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60-448: The SMAW-D operates on the principle that the recoil created by launching the rocket is counteracted by a "backblast" of gases fired from the rear of the weapon. This makes the SMAW-D inherently dangerous, especially in confined, urban areas, as is the case with all weapons of this design. The M141 has two configurations: a carry mode in which the launcher is 810 mm (32 in) long, and

120-508: A tandem charge ) to be more effective against reactive or multi-layered armor. The first, smaller warhead initiates the reactive armor, while the second (or other), larger warhead penetrates the armor below. This approach requires highly sophisticated fuzing electronics to set off the two warheads the correct time apart, and also special barriers between the warheads to stop unwanted interactions; this makes them cost more to produce. The latest HEAT warheads, such as 3BK-31, feature triple charges:

180-675: A German ballistics expert, engineer and academic who studied in the field of high-speed photography and cinematography . He also was the director of the German-French Research Institute (ISL) in Saint-Louis (France) and founder and director of the Fraunhofer Society Institute for High-Speed Dynamics - Ernst-Mach-Institut (EMI) - in Freiburg im Breisgau. The main importance of Schardin's scientific activities

240-471: A HEAT round achieves its effectiveness through three primary mechanisms. Most obviously, when it perforates the armor, the jet's residual can cause great damage to any interior components it strikes. And as the jet interacts with the armor, even if it does not perforate into the interior, it typically causes a cloud of irregular fragments of armor material to spall from the inside surface. This cloud of behind-armor debris too will typically damage anything that

300-488: A general scientific level of instrumentation. He also developed new application areas for these techniques. An important innovation by Schardin was the development of a High speed camera in 1929 with his PhD advisor Carl Cranz , the ( Cranz-Schardin camera ). This high-speed camera was important in scientific research for almost a century, and was only recently rendered obsolete by modern advances in high-speed electronic digital cameras. Schardin also had significant impact on

360-504: A handheld weapon, thereby dramatically altering the nature of mobile operations. During World War II, weapons using HEAT warheads were termed hollow charge or shape charge warheads. The general public remained in the dark about shape charge warheads, even believing that it was a new secret explosive, until early 1945 when the US Army cooperated with the US monthly publication Popular Science on

420-499: A large and detailed article on the subject titled "It makes steel flow like mud". It was this article that revealed to the American public how the fabled bazooka actually worked against tanks and that the velocity of the rocket was irrelevant. After the war, HEAT rounds became almost universal as the primary anti-tank weapon. Models of varying effectiveness were produced for almost all weapons from infantry weapons like rifle grenades and

480-422: A metal liner inside the warhead into a high-velocity shaped charge jet; this is capable of penetrating armor steel to a depth of seven or more times the diameter of the charge (charge diameters, CD). The shaped charge jet armor penetration effect is purely kinetic in nature; the round has no explosive or incendiary effect on the armor. Unlike standard armor-piercing rounds , a HEAT warhead's penetration performance

540-529: A new infantry anti-tank weapon was needed, and this ultimately came in the form of the "projector, infantry, anti-tank" or PIAT. By 1942, the PIAT had been developed by Major Millis Jefferis . It was a combination of a HEAT warhead with a spigot mortar delivery system. While cumbersome, the weapon allowed British infantry to engage armor at range for the first time. The earlier magnetic hand-mines and grenades required them to approach dangerously near. During World War II

600-484: A ready to fire mode in which the launcher is extended to its full length of 1,400 mm (55 in). The warhead is the same high-explosive, dual-purpose (HEDP) as the USMC SMAW. It is effective against masonry and concrete bunkers and lightly armored vehicles. The projectile can penetrate up to 200 mm (8 in) of concrete, 300 mm (12 in) of brick, or 2.1 m (6.9 ft) of sandbags. The warhead

660-612: A rocket motor with a shorter burn time. A candidate developed by Sweden's FFV for Alliant Techsystems (later Honeywell ) replaced the standard high-explosive anti-tank (HEAT) warhead of the M136 AT4 with the same dual purpose warhead used by the USMC SMAW. FFV designated the bunker buster version of the AT4 as the FFV AT8 . In 1996 the McDonnell-Douglas candidate was chosen. In a unique move,

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720-414: A small-diameter shell of the same weight. The lessening of accuracy increases dramatically with range. Paradoxically, this leads to situations when a kinetic armor-piercing projectile is more usable at long ranges than a HEAT projectile, despite the latter having a higher armor penetration. To illustrate this: a stationary Soviet T-62 tank, firing a (smoothbore) cannon at a range of 1000 meters against

780-404: A target moving 19 km/h was rated to have a first-round hit probability of 70% when firing a kinetic projectile . Under the same conditions, it could expect 25% when firing a HEAT round. This affects combat on the open battlefield with long lines of sight; the same T-62 could expect a 70% first-round hit probability using HEAT rounds on target at 500 meters. Additionally, a warhead's diameter

840-478: Is activated by a crush switch in its nose that can distinguish between hard and soft targets. On soft targets, such as sandbags, detonation is delayed until the projectile is buried in the target, producing a devastating effect. On hard targets, detonation occurs immediately on contact. The conferees of the National Defense Authorization Act for Fiscal Year 1994 agreed that the US Army's BDM and

900-507: Is defined by explosive power, HEAT rounds were particularly useful in long-range combat where slower terminal velocity was not an issue. The Germans were again the ones to produce the most capable gun-fired HEAT rounds, using a driving band on bearings to allow it to fly unspun from their existing rifled tank guns. The HEAT round was particularly useful to them because it allowed the low-velocity large-bore guns used on their many assault guns to also become useful anti-tank weapons. Likewise,

960-414: Is in high-speed physics. He extended the research of Ernst Mach and Fritz Ahlborn, resulting in more than 1,000 publications. He influenced the development of electro- and high-speed exposures, electro-optical photography and high-speed cinematography with illumination by electric spark and flash x-rays. He developed high-speed measurement techniques, at first for the specific problems of ballistics, to

1020-489: Is mainly restricted to lightly armored areas of MBTs—the top, belly and rear armored areas, for example. It is well suited for use in the attack of other less heavily armored fighting vehicles (AFVs) and for breaching material targets (buildings, bunkers, bridge supports, etc.). The newer rod projectiles may be effective against the more heavily armored areas of MBTs. Weapons using the SEFOP principle have already been used in combat;

1080-590: Is reduced by the higher first round hit rate of the Abrams with its improved fire control system compared to that of the M60. Another variant of HEAT warheads surround the warhead with a conventional fragmentation casing, to increase its effectiveness against unarmored targets, while remaining effective in the anti-armor role. In some cases, this is merely a side effect of the armor-piercing design, whilst other designs specifically incorporate this dual role ability. Improvements to

1140-547: Is restricted by a gun's caliber if it is contained within the barrel. In non-gun applications, when HEAT warheads are delivered with missiles , rockets , bombs , grenades , or spigot mortars, the warhead size is no longer a limiting factor. In these cases, HEAT warheads often seem oversized in relation to the round's body. Classic examples of this include the German Panzerfaust and Soviet RPG-7 . Many HEAT-armed missiles today have two (or more) separate warheads (termed

1200-417: Is unaffected by the projectile's velocity, allowing them to be fired by lower-powered weapons that generate less recoil . The performance of HEAT weapons has nothing to do with thermal effects, with HEAT being simply an acronym . HEAT warheads were developed during World War II , from extensive research and development into shaped charge warheads. Shaped charge warheads were promoted internationally by

1260-590: The Mistel weapon. These so-called Schwere Hohlladung (heavy shaped charge) warheads were intended for use against heavily armored battleships . Operational versions weighed nearly two tons and were perhaps the largest HEAT warheads ever deployed. A five-ton version code-named Beethoven was also developed. Meanwhile, the British No. 68 AT rifle grenade was proving to be too light to deal significant damage, resulting in it rarely being used in action. Due to these limits,

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1320-619: The Püppchen , Panzerschreck and Panzerfaust were introduced. The Panzerfaust and Panzerschreck (tank fist and tank terror, respectively) gave the German infantryman the ability to destroy any tank on the battlefield from 50 to 150 meters with relative ease of use and training (unlike the British PIAT ). The Germans made use of large quantities of HEAT ammunition in converted 7.5 cm Pak 97/38 guns from 1942, also fabricating HEAT warheads for

1380-860: The M203 grenade launcher , to larger dedicated anti-tank systems like the Carl Gustav recoilless rifle . When combined with the wire-guided missile , infantry weapons were able to operate at long-ranges also. Anti-tank missiles altered the nature of tank warfare from the 1960s to the 1990s; due to the tremendous penetration of HEAT munitions, many post-WWII main battle tanks , such as the Leopard 1 and AMX-30 , were deliberately designed to carry modest armour in favour of reduced weight and better mobility. Despite subsequent developments in vehicle armour , HEAT munitions remain effective to this day. The jet moves at hypersonic speeds in solid material and therefore erodes exclusively in

1440-463: The Stielgranate 41 , introducing a round that was placed over the end on the outside of otherwise obsolete 37 millimetres (1.5 in) anti-tank guns to produce a medium-range low-velocity weapon. Adaptations to existing tank guns were somewhat more difficult, although all major forces had done so by the end of the war. Since velocity has little effect on the armor-piercing ability of the round, which

1500-927: The 20th-century patriarch of Schlieren photography and Shadowgraph imaging. From autumn 1935 to spring 1936, Schardin accompanied Cranz to China, where they established a ballistics institute in Nanking for the Chinese military. During his stay in China, Schardin received an appointment as head of the Institute for Technical Physics and Ballistics of the Technical College of the German Air Force (TAL) in Berlin-Gatow. He returned to Germany, where he focused his work on ballistic studies and solid mechanics, especially glass technology and

1560-565: The British referred to the Monroe effect as the "cavity effect on explosives". During the war, the French communicated Mohaupt's technology to the U.S. Ordnance Department, and he was invited to the US, where he worked as a consultant on the bazooka project. The need for a large bore made HEAT rounds relatively ineffective in existing small-caliber anti-tank guns of the era. Germany worked around this with

1620-471: The German 150 millimetres (5.9 in) guns (the Japanese 70  mm Type 92 battalion gun and Italian 65 mm mountain gun also had HEAT rounds available for them by 1944 but they were not very effective). High-explosive anti-tank rounds caused a revolution in anti-tank warfare when they were first introduced in the later stages of World War II. One infantryman could effectively destroy any existing tank with

1680-463: The Germans, Italians, and Japanese had in service many obsolescent infantry guns , short-barreled, low-velocity artillery pieces capable of direct and indirect fire and intended for infantry support, similar in tactical role to mortars ; generally an infantry battalion had a battery of four or six. High-explosive anti-tank rounds for these old infantry guns made them semi-useful anti-tank guns, particularly

1740-562: The Marine Corps' short-range assault weapon ( SRAW ) were too similar to justify separate long-term projects, and that the Army should pursue an interim BDM program. Congress limited BDM procurement to 6,000 units. Two candidates were evaluated for the Army's BDM program. A candidate from McDonnell-Douglas (later Talley Defense Systems) used the same warhead as the Marine Corps SMAW, but with

1800-673: The Swiss inventor Henry Mohaupt , who exhibited the weapon before World War II. Before 1939, Mohaupt demonstrated his invention to British and French ordnance authorities. Concurrent development by the German inventors’ group of Cranz, Schardin , and Thomanek led to the first documented use of shaped charges in warfare, during the successful assault on the fortress of Eben Emael on 10 May 1940. Claims for priority of invention are difficult to resolve due to subsequent historic interpretations, secrecy, espionage, and international commercial interest. The first British HEAT weapon to be developed and issued

1860-610: The US Army ordered one batch of 1,500 then a second batch of 4,500 which were placed in contingency storage for expedited issue to units in combat. The SMAW-D was delivered to the Army in 1999. CNN news footage showed US Army Rangers firing M141s at various fortified caves during the Tora Bora operations against the Afghan Taliban and al Qaeda , being mistaken by the CNN reporters for M136 AT4 projectiles. Quantities of M141s were sent to

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1920-597: The Ukrainian armed forces by the US before the invasion of Ukraine by Russia in February 2022. Since then, the missile has also been employed successfully against Russian vehicles. High-explosive anti-tank#High-explosive dual-purpose High-explosive anti-tank ( HEAT ) is the effect of a shaped charge explosive that uses the Munroe effect to penetrate heavy armor. The warhead functions by having an explosive charge collapse

1980-708: The University, and it became the Ernst-Mach Institute (EMI) of the Fraunhofer Society. After some initial restrictions imposed by the occupying powers after World War II, Schardin was soon able to pursue new research topics in the Department of Applied Physics, and after 1955 at EMI. He was awarded by the German Glass Technical Society's "Georg-Gehlhoff-Ring" in 1958 for his successful research on

2040-531: The armor of main battle tanks have reduced the usefulness of HEAT warheads by making effective man portable HEAT missiles heavier, although many of the world's armies continue to carry man-portable HEAT rocket launchers for use against vehicles and bunkers. In unusual cases, shoulder-launched HEAT rockets are believed to have shot down U.S. helicopters in Iraq. The reason for the ineffectiveness of HEAT munitions against modern main battle tanks can be attributed in part to

2100-524: The common defense, an early step in the modern European renaissance. After the establishment of the ISL, Schardin sought contact with the nearby German University in Freiburg im Breisgau. There he was appointed at the Albert-Ludwigs-University in 1947 as Honorary Professor of Technical Physics, and he founded the Department of Applied Physics. This department spun off in 1959 from direct association with

2160-782: The development of shaped-charge explosives, which are now used by the military for armor-piercing weapons. Since 1969, the International Congress for High-Speed Photography and Photonics ICHSPP (with the assistance of the Association for High-Speed Physics) has awarded the Hubert Schardin Medal in his honor. Schardin attended high school in Slupsk , where he passed his final secondary-school examinations in 1922. He then studied physics at Technische Hochschule Berlin-Charlottenburg (today Technische Universität Berlin ) where he took

2220-528: The diploma exam in Technical Physics in 1926. From 1927 to 1929 Schardin worked as private assistant, and then from 1930 to 1935 as a permanent assistant to the famous German ballistics Professor Carl Cranz . In 1934 he earned his PhD with honors, delivering a dissertation on the Toepler Schlieren photography method under the guidance of Cranz. This and later publications on this topic made Schardin

2280-620: The effectiveness of gun-fired single charge HEAT rounds being lessened, or even negated by increasingly sophisticated armoring techniques, a class of HEAT rounds termed high-explosive anti-tank multi-purpose , or HEAT-MP, has become more popular. These are HEAT rounds that are effective against older tanks and light armored vehicles but have improved fragmentation, blast and fuzing. This gives the projectiles an overall reasonable light armor and anti-personnel and material effect so that they can be used in place of conventional high-explosive rounds against infantry and other battlefield targets. This reduces

2340-627: The field of civil defense against nuclear weapons and their blast effects. In 1954 Schardin signed the contract for taking over the Z4 computer to the ISL. Together with the French General and Engineer Robert Cassagnou, Schardin upheld the Institute until it was converted in 1959 - after two years of negotiation - to the German-French Research Institut Saint-Louis (ISL) [4]. Long-time enemies France and Germany had now united for

2400-605: The first HEAT round to be fired by a gun, the 7.5 cm Gr.38 Hl/A, (later editions B and C) fired by the KwK.37 L/24 of the Panzer IV tank and the StuG III self-propelled gun . In mid-1941, Germany started the production of HEAT rifle-grenades, first issued to paratroopers and, by 1942, to the regular army units ( Gewehr-Panzergranate 40 , 46 and 61 ), but, just as did the British, soon turned to integrated warhead-delivery systems: In 1943,

2460-506: The first penetrates the spaced armor, the second the reactive or first layers of armor, and the third one finishes the penetration. The total penetration value may reach up to 800 millimetres (31 in). Some anti-armor weapons incorporate a variant on the shaped charge concept that, depending on the source, can be called an explosively formed penetrator (EFP), self-forging fragment (SFF), self-forging projectile (SEFOP), plate charge , or Misnay Schardin (MS) charge. This warhead type uses

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2520-672: The fragments strike. Another damage mechanism is the mechanical shock that results from the jet's impact and penetration. Shock is particularly important for such sensitive components as electronics . Spinning imparts centrifugal force onto a warhead's jet, dispersing it and reducing effectiveness. This became a challenge for weapon designers: for a long time, spinning a shell was the most standard method to obtain good accuracy, as with any rifled gun. Most hollow charge projectiles are fin-stabilized and not spin-stabilized. In recent years, it has become possible to use shaped charges in spin-stabilized projectiles by imparting an opposite spin on

2580-452: The grenade was armed by removing a pin in the tail which prevented the firing pin from flying forward. Simple fins gave it stability in the air and, provided the grenade hit the target at the proper angle of 90 degrees, the charge would be effective. Detonation occurred on impact, when a striker in the tail of the grenade overcame the resistance of a creep spring and was thrown forward into a stab detonator . By mid-1940, Germany introduced

2640-566: The high-speed physics of glass fracture. On 1 December 1937 he was appointed as an associate professor, and in 1942 as a full professor at Technische Hochschule Berlin, where he was active until 1945. At war's end, the Institute for Technical Physics and Ballistics in Gatow was transferred to Biberach an der Riß in Southern Germany. After World War II a competition began among the Allies to acquire

2700-478: The impact. More modern SFF warhead versions, through the use of advanced initiation modes, can also produce rods (stretched slugs), multi-slugs and finned projectiles, and this in addition to the standard short L to D ratio projectile. The stretched slugs are able to penetrate a much greater depth of armor, at some loss to BAD. Multi-slugs are better at defeating light or area targets and the finned projectiles have greatly enhanced accuracy. The use of this warhead type

2760-530: The interaction of the detonation waves, and to a lesser extent the propulsive effect of the detonation products, to deform a dish or plate of metal (iron, tantalum, etc.) into a slug-shaped projectile of low length-to-diameter ratio and project this towards the target at around two kilometers per second. The SFF is relatively unaffected by first-generation reactive armor, it can also travel more than 1,000 cone diameters (CDs) before its velocity becomes ineffective at penetrating armor due to aerodynamic drag, or hitting

2820-400: The jet so that the two spins cancel out and result in a non-spinning jet. This is done either using fluted copper liners, which have raised ridges, or by forming the liner in such a way that it has a crystalline structure which imparts spin to the jet. Besides spin-stabilization, another problem with any barreled weapon (that is, a gun) is that a large-diameter shell has worse accuracy than

2880-708: The knowledge of German scientists and engineers. The Technical College of the German Air Force, presided over by Schardin, was a particular goal of France and the USA. Schardin was invited by France to work with his team for the French government in the Alsatian town of Saint-Louis, near the West-German border. He was also offered positions in the United States of America , who made the mistake of not inviting his research team as well. Always loyal to his colleagues, Schardin chose to take

2940-411: The local area where it interacts with armor material. The correct detonation point of the warhead and spacing is critical for optimal penetration, for two reasons: An important factor in the penetration performance of a HEAT round is the diameter of the warhead . As the penetration continues through the armor, the width of the hole decreases leading to a characteristic fist to finger penetration, where

3000-523: The newly developed M247 70 millimeter (2.8 in) HEAT rockets, which were yet untested in the theatre of war. The helicopters destroyed three T-54 tanks that were about to overrun a U.S. command post. McIntyre and McKay engaged first, destroying the lead tank. Schardin Hubert Hermann Reinhold Schardin (17 June 1902 Plassow – 27 September 1965 in Freiburg im Breisgau ) was

3060-742: The physics of glass. He also received the DuPont Medal of the US Society of Motion Picture and Television Engineers. In 1960, a former quarry in the experimental zone near Efringen-Kirchen was converted to perform explosives and simulation studies led by Schardin. In October 1964, Professor Schardin was appointed Head of Military Technology in the Ministry of Defense of the Federal Republic of Germany. Hubert Schardin married Irma née Jacob in 1937, and they raised four daughters. He died on 27 September 1965 of

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3120-650: The position in France. On 1 August 1945 he, along with 32 other German scientists, became French civil servants working in Saint-Louis. He continued to live in Germany though, residing in nearby Weil am Rhein . Schardin, now Director of Science and Technology, continued his studies at the institute in Saint-Louis on high-speed physics and glass fracture. In the environment of military research, he also studied explosions and detonations. Beginning in 1954 he conducted research mainly in

3180-539: The preferred material in constructing older armored fighting vehicles . Spaced armor and slat armor are also designed to defend against HEAT rounds, protecting vehicles by causing premature detonation of the explosive at a relatively safe distance away from the main armor of the vehicle. Some cage defenses work by destroying the mechanism of the HEAT round. Helicopters have carried anti-tank guided missiles (ATGM) tipped with HEAT warheads since 1956. The first example of this

3240-504: The size of the eventual finger is based on the size of the original fist . In general, very early HEAT rounds could expect to penetrate armor of 150% to 250% of their diameters, and these numbers were typical of early weapons used during World War II. Since then, the penetration of HEAT rounds relative to projectile diameters has steadily increased as a result of improved liner material and metal jet performance. Some modern examples claim numbers as high as 700%. As for any antiarmor weapon,

3300-570: The smart submunitions in the CBU-97 cluster bomb used by the US Air Force and US Navy in the 2003 Iraq war used this principle, and the US Army is reportedly experimenting with precision-guided artillery shells under Project SADARM (Seek And Destroy Armor). There are also various other projectiles (BONUS, DM 642) and rocket submunitions (Motiv-3M, DM 642) and mines (MIFF, TMRP-6) that use the SFF principle. With

3360-448: The target becomes a problem. The impact of an SFF normally causes a large diameter, but relatively shallow hole (relative to a shaped charge) or, at best, a few CDs. If the SFF perforates the armor, extensive behind-armor damage (BAD, also called behind-armor effect (BAE)) occurs. The BAD is mainly caused by the high temperature and velocity armor and slug fragments being injected into the interior space and also overpressure (blast) caused by

3420-511: The total number of rounds that need to be carried for different roles, which is particularly important for modern tanks like the M1 Abrams , due to the size of their 120 millimetres (4.7 in) rounds. The M1A1/M1A2 tank can carry only 40 rounds for its 120 mm M256 gun—the M60A3 Patton tank (the Abrams' predecessor), carried 63 rounds for its 105 millimetres (4.1 in) M68 gun. This effect

3480-440: The use of new types of armor. The jet created by the explosion of the HEAT round must be a certain distance from the target and must not be deflected. Reactive armor attempts to defeat this with an outward directed explosion under the impact point, causing the jet to deform and so greatly reducing penetrating power. Alternatively, composite armor featuring ceramics erode the liner jet faster than rolled homogeneous armor steel,

3540-510: Was a rifle grenade using a 63.5 millimetres (2.50 in) cup launcher on the end of the rifle barrel; the Grenade, Rifle No. 68 /AT which was first issued to the British Armed Forces in 1940. This has some claim to have been the first HEAT warhead and launcher in use. The design of the warhead was simple and was capable of penetrating 52 millimetres (2.0 in) of armor. The fuze of

3600-828: Was the use of the Nord SS.11 ATGM on the Aérospatiale Alouette II helicopter by the French Armed Forces . After then, such weapon systems were widely adopted by other nations. On 13 April 1972—during the Vietnam War —Americans Major Larry McKay, Captain Bill Causey, First Lieutenant Steve Shields, and Chief Warrant Officer Barry McIntyre became the first helicopter crew to destroy enemy armor in combat. A flight of two AH-1 Cobra helicopters, dispatched from Battery F, 79th Artillery , 1st Cavalry Division , were armed with

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