Armed helicopter
Encyclopedia
An armed helicopter is a helicopter
Helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by one or more engine-driven rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forwards, backwards, and laterally...

 equipped with weapons. Most commonly, it is used for attacking targets on the ground. Such helicopter could be either purposely designed for the ground-attack mission—in which case it would be more specifically categorized as an attack helicopter
Attack helicopter
An attack helicopter is a military helicopter with the primary role of an attack aircraft, with the capability of engaging targets on the ground, such as enemy infantry and armored vehicles...

—or could be previously designed for other uses, such as utility, cargo, reconnaissance, etc., and the weapons mounts are modifications, rather than part of the design of the helicopter. The purpose of the modification to an armed helicopter configuration can be field expediency during combat, the lack of military funding to develop or purchase attack helicopters, or the need to maintain the helicopter for missions that do not require the weapons.

Specialized armed helicopters fly from ships at sea, and are equipped for antisubmarine warfare or strikes with anti-shipping missiles.

History

Direct fire support delivered by weapons mounted on to helicopters began informally in the Korean War, with United States Marines firing their weapons from the open doors of the aircraft, into the treeline of the landing area below. The concept evolved with the French during the Algerian and the First Indochina
First Indochina War
The First Indochina War was fought in French Indochina from December 19, 1946, until August 1, 1954, between the French Union's French Far East...

 wars, in the form of armed helicopters; where utility, cargo, and observation military helicopters were modified to carry various weapons.

Algerian War

The French Army was one of the first military forces to modify and use helicopters in combat in a ground attack role during the Algerian War of 1954-62. In 1955, French field commanders placed infantry machine gunners in the stretcher panniers of their Bell 47
Bell 47
The Bell 47 is a two-bladed, single engine, light helicopter manufactured by Bell Helicopter. Based on the third Model 30 prototype, Bell's first helicopter designed by Arthur M. Young, the Bell 47 became the first helicopter certified for civilian use on 8 March 1946...

 (Sioux H-13) casualty evacuation helicopters. The ad hoc gunship
Gunship
The term "gunship" is used in several contexts, all sharing the general idea of a light craft armed with heavy guns.-In Navy:In the Navy, the term originally appeared in the mid-19th century as a less-common synonym for gunboat.-In military aviation:...

s were used to reach FLN
National Liberation Front (Algeria)
The National Liberation Front is a socialist political party in Algeria. It was set up on November 1, 1954 as a merger of other smaller groups, to obtain independence for Algeria from France.- Anticolonial struggle :...

 guerrilla positions on otherwise inaccessible mountain ridges and peaks, but were far too underpowered.http://www.acig.org/artman/publish/article_354.shtml

In 1956, the French Air Force experimented with arming the Sikorsky S-55, then being superseded in service by the more capable Piasecki H-21 and Sikorsky CH-34 helicopters. The H-19 was originally fitted with two rocket launchers and an ex-Luftwaffe MG151/20 20-mm
MG 151 cannon
The MG 151 was a 15 mm autocannon produced by Waffenfabrik Mauser starting in 1940. It was in 1941 developed into the 20 mm MG 151/20 cannon which was widely used on many types of German Luftwaffe fighters, fighter bombers, night fighters, ground attack and even bombers as part of or as...

 cannon, both mounted axially on the outside of the aircraft. Later, an MG151/20 cannon, two .50 cal. (12.7-mm) Browning machine guns, and an FN Browning 7.5-mm light machine gun were mounted inside the fuselage at the cabin windows, but this load proved far too heavy, and even more lightly armed H-19 gunships proved underpowered. Some Piasecki H-21 helicopters were armed with fixed, forward-firing rockets and machine guns and a few even had racks for bombs, but the H-21 lacked the maneuverability and performance needed for offensive action. Most H-21s in service were eventually fitted with a single door-mounted 12.7 mm machine gun or an MG151/20 20-mm cannon as defensive armament.

The Sikorsky H-34 was also modified into a gunship by the French Navy: standard armament comprised an MG 151 20-mm cannon firing from the cabin door, two 12.7-mm machine guns firing from the cabin windows to port, plus racks for 37 mm or 68 mm rockets. While the CH-34 was effective in the ground attack role, official evaluations at the time indicated that the CH-21 was more likely to survive multiple hits by ground fire than was the CH-34; this was assumed to be a consequence of the location and construction of the CH-34's fuel tanks. Nevertheless, by the close of the Algerian War, attack helicopters such as the CH-34 were being used in synchronized operations with troop-carrying CH-21 helicopters in large-scale counterinsurgency operations.

Vietnam War

The United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 and the United Kingdom began modifying existing helicopters as anti-submarine weapon
Anti-submarine weapon
An anti-submarine weapon is any one of a range of devices that are intended to act against a submarine, and its crew, to destroy the vessel or to destroy or reduce its capability as a weapon of war...

s (ASW) platforms, carrying depth bombs and Magnetic Anomaly Detector
Magnetic anomaly detector
A magnetic anomaly detector is an instrument used to detect minute variations in the Earth's magnetic field. The term refers specifically to magnetometers used by military forces to detect submarines ; the military MAD gear is a descendent of geomagnetic survey instruments used to search for...

 gear. After learning of French Army experiments, there was a movement within the U.S. Army to arm helicopters. Under the leadership of Colonel
Colonel
Colonel , abbreviated Col or COL, is a military rank of a senior commissioned officer. It or a corresponding rank exists in most armies and in many air forces; the naval equivalent rank is generally "Captain". It is also used in some police forces and other paramilitary rank structures...

 Jay Vanderpool, the U.S. Army modified Sikorsky and other larger helicopters with fixed and flexible-mount machine guns, rockets, and cannon. While Col. Vanderpool was ridiculed by some in the Army, others saw his efforts as a great aid to ground troops. At the time, the Army leadership felt that the U.S. Air Force
United States Air Force
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

 was not doing enough to support ground forces, and due to the Key West Agreement
Key West Agreement
The Key West Agreement is the colloquial name for the policy paper Function of the Armed Forces and the Joint Chiefs of Staff drafted by James V. Forrestal, the first United States Secretary of Defense...

, the Army could not field its own ground attack fixed-wing aircraft.

With the increasing use of the helicopter for infantry transport, the U.S. Army saw a need for specialized helicopters to be used as aerial artillery
Aerial Rocket Artillery
Although sometimes used as a generic term for any armed helicopters, the term Aerial Rocket Artillery refers specifically to the armed helicopter units which were organic to the division artillery of the United States Army’s two airmobile divisions during the Vietnam War...

 to provide fire suppression and ground support close to the battle. The first United States use of the armed helicopter in large-scale combat operations was during the Vietnam War
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

. First the U.S. Army modified UH-1B 'Huey'
UH-1 Iroquois
The Bell UH-1 Iroquois is a military helicopter powered by a single, turboshaft engine, with a two-bladed main rotor and tail rotor. The helicopter was developed by Bell Helicopter to meet the United States Army's requirement for a medical evacuation and utility helicopter in 1952, and first flew...

 helicopters, mounting machine guns and Folding Fin Aerial Rockets (FFAR)
Mk 4/Mk 40 Folding-Fin Aerial Rocket
The Mk 4 Folding-Fin Aerial Rocket , sometimes called the Mighty Mouse, was a 2.75 in diameter unguided rocket weapon commonly used by U.S. military aircraft. It was intended as an air-to-air weapon to allow interceptor aircraft to shoot down enemy bombers with greater range and effectiveness than...

 on struts parallel with the fuselage. Eventually, the U.S. Army would upgrade the engine and rotor to the UH-1C model, and again to the UH-1M model, to overcome power issues as more and more armament was added to the helicopters. But this was not fully satisfactory, so the AH-1 helicopter was developed.

Warsaw Pact

During the 1960s, the Soviet Union
Soviet Union
The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

 saw the need for an armed helicopter and equipped Mil Mi-8
Mil Mi-8
The Mil Mi-8 is a medium twin-turbine transport helicopter that can also act as a gunship. The Mi-8 is the world's most-produced helicopter, and is used by over 50 countries. Russia is the largest operator of the Mi-8/Mi-17 helicopter....

 helicopters with rocket pods. This armed helicopter eventually developed into the Mil Mi-24
Mil Mi-24
The Mil Mi-24 is a large helicopter gunship and attack helicopter and low-capacity troop transport with room for 8 passengers. It is produced by Mil Moscow Helicopter Plant and operated since 1972 by the Soviet Air Force, its successors, and by over thirty other nations.In NATO circles the export...

, which saw extensive action in Afghanistan during the 80s. Mi-24s were also exported in large numbers to many Asian and African countries.

Special operations variants

In the last 20 years US Special Operations Command
United States Special Operations Command
The United States Special Operations Command is the Unified Combatant Command charged with overseeing the various Special Operations Commands of the Army, Air Force, Navy and Marine Corps of the United States Armed Forces. The command is part of the Department of Defense...

 has been developing the special forces gunship, using the MH-60. These helicopters are to be used as an attack element with special operators to do the clean up, or to deliver the operators and support them on the ground. They were used successfully during the Scud Hunt.

Other Army Special Operations include the MH-6
MH-6 Little Bird
The MH-6 Little Bird , and its attack variant AH-6, are light helicopters used for special operations in the United States Army. Originally based on a modified OH-6A, it was later based on the MD 500E, with a single five-bladed main rotor...

 and AH-6
MH-6 Little Bird
The MH-6 Little Bird , and its attack variant AH-6, are light helicopters used for special operations in the United States Army. Originally based on a modified OH-6A, it was later based on the MD 500E, with a single five-bladed main rotor...

 "Little Birds". The MH-6 carries special operators on benches outside the helicopters, from which they can move quickly. The AH-6 is for close air support
Close air support
In military tactics, close air support is defined as air action by fixed or rotary winged aircraft against hostile targets that are close to friendly forces, and which requires detailed integration of each air mission with fire and movement of these forces.The determining factor for CAS is...

. The MH-47 Chinook
CH-47 Chinook
The Boeing CH-47 Chinook is an American twin-engine, tandem rotor heavy-lift helicopter. Its top speed of 170 knots is faster than contemporary utility and attack helicopters of the 1960s...

 helicopter has been used to carry special operators using long-wheelbase Land Rovers and other vehicles in and out of an area of operations.

For longer-range special operations, the Air Force had operated the MH-53 Pave Low
MH-53 Pave Low
The Sikorsky MH-53 Pave Low series is a long-range combat search and rescue helicopter for the United States Air Force. The series was upgraded from the HH-53B/C, variants of the Sikorsky CH-53 Sea Stallion. The HH-53 "Super Jolly Green Giant" was initially developed to replace the HH-3 "Jolly...

 helicopter with extensive avionics
Avionics
Avionics are electronic systems used on aircraft, artificial satellites and spacecraft.Avionic systems include communications, navigation, the display and management of multiple systems and the hundreds of systems that are fitted to aircraft to meet individual roles...

 for navigation, flying at very low altitude, and electronic warfare. However the Pave Lows were retired at the end of September 2008, and the role is now being performed by Air Force CV-22 Ospreys.

Helicopters used for bombing

The idea of the helicopter as a bomber
Bomber
A bomber is a military aircraft designed to attack ground and sea targets, by dropping bombs on them, or – in recent years – by launching cruise missiles at them.-Classifications of bombers:...

 has likely been around since helicopters first came into military service. The helicopter offers what might appear to be a highly stable bombing platform, making the idea all the more attractive. The idea is generally used by air forces conducting counterinsurgencies, and often by those lacking traditional fixed wing options.

Helicopter bombing in Vietnam

Likely the first organized usage of a helicopter as a tactical bomber, the United States Army employed the UH-1 Iroquois, CH-47 Chinook
CH-47 Chinook
The Boeing CH-47 Chinook is an American twin-engine, tandem rotor heavy-lift helicopter. Its top speed of 170 knots is faster than contemporary utility and attack helicopters of the 1960s...

, and CH-54 Tarhe
CH-54 Tarhe
|-See also:-External links:* *...

 helicopters. The US Army had already conducted tests using the OH-13 Sioux
Bell 47
The Bell 47 is a two-bladed, single engine, light helicopter manufactured by Bell Helicopter. Based on the third Model 30 prototype, Bell's first helicopter designed by Arthur M. Young, the Bell 47 became the first helicopter certified for civilian use on 8 March 1946...

 fitted with small napalm tanks.

The CH-47 was used most often to assist in the clearing of bunkers, using an improvised bomb made from 55-gallon drums of bulk CS
CS gas
2-chlorobenzalmalononitrile is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent...

 powder, designated Bomb, Fuze, and Burster, CS in 55-gallon Drum, XM920. Thirty of these bombs, containing eighty pounds of CS powder, could be carried by a CH-47, and were used to "saturate base camps, way stations, or infiltration routes to deny their use."

The US Army used the UH-1 with a far wider array of systems. Using the M156 Universal Mount, conventional aircraft dispensers for cluster munitions and mines were fitted. Another system developed was the Mortar Aerial Delivery System or MADS. This system used standard 60mm or 81mm mortar rounds in dispensers mounted on the side of the aircraft, and was to be used against both preplanned targets and targets of opportunity. Pictures show this system in use as late as 1969. Even improvised bombs, made from things such as a "can of engine oil...[and] a thermite grenade" or "four or five concussion grenades...[with] belted M-60 ammunition around the grenades" were used.

The US Army also conducted a number of drops of large bombs using the CH-54 helicopter for the purposes of clearing landing zones. Operational drops were conducted using both modified M121 10,000 lb bombs and the BLU-82/B
BLU-82
The BLU-82B/C-130 weapon system, known under program "Commando Vault" and nicknamed "daisy cutter" in Vietnam and in Afghanistan for its ability to flatten a forest into a helicopter landing zone, is a 15,000 pound conventional bomb, delivered from either a C-130 or an MC-130 transport aircraft....

 15,000 lb bomb. Tests conducted prior to the deployment of weapons and equipment for Operation Combat Trap led to discontinued use of the CH-54 and a switch to the C-130E(I)
C-130 Hercules
The Lockheed C-130 Hercules is a four-engine turboprop military transport aircraft designed and built originally by Lockheed, now Lockheed Martin. Capable of using unprepared runways for takeoffs and landings, the C-130 was originally designed as a troop, medical evacuation, and cargo transport...

 aircraft (later MC-130E).

Both the US Army and US Marine Corps also investigated using the AH-1 Cobra
AH-1 Cobra
The Bell AH-1 Cobra is a two-bladed, single engine attack helicopter manufactured by Bell Helicopter. It shares a common engine, transmission and rotor system with the older UH-1 Iroquois...

 attack helicopter
Attack helicopter
An attack helicopter is a military helicopter with the primary role of an attack aircraft, with the capability of engaging targets on the ground, such as enemy infantry and armored vehicles...

 as a bomber. The Army tested a dispenser system that could be used to drop smoke grenades, while the USMC went further and qualified the aircraft to carry the CBU-55/B
CBU-55
The CBU-55 was a cluster bomb Fuel Air Explosive that was developed during the Vietnam War, by the United States Army, and was used only once in warfare. Unlike most incendiaries, which contained napalm or phosphorus, the 750 pound CBU-55 was fueled primarily by propane. Described as a "the most...

 Fuel Air Explosive
Thermobaric weapon
A thermobaric weapon, which includes the type known as a "fuel-air bomb", is an explosive weapon that produces a blast wave of a significantly longer duration than those produced by condensed explosives. This is useful in military applications where its longer duration increases the numbers of...

. While the USMC continued to qualify their subsequent AH-1 variants for the CBU-55/B weapon, there are no reports of it actually being used in combat.

Helicopter bombing in El Salvador

El Salvador during their conflict with FMLN and other guerrillas between 1980 and 1992, made use of UH-1 Iroquois in the bombing role. UH-1Hs and UH-1Ms flew punitive strikes against villages linked to the FLN dropping 250 and 500 pound bombs. The need for this greater flexibility was required by the nature of the conflict and the lack of resources available to the Salvadoran Air Force. Since the bombs utilized used the same type of mounting hardware as the standard rocket launchers, the FAS used M156 universal mounts and essentially unmodified aircraft.

Helicopter bombing in Lebanon

Helicopter bombing was used by the Lebanese Army
Lebanese Armed Forces
The Lebanese Armed Forces or Forces Armées Libanaises in French, also known as the Lebanese Army according to its official Website The Lebanese Armed Forces (LAF) (Arabic: القوات المسلحة اللبنانية | Al-Quwwāt al-Musallaḥa al-Lubnāniyya) or Forces Armées Libanaises in French, also known as the...

 during the 2007 Siege of Nahr al-Bared
2007 Lebanon conflict
The 2007 Lebanon conflict began when fighting broke out between Fatah al-Islam, an Islamist militant organization, and the Lebanese Armed Forces on May 20, 2007 in Nahr al-Bared, an UNRWA Palestinian refugee camp near Tripoli. It was the most severe internal fighting since Lebanon's 1975–90 civil...

 when it converted UH-1H utility helicopters into bombers due to the urgent need to fight the Fatah al-Islam
Fatah al-Islam
Fatah al-Islam, is a radical Sunni Islamist group that formed in November 2006 in a Palestinian refugee camp, located in Lebanon. It has been described as a militant jihadist movement that draws inspiration from al-Qaeda...

 terrorist group. They mounted 30-year-old 500 lb (250 kg) Mark 82 bomb
Mark 82 bomb
The Mark 82 is an unguided, low-drag general-purpose bomb, part of the U.S. Mark 80 series. The explosive filling is tritonal.-Development and deployment:...

s, originally carried by Hawker Hunter
Hawker Hunter
The Hawker Hunter is a subsonic British jet aircraft developed in the 1950s. The single-seat Hunter entered service as a manoeuvrable fighter aircraft, and later operated in fighter-bomber and reconnaissance roles in numerous conflicts. Two-seat variants remained in use for training and secondary...

 attack aircraft.

Tests and evaluations

Other nations have also made moves toward helicopter bombing, but have not put it into practice. The Soviet Union qualified both the Mil Mi-8
Mil Mi-8
The Mil Mi-8 is a medium twin-turbine transport helicopter that can also act as a gunship. The Mi-8 is the world's most-produced helicopter, and is used by over 50 countries. Russia is the largest operator of the Mi-8/Mi-17 helicopter....

 and Mil Mi-24
Mil Mi-24
The Mil Mi-24 is a large helicopter gunship and attack helicopter and low-capacity troop transport with room for 8 passengers. It is produced by Mil Moscow Helicopter Plant and operated since 1972 by the Soviet Air Force, its successors, and by over thirty other nations.In NATO circles the export...

 to use members of the FAB general purpose bomb family. It is possible these aircraft may have been put into service in this role by the armed forces of Sudan and Sri Lanka.

The Philippines also tested a single Sikorsky H-34 as an attack helicopter, armed with both rockets and bombs on locally fabricated racks. This aircraft appears to have been the extent of the testing, and the Philippines did not introduce any H-34s in this capacity.

See also

  • Air interdiction
    Air interdiction
    Air interdiction is the use of aircraft to attack tactical ground targets that are not in close proximity to friendly ground forces. It differs from close air support because it does not directly support ground operations and is not closely coordinated with ground units...

  • Army aviation
    Army aviation
    Army Aviation refers to aviation-related units of a nation's army, often described as an air corps. These units are generally separate from a nation's dedicated air force, and usually comprise helicopters and light support fixed-wing aircraft....

  • Attack helicopter
    Attack helicopter
    An attack helicopter is a military helicopter with the primary role of an attack aircraft, with the capability of engaging targets on the ground, such as enemy infantry and armored vehicles...

  • Gunship
    Gunship
    The term "gunship" is used in several contexts, all sharing the general idea of a light craft armed with heavy guns.-In Navy:In the Navy, the term originally appeared in the mid-19th century as a less-common synonym for gunboat.-In military aviation:...

  • Close air support
    Close air support
    In military tactics, close air support is defined as air action by fixed or rotary winged aircraft against hostile targets that are close to friendly forces, and which requires detailed integration of each air mission with fire and movement of these forces.The determining factor for CAS is...

  • Tactical bombing
    Tactical bombing
    Tactical bombing is the aerial bombing aimed at targets of immediate military value, such as troops, military installations or equipment. This is in contrast to strategic bombing, attacking enemy's cities and factories to debilitate the enemy's capacity to wage war, the enemy's future military...

  • U.S. Helicopter Armament Subsystems
    U.S. Helicopter Armament Subsystems
    The United States military has developed a number of Helicopter Armament Subsystems since the early 1960s. These systems are used for offensive and defensive purposes and make use of a wide variety of weapon types including, but not limited to machine guns, grenade launchers, autocannon, and rockets...


External links

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