 5,200 had been built. Although the Il-4 was only a medium bomber, it had the range to be used on strategic missions. The use of the bombers in this role was not a priority for the VVS , but nevertheless

2401-568: Was redesigned, increasing its internal capacity while reducing the number of fuel tanks. The fuselage nose was lengthened to give more room for the navigator/bombardier while reducing drag. The prototype DB-3F, powered by the same 949 hp (708 kW) Tumansky M-87 B engines of the DB-3M, was piloted on its maiden flight by Vladimir Kokkinaki on 21 May 1939. It successfully passed through state acceptance tests and entered production in January 1940, with

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