Armoured fighting vehicle
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An armoured fighting vehicle (British English) or armored fighting vehicle (American English) (AFV) is an armed combat vehicle protected by armour, generally combining operational mobility with offensive and defensive capabilities. AFVs can be wheeled or tracked. Examples of AFVs are tank destroyers, armoured cars, assault guns, self-propelled artilleries, infantry fighting vehicles (IFV), and armoured personnel carriers (APC).
Armoured fighting vehicles are classified according to their characteristics and intended role on the battlefield. The classifications are not absolute; two countries may classify the same vehicle differently, and the criteria change over time. For example, relatively lightly armed armoured personnel carriers were largely superseded by infantry fighting vehicles with much heavier armament in a similar role.
Successful designs are often adapted to a wide variety of applications. For example, the MOWAG Piranha, originally designed as an APC, has been adapted to fill numerous roles such as a mortar carrier, infantry fighting vehicle, and assault gun.
Armoured fighting vehicles began to appear in use in World War I with the armoured car, the tank, the self-propelled gun, and the personnel carrier seeing use. By World War II, armies had large numbers of AFVs, together with other vehicles to carry troops this permitted highly mobile manoeuvre warfare.
Evolution
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The concept of a highly mobile and protected fighting unit has been around for centuries; from Hannibal's war elephants to Leonardo's contraptions, military strategists endeavoured to maximize the mobility and survivability of their soldiers.
Armoured fighting vehicles were not possible until internal combustion engines of sufficient power became available at the start of the 20th century.
History
[edit]Pre-modern
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Modern armoured fighting vehicles represent the realization of an ancient concept – that of providing troops with mobile protection and firepower. Armies have deployed war machines and cavalries with rudimentary armour in battle for millennia. Use of these animals and engineering designs sought to achieve a balance between the conflicting needs of mobility, firepower and protection.
Siege machine
[edit]Siege engines, such as battering rams and siege towers, would often be armoured in order to protect their crews from enemy action. Polyidus of Thessaly developed a very large movable siege tower, the helepolis, as early as 340 BC, and Greek forces used such structures in the Siege of Rhodes (305 BC).
The idea of a protected fighting vehicle has been known since antiquity. Frequently cited is Leonardo da Vinci's 15th-century sketch of a mobile, protected gun-platform; the drawings show a conical, wooden shelter with apertures for cannons around the circumference. The machine was to be mounted on four wheels which would be turned by the crew through a system of hand cranks and cage (or "lantern") gears. Leonardo claimed: "I will build armoured wagons which will be safe and invulnerable to enemy attacks. There will be no obstacle which it cannot overcome."[1] Modern replicas have demonstrated that the human crew would have been able to move it over only short distances.
War wagon
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Hussite forces in Bohemia developed war wagons – medieval horse-drawn wagons that doubled as wagon forts – around 1420 during the Hussite Wars. These heavy wagons were given protective sides with firing slits; their heavy firepower came from either a cannon or from a force of hand-gunners and crossbowmen, supported by light cavalry and infantry using pikes and flails. Heavy arquebuses mounted on wagons were called arquebus à croc. These carried a ball of about 3.5 ounces (100 g).[2]
Modern
[edit]By the end of World War II, most modern armies had vehicles to carry infantry, artillery and anti-aircraft weaponry. Most modern AFVs are superficially similar in design to their World War II counterparts, but with significantly better armour, weapons, engines, electronics, and suspension. The increase in the capacity of transport aircraft makes possible and practicable the transport of AFVs by air. Many armies are replacing some or all of their traditional heavy vehicles with lighter airmobile versions, often with wheels instead of tracks.
Armored road trains
[edit]In the spring of 1900 Lord Roberts ordered six armored road trains for use in South Africa; in December 1901 four armored road trains were delivered after testing. Each train was pulled by a John Fowler & Co steam tractor; with three armored wagons that could be used to carry troops and supplies. However these engines had their armor removed after being delivered, and were used by the Imperial Military Railway.[3][4][5][6]
Armed and armoured car
[edit]The first modern AFVs were armed cars, dating back virtually to the invention of the motor car. The British inventor F. R. Simms designed and built the Motor Scout in 1898. It was the first armed, petrol-engine powered vehicle ever built. It consisted of a De Dion-Bouton quadracycle with a Maxim machine gun mounted on the front bar. An iron shield offered some protection for the driver from the front, but it lacked all-around protective armour.[7]
The armoured car was the first modern fully armoured fighting vehicle. The first of these was the Simms's Motor War Car, also designed by Simms and built by Vickers, Sons & Maxim in 1899.[8] The vehicle had Vickers armour 6 mm thick and was powered by a four-cylinder 3.3-litre[8] 16 hp Cannstatt Daimler engine giving it a maximum speed of around 9 miles per hour (14 kilometres per hour). The armament, consisting of two Maxim guns, was carried in two turrets with 360° traverse.[9][10]
Another early armoured car of the period was the French Charron, Girardot et Voigt 1902, presented at the Salon de l'Automobile et du cycle in Brussels, on 8 March 1902.[11] The vehicle was equipped with a Hotchkiss machine gun, and with 7 mm armour for the gunner.[12][13]
The Spanish Schneider-Brillié was the first armored vehicle to be used in combat, being first used in the Kert Campaign. The vehicle was equipped with two machineguns and built from a bus chassis.[14]
Armored cars also saw limited use in the Italo-Turkish War.[15][16]
Armoured cars were first used in large numbers on both sides during World War I as scouting vehicles.
F. R. Simms's Motor Scout, built in 1898 as an armed car
F. R. Simms's 1902 Motor War Car, the first armoured car to be built
Tank
[edit]In 1903, H. G. Wells published the short story "The Land Ironclads," positing indomitable war machines that would bring a new age of land warfare, the way steam-powered ironclad warships had ended the Age of Sail.
Wells's literary vision was realized in 1916, when, amidst the pyrrhic standstill of the Great War, the British Landship Committee deployed revolutionary armoured vehicles to break the stalemate. The tank was envisioned as an armoured machine that could cross ground under fire from machine guns and reply with its own mounted machine guns and naval artillery. These first British tanks of World War I moved on caterpillar tracks that had substantially lower ground pressure than wheeled vehicles, enabling them to pass the muddy, pocked terrain and slit trenches of the Battle of the Somme.
Troop transport
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The tank eventually proved highly successful and, as technology improved, it became a weapon that could cross large distances at much higher speeds than supporting infantry and artillery. The need to provide the units that would fight alongside the tank led to the development of a wide range of specialised AFVs, especially during the Second World War (1939–1945).
The armoured personnel carrier, designed to transport infantry troops to the frontline, emerged towards the end of World War I. During the first actions with tanks, it had become clear that close contact with infantry was essential in order to secure ground won by the tanks. Troops on foot were vulnerable to enemy fire, but they could not be transported in the tank because of the intense heat and noxious atmosphere.[17] In 1917, Lieutenant G. J. Rackham was ordered to design an armoured vehicle that could fight and carry troops or supplies. The Mark IX tank was built by Armstrong, Whitworth & Co., although just three vehicles had been finished at the time of the Armistice in November 1918, and only 34 were built in total.
Tankette
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Different tank classifications emerged in the interwar period. The tankette was conceived as a mobile, two-man model, mainly intended for reconnaissance. In 1925, Sir John Carden and Vivian Loyd produced the first such design to be adopted – the Carden Loyd tankette. Tankettes saw use in the Royal Italian Army during the Italian invasion of Ethiopia (1935–1936), the Spanish Civil War (1936–1939), and during World War II. The Imperial Japanese Army used tankettes in China for infantry support, reconnaissance and later for jungle warfare.[18][19][20]
Self-propelled artillery
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The British Gun Carrier Mark I, the first Self-propelled artillery, was fielded in 1917. It was based on the first tank, the British Mark I, and carried a heavy field-gun. The next major advance was the Birch gun (1925), developed for the British motorised warfare experimental brigade (the Experimental Mechanized Force). This mounted a field gun, capable of the usual artillery trajectories and even anti-aircraft use, on a tank chassis.
During World War II, most major military powers developed self-propelled artillery vehicles. These had guns mounted on a tracked chassis (often that of an obsolete or superseded tank) and provided an armoured superstructure to protect the gun and its crew. The first British design, "Bishop", carried the 25 pdr gun-howitzer in an extemporised mounting on a tank chassis that severely limited the gun's performance. It was replaced by the more effective Sexton. The Germans built many lightly armoured self-propelled anti-tank guns using captured French equipment (for example Marder I), their own obsolete light tank chassis (Marder II), or ex-Czech chassis (Marder III). These led to better-protected tank destroyers, built on a medium-tank chassis such as the Jagdpanzer IV or the Jagdpanther.
Anti-aircraft vehicle
[edit]The Self-propelled anti-aircraft weapon debuted in WWI. The British QF 3-inch 20 cwt was mounted on trucks for use on the Western Front. Although the Birch gun was a general purpose artillery piece on an armoured tracked chassis, it was capable of elevation for anti-aircraft use. Vickers Armstrong developed one of the first SPAAGs based on the chassis of the Mk.E 6-ton light tank/Dragon Medium Mark IV tractor, mounting a Vickers QF-1 "Pom-Pom" gun of 40 mm. The Germans fielded the Sd.Kfz. 10/4 and 6/2, cargo halftracks mounting single 20 mm or 37 mm AA guns (respectively) by the start of the war.
Self-propelled multiple rocket-launcher
[edit]Rocket launchers such as the Soviet Katyusha originated in the late 1930s. The Wehrmacht fielded self-propelled rocket artillery in World War II – the Panzerwerfer and Wurfrahmen 40 equipped half-track armoured fighting vehicles. Many modern multiple rocket launchers are self propelled by either truck or tank chassis.
Survivability
[edit]The level of armour protection between AFVs varies greatly – a main battle tank will normally be designed to take hits from other tank guns and anti-tank missiles, whilst light reconnaissance vehicles are often only armoured "just in case". Whilst heavier armour provides better protection, it makes vehicles less mobile (for a given engine power), limits its air-transportability, increases cost, uses more fuel and may limit the places it can go – for example, many bridges may be unable to support the weight of a main battle tank. A trend toward composite armour is taking the place of steel – composites are stronger for a given weight, allowing the tank to be lighter for the same protection as steel armour, or better protected for the same weight. Armour is being supplemented with active protection systems on a number of vehicles, allowing the AFV to protect itself from incoming projectiles.
The level of protection also usually varies considerably throughout the individual vehicle too, depending on the role of the vehicle and the likely direction of attack. For example, a main battle tank will usually have the heaviest armour on the hull front and the turret, lighter armour on the sides of the hull and the thinnest armour on the top and bottom of the tank. Other vehicles – such as the MRAP family – may be primarily armoured against the threat from IEDs and so will have heavy, sloped armour on the bottom of the hull.
In modern 21st century warfare, where satellites, drones, and mobile phones tend to erase the signature fog of war, survivability often is not about armor thickness, and instead is about time management. The shorter an AFV's signature window, the harder they are to disable.
Lethality
[edit]Weaponry varies by a very wide degree between AFVs – lighter vehicles for infantry carrying, reconnaissance or specialist roles may have only a autocannon or machine gun (or no armament at all), whereas heavy self-propelled artillery will carry howitzers, mortars or rocket launchers. These weapons may be mounted on a pintle, affixed directly to the vehicle or placed in a turret or cupola.
The greater the recoil of the weapon on an AFV, the larger the turret ring needs to be. A larger turret ring necessitates a larger vehicle. To avoid listing to the side, turrets on amphibious vehicles are usually located at the centre of the vehicle.[21]
Grenade launchers may provide a versatile launch platform for a plethora of munitions including smoke, phosphorus, tear gas, illumination, anti-personnel, infrared and radar-jamming rounds.[21]
Turret stabilization is an important capability because it enables firing on the move and prevents crew fatigue.
Maneuverability
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Modern AFVs have primarily used either petrol (gasoline) or diesel piston engines. More recently, gas turbines have been used. Most early AFVs used petrol engines, as they offer a good power-to-weight ratio. However, they fell out of favour during World War II due to the flammability of the fuel.
Most current AFVs are powered by a diesel engine; modern technology, including the use of turbo-charging, helps to overcome the lower power-to-weight ratio of diesel engines compared to petrol.[22]
Gas turbine (turboshaft) engines offer a very high power-to-weight ratio and were starting to find favour in the late 20th century – however, they offer very poor fuel consumption [22] and as such some armies are switching from gas turbines back to diesel engines (i.e. the Russian T-80 used a gas turbine engine, whereas the later T-90 does not). The US M1 Abrams is a notable example of a gas turbine powered tank.[23]
Modern classification by type and role
[edit]Notable armoured fighting vehicles extending from post-World War I to today.
Tank
[edit]The tank is an all terrain AFV incorporating artillery which is designed to fill almost all battlefield roles and to engage enemy forces by the use of direct fire in the frontal assault role. Though several configurations have been tried, particularly in the early experimental "golden days" of tank development, a standard, mature design configuration has since emerged to a generally accepted pattern. This features a main tank gun or artillery gun, mounted in a fully rotating turret atop a tracked automotive hull, with various additional secondary weapon systems throughout.
Philosophically, the tank is, by its very nature, an offensive weapon. Being a protective encasement with at least one gun position, it is essentially a pillbox or small fortress (though these are static fortifications of a purely defensive nature) that can move toward the enemy – hence its offensive utility. Psychologically, the tank is a force multiplier that has a positive morale effect on the infantry it accompanies.[24] It also instills fear in the opposing force who can often hear and even feel their arrival.[25]
Tank classifications
[edit]Tanks were classified either by size or by role.
Classification by relative size was common, as this also tended to influence the tanks' role.
- Light tanks are smaller tanks with thinner armour and lower-powered guns, allowing for better tactical mobility, amphibious and airdrop options, and ease of strategic transport. These are intended for armoured reconnaissance, skirmishing, artillery observation, expeditionary warfare and supplementing airborne or naval landings. Light tanks are typically cheaper to build and maintain, but fare poorly against heavier tanks. They may be held in reserve for exploiting any breakthroughs in enemy lines, with the goal of disrupting communications and supply lines. The light tank concept emerged during World War I with the French Renault ft17.
- Medium tanks are mid-sized tanks with adequate armour and guns, and fair mobility, allowing for a balance of fighting abilities, mobility, cost-effectiveness, and transportability. Medium tanks are effective in groups when used against enemy tanks. More cost effective and easier to produce than heavier tanks they excelled in various combat roles.
- Heavy tanks are larger tanks with thick armour and more powerful guns, but less mobile and more difficult to transport. They were intended to be overmatch for typical enemy medium tanks, easily penetrating their armour while being much less susceptible to their attacks. Heavy tanks cost more to both build and maintain, and their heavy armour proved most effective when deployed in support infantry assaulting entrenched fortifications. The concept of heavy tanks began in World War I with the British MK1 a large vehicle intended to breach enemy trenches.
Over time, tanks tended to be designed with heavier armour and weapons, increasing the weight of all tanks, so these classifications are relative to the average for the nation's tanks for any given period. An older tank design might be reclassified over time, such as a tank being first deployed as a medium tank, but in later years relegated to light tank roles.
Tanks were designated as Male tank (cannons) or Female tank (machine guns) based on their armament to enable them to operate in teams. Male tanks had six-pounder cannons to destroy fortifications, while female tanks were equipped with only machine guns to defend against infantry. The two types were designed to operate together, with male tanks leading to breach enemy lines and female tanks following to suppress enemy infantry. The introduction of the Hermaphrodite tank (Composite) and Whippet showed a need for tanks to handle multiple roles, leading to universal designs like the Mark VIII (International Tank), though the focus eventually shifted away from giant, slow tanks towards faster, more versatile models after WWI.
Tanks were also classified by roles that were independent of size, such as cavalry tank, cruiser tank, fast tank, infantry tank, "assault" tank, or "breakthrough" tank. Military theorists initially tended to assign tanks to traditional military infantry, cavalry, and artillery roles, but later developed more specialized roles unique to tanks.
In modern use, the heavy tank and tank destroyer has fallen out of favour, being supplanted by more heavily armed and armoured descendant of the medium tanks – the universal main battle tank. The light tank role has been taken over by Infantry Fighting Vehicles, MRAPS, or lost favour to cheaper, faster, lighter armoured cars; however, light tanks (or similar vehicles with other names) are still in service with a number of forces as reconnaissance vehicles, most notably the Russian Marines with the PT-76, the British Army with the Scimitar, and the Chinese Army with the Type 63.
Main battle tank
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United States third-generation M1 Abrams tank
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