The Mil Mi-8 (Russian: Ми-8, NATO reporting name: Hip) is a medium twin-turbine helicopter, originally designed by the Soviet Union in the 1960s and introduced into the Soviet Air Force in 1968. It is now produced by Russia. In addition to its most common role as a transport helicopter, the Mi-8 is also used as an airborne command post, armed gunship, and reconnaissance platform.
The Mi-8 is the world's most-produced helicopter,[1] with over 17000 units used by over 50 countries. As of 2015, when combined with the related Mil Mi-17, the two helicopters are the third most common operational military aircraft in the world.[2]
Mikhail Mil originally approached the Soviet government with a proposal to design an all-new two-engined turbine helicopter in 1959 after the success of the Mil Mi-4 and the emergence and effectiveness of turbines used in the Mil Mi-6. After design and development, the Mi-8 was subsequently introduced into the Soviet Air Force in 1967.
The Soviet military originally argued against a new helicopter, as they were content with the current Mil Mi-4.[3] To counter this, Mikhail Mil proposed that the new helicopter was more of an update to new turbine engines rather than an entirely new helicopter, which persuaded the council of ministers to proceed with production. Due to the position of the engine, this enabled Mikhail Mil to justify redesigning the entire front half of the aircraft around the single engine.
The prototype, which was named V-8, was designed in 1958[3] and based on the Mil Mi-4 with a larger cabin.[4] Powered by an AI-24 2,010 kW (2,700 shp) Soloviev turboshaft engine,[5] the single engined V-8 prototype had its maiden flight in June 1961[6] [7] and was first shown on Soviet Aviation Day parade (Tushino Air Parade) in July 1961.[8]
During an official visit to the United States in September 1959, Nikita Khrushchev took a flight in the S-58 presidential helicopter for the first time and was reportedly extremely impressed.[9] [10] On Khrushchev's return, he ordered the creation of a similar helicopter, which was to be ready for the return visit by the American president, to save face.[11] A luxury version of the Mi-4 was quickly created and Khrushchev took an inspection flight, during which Mikhail Mil proposed that his helicopter in development was more suitable. However, it would be necessary to have a second engine for reliability.
This gave Mikhail Mil the power under the orders of Khrushchev to build the original two-engined helicopter, which for the first time in Soviet history would need purpose-built turbine engines, rather than those adapted from fixed wing aircraft (as in the Mil Mi-6 and the first prototype V-8) and an entirely new main rotor gear box that would be designed in-house for the first time. In May 1960, the order was given for Mikhail Mil to create his twin engine helicopter. The Sergei Isotov Design Bureau accepted the task of creating the engines.
The second prototype (still equipped with the one turbine engine as the Isotov engines were still under development) flew in September 1961.
Two months after the engines were completed by Isotov, the third prototype designated V-8A equipped with two 1,120 kW (1,500 shp) Isotov TV2 engines, made its first flight piloted by Nikolai Ilyushin on 2 August 1962, marking the first flight of any Soviet helicopter to fly with purpose built gas turbine engines.[4] The aircraft completed its factory based testing in February 1963.
The fourth prototype was designed as a VIP transport, with the rotor changed from four blades to five blades in 1963 to reduce vibration, the cockpit doors replaced by blister perspex slides and a sliding door added to the cabin.[4]
The fifth and final prototype was a mass production prototype for the passenger market. In November 1964, all joint testing had been completed and the Soviet government began mass production. Production started in the Kazan Production Plant, with the first aircraft completed by the end of 1965.
The Soviet military originally showed little interest in the Mi-8 until the Bell UH-1's involvement in the Vietnam War became widely publicised as a great asset to the United States, allowing troops to move swiftly in and out of a battlefield and throughout the country. It was only then that the Soviet military rushed a troop-carrying variant of the Mil Mi-8 into production. By 1967, it had been introduced into the Soviet Air Force as the Mi-8.
There are numerous variants, including the Mi-8T, which, in addition to carrying 24 troops, is armed with rockets and anti-tank guided missiles. The Mil Mi-17 export version is employed by around 20 countries; its equivalent in Russian service in the Mi-8M series. The only visible differences between the Mi-8 and Mi-17 are A) the position of the tail rotor (Mi-8 right side, Mi-17 left side), B) the shape of the exhausts (Mi-8 circular, Mi-17 oval), and C) Dust shields in front of engine air intakes for the Mi-17. Also Mi-17 has some improved armour plating for its crew. The naval Mil Mi-14 version is also derived from the Mi-8.[12]
The Mi-8 is constantly improving and the newest version still remains in production in 2024. However the second generation of the Mi-8 was changed to a tractor-tail rotor configuration as this configuration has increased yaw authority from the upwards advancing tail rotor blades into the downwash. The increase of the airspeed flowing over the rotor blades increases overall tail rotor effectiveness and yaw authority, whereas with the 'Pusher' tail rotor configuration the advancing rotor blade moves downwards. This decreases the airspeed across the rotor blade, reducing its overall effective yaw authority.[12]
The Finnish Defence Forces and the Finnish Border Guard began using Mi-8s in the 1970s, with the Finnish Air Force receiving its first, serialed HS-2, on 28 May 1973, and the second, HS-1, on 31 May 1973. Six Mi-8Ts were obtained at first, followed by further two Mi-8Ts and two Mi-8Ps. Three of the helicopters were handed over to the Border Guard Wing. One of these was lost after sinking through ice during a landing in April 1982. It was soon replaced by a new Mi-8.
After their Border Guard service, the helicopters were transferred to the civil register, but shortly thereafter to the Finnish Air Force. In 1997 it was decided that all helicopters, including the remaining five Mi-8Ts and two Mi-8Ps, should be transferred to the Army Wing at Utti. All Mi-8s have now been retired. One Mi-8 is on display at the Finnish Aviation Museum in Vantaa, and one is at the Päijänne Tavastia Aviation Museum in Asikkala, near Lahti. The two final Mi-8Ts were given to Hungary in August 2011 with all the remaining spare parts.
The Georgian air force started operating Mi-8 and Mi-17 helicopters from 1991 onwards. During the War in Abkhazia (1992–1993) Mi-8 helicopters were used by both sides. Several were shot down, the first being a Georgian civilian Mi-8T which was destroyed in Sukhumi by an RPG-7. On 14 December 1992, a Russian Air Force Mi-8T was shot down by a SA-14 missile near Lata.[13]
On another occasions Abkhaz Mi-8MTVs were shot down by Georgian forces, by SA-14 in one case and by RPG-18 in a second case, both during 1993.[13] In the final case, Georgian Mi-8MTV carrying civilian refugees was shot down, killing 25 people.[13] Georgian Air Force and Police currently operate about 20 Mi-8T/MTVs.[14]
Mi-8s were employed by the former Iraqi Army Aviation and Iraqi Air Force under Saddam Hussein. In the Iran–Iraq War of the 1980s, there were air-to-air combat between Iraqi and Iranian Army Aviation helicopters, including between Iranian Bell AH-1J Cobras and Iraqi Mi-8s.[15]
On 21 December 2012, a Nizhnevartovskavia owned Mi-8 working for the United Nations Mission in South Sudan (UNMISS) was shot down and crashed near Likuangole in the South Sudanese state of Jonglei during the South Sudan internal conflict. All four Russian crewmembers on board were killed, and after some initial confusion, a UN spokesman said that the South Sudanese army confirmed on 22 December that it mistakenly fired at the helicopter.[16] [17]
On 26 August 2014, a UTair Aviation owned Mi-8 working for the United Nations crashed as it approached a landing airstrip near Bentiu. Three of the Russian crew members died and one was injured. Rebel commander Peter Gadet claimed that his forces brought it down using a rocket-propelled grenade.[18] [19]
The Mi-8 family of helicopters became the main Soviet (and later Russian) helicopter, covering a large range of roles in both peace time and war time. Large fleets of Mi-8 and its derivatives were employed by both military and civil operators.
Large numbers of Mi-8 family helicopters were used during the Soviet–Afghan War during the 1980s. Its rugged construction allowed easier in-theater operations and maintenance. A large number of Mi-8s were lost with several shot down by enemy fire, with the Mi-8 and its derivatives being the main aircraft model lost by the Soviet Union in Afghanistan.
Between April and May 1986, Mi-8s were used in large numbers to drop radiation-absorbing materials into the No. 4 reactor of Chernobyl Nuclear Power Plant after the Chernobyl disaster, and the fire was extinguished by the combined effort of helicopters dropping over 5000 metric tons of sand, lead, clay, and neutron-absorbing boron onto the burning reactor and injecting liquid nitrogen into it. Most of the helicopters were severely irradiated and abandoned in a giant junkyard,[20] the so-called "machines cemetery" near Chernobyl, with several disappearing from the site in later years. During the initial operation, one crashed near the power plant after hitting a construction crane cable with all the crew of four being killed in the crash.[21] [22] It is now known that virtually none of the neutron absorbers reached the core.[23]
On 16 August 2013, the Ministry of Defense of Ukraine reported that one of its Mi-8MSB had set a world altitude record of 9150m (30,020feet) at the Kirovske military airfield on 15 August.[24]
The Ukrainian Armed Forces used Mi-8MSB along with Mi-24s in operations against separatists in Eastern Ukraine during the Russo-Ukrainian War. On 29 May 2014, a Ukrainian National Guard Mi-8 was brought down by Russian separatist forces in Donbas using a MANPADS near Slavyansk with 12 personnel, including an Army general, killed and one seriously injured.[25] On 24 June 2014, a Ukrainian National Guard Mi-8 was shot down by separatist forces again using a MANPADS near Slavyansk with nine personnel killed.[26] Ukrainian forces used Mi-8 helicopters to resupply forces during the Siege of Mariupol at Azovstal iron and steel works and bring in additional reinforcements for the Azov Regiment. Some 16 Mi-8s were used a number of times, two of which were shot down.[27] Russia claimed on 5 April that it shot down two Ukrainian Mi-8s that it said were being used to evacuate commanders of the Azov Regiment.[28] In late August 2023, it was reported that a Russian defector named Maksym Kuzminov[29] handed over a Mi-8AMTSh to the Ukrainian forces in coordination with Ukrainian Intelligence agents.[30]
On 16 October 2023, Ukrainian Colonel General Oleksandr Syrskyi said that the 25th Separate Airborne Brigade had shot down a Mi-8 without supplying the location. According to the Oryx database 21 Mi-8 helicopters have been shot down by Ukraine thus far during the war.[31]
On 31 July 2024, a Russian Mi-8 helicopter was shot down by over occupied Donetsk, by Ukrainian FPV drones. The first time a helicopter in combat was destroyed by a drone. The Mi-8 was believed to have been attacked on the ground either during landing or take off.[32] [33]
During the initial stages of Operation Enduring Freedom, Mi-17s and Mi-8s were extensively used by the CIA and US Special Forces to assist the Northern Alliance in their fight against the Taliban.[34]
A number of Mi-8s and Mi-17s are used by US government agencies as of 2022.[35]
The Yugoslav Air Force took delivery of 24 Mi-8T (Hip C) transport helicopters between May 1968 and May 1969 to equip two squadrons of the newly formed 119th transport regiment from Niš military airport, each squadron with 12 helicopters. Subsequently, from 1973 to the early 1980s, Yugoslavia purchased more Mi-8T helicopters to re-equip two squadrons of 111th regiment from Pleso military airport near Zagreb and the 790th squadron from Divulje military airport near Split, which was under the command of the Yugoslav Navy. In total, the Yugoslav Air Force received 92 Mi-8Ts, designated by the Yugoslav People's Army as the HT-40, while local modification of several helicopters into electronic warfare variants produced the HT-40E. Some 40 helicopters were equipped for firefighting operations.
The Yugoslav Mi-8s' first combat operations were transport of Yugoslav People's Army troops and federal police forces to border crossings in Slovenia on 27 June 1991 during the Ten-Day War. The members of Slovenian Territorial Defence fired Strela 2 MANPAD, and shot one helicopter down, killing all crew and passengers.
During combat in the winter of 1991 in the Croatian war and in the spring of 1992 in the Bosnian War, the Yugoslav People's Army used the Mi-8 fleet for the evacuation of injured personnel, transport of cargo and search and rescue for the crews of aircraft forced down. As most flights were made behind the front, the Croatian forces were able to down just one helicopter, which was hit by small arms fire near Slavonski Brod on 4 October 1991.
After Bosnian Serbs declared their state in the spring of 1992, some former Yugoslav Air Force Mi-8s continued service with the Republika Srpska armed forces. The inventory of the 82nd mixed helicopter squadron, of the 92nd aviation brigade of the Army of Republika Srpska comprised 12 Mi-8T helicopters, which continued in service until Operation Koridor. During that period, the Republika Srpska Air Force lost three Mi-8 helicopters to enemy fire. Three helicopters painted in a blue and white colour scheme flew in the first part of 56th helicopter squadron of the Krajina Milicija, using Udbina military airport in Lika as their main base. The Republika Srpska Air Force continued to operate nine helicopters, albeit suffering problems with maintenance and spare parts, until it was formally disbanded in 2006.
On the other side, Mi-8 helicopters were also used as main air transport. The Croatian National Guard obtained its first on 23 September 1991, near Petrinja, when a Yugoslav Air Force Mi-8 made an emergency landing after being damaged by small-arms fire. A further 6 Mi-8T and 18 Mi-8MTV-1 helicopters were bought from ex-Warsaw Pact countries during the war, with 16 being used in active service, and remaining were used as source for spare parts. The remaining Mi-8Ts were retired from service in the Croatian Air Force after the war, while the Mi-8MTVs continued their service in 20th Transport Helicopter Squadron and 28th Transport Helicopter Squadron. The latter has been re-equipped with new Mi-171Sh helicopters bought from Russia.
The Army of the Republic of Bosnia and Herzegovina secretly obtained Mi-8T, Mi-8MTV and Mi-17 helicopters from various sources. Two helicopters were shot down by Serb air defenses, one around Žepa, while one Mi-17 was shot down by 2K12 Kub M, killing the Bosnian Foreign Affairs Minister Irfan Ljubijankić, a few other politicians, and the helicopter's Ukrainian crew. A few Croatian Mi-8MTVs secretly supported Croatian Defence Council operations in Herceg Bosna. After the war, the Army of the Federation of Bosnia and Herzegovina operated the remaining five Mi-8MTVs and one Mi-8T in the Air Force and Air Defense Brigade of Armed Forces of Bosnia and Herzegovina.
The Macedonian Air Force bought two Mi-8MT helicopters in 2001 from Ukraine. They fly in the Transport Helicopter Squadron (ex 301. Transport Helicopter Squadron). One crashed, killing all 8 passengers and 3 crew members in an accident in January 2008.
During the Kosovo War of 1998 and 1999, the Federal Yugoslav Air Force used Mi-8s for transport of personnel and material to forces in otherwise-inaccessible mountain areas. Evacuation of injured personnel also occurred during the 1999 NATO bombing of Yugoslavia, flying at low altitude to avoid detection by NATO aircraft. In 1999, Yugoslav Mi-8s shot down at least one US Army Hunter UAV with the door gunner's 7.62 mm machine gun.[36] [37] Two Mi-17V helicopters secretly operated by the Special Operations Unit post-1997 were also active during the Kosovar conflict. After the unit disbanded in 2003, the helicopters were transferred to Serbia and Montenegro's air force.
As of mid-2020, the Serbian Air Force, the successor of the Federal Yugoslav Air Force, operates a small amount of Mi-8T which are now being replaced by Mi-17 helicopters. There are 13 Mi-17 in the Serbian air force currently. They are in the 138th Mixed-Transport-Aviation Squadron of 204th Air Base and 119th Combined-Arms Helicopter Squadron (ex 199th regiment) of 98th Air Base.
See main article: List of Mil Mi-8/17 operators.
Afghanistan[48] [49]
Albania[50]
Algeria[48]
Angola[48]
Argentina[48]
Armenia[48]
Azerbaijan[48]
Belarus[48]
Bhutan[48]
Bosnia and Herzegovina[48]
Bulgaria[48]
Burkina Faso[48]
Cambodia[48]
Canada (leased from SkyLink Aviation)[51]
China[48]
Colombia[48]
Croatia[48]
Cuba[48]
Czech Republic[48]
Djibouti[48]
Egypt[48]
Eritrea[48]
Ethiopia[48]
Georgia[48]
Germany[52]
Guinea[48]
Guinea-Bissau[53]
Kazakhstan[48]
Kyrgyzstan[48]
Libya[48]
Lithuania[48]
Maldives[48]
Mexico[48]
Mali[48]
Mongolia[48]
Mozambique[48]
Nepal[48]
Pakistan[48]
Peru[48]
Poland[48]
Romania[55]
Serbia[48]
Slovakia[48]
Somalia
Sudan[48]
Turkey[58]
Turkmenistan[48]
Tajikistan[48]
Ukraine[48]
Uzbekistan[48]
Indonesia
Iraq
Bangladesh
Guyana
Latvia