Mil Mi-4

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Mi-4-JH01 (remix).jpg
Mil Mi-4 at Prague Aviation Museum
Role Transport helicopter
Manufacturer Mil Moscow Helicopter Plant
First flight 3 June 1952
Introduction 1953
Status Limited Service; North Korean Air Force
Primary users Soviet Air Force
Polish Air Force
Produced 1951–1979
Number built over 4,000 including Z-5s
Variants Harbin Z-5

The Mil Mi-4 (USAF/DoD reporting name "Type 36",[1] NATO reporting name "Hound")[2] is a Soviet transport helicopter that served in both military and civilian roles.

Design and development[edit]

The Mi-4 was designed in response to the American H-19 Chickasaw and the deployment of U.S. helicopters during the Korean War. While the Mi-4 strongly resembles the H-19 Chickasaw in general layout, including the innovative engine position in front of the cockpit, it is a larger helicopter, able to lift more weight and built in larger numbers. The first model entered service in 1953. The helicopter was first displayed to the outside world in 1952 at the Soviet Aviation Day in Tushino Airfield.

One Mi-4 was built with a jettisonable rotor. It served as an experimental vehicle for future pilots' means of safety and ejection designs.[3]

Operational history[edit]

The Mi-4 transport helicopter laid the beginning of the Soviet Army Aviation. It was widely used both in the armed forces and in Soviet civil aviation, and for several decades remained the main type of helicopter in the inventory of the Soviet Armed Forces and of the Civil Air Fleet. The Mi-4 went out of service with the development of the Mi-8. It is no longer used by the Russian Air Force, though it remained in service in some countries as a utility helicopter or as a military transport a while longer. Albania was thought to be the final country using the helicopter and by 2005 all were out of service. The Mi-4 played a very important role in the Bangladesh liberation war of 1971. The Mi-4 was the workhorse of the Indian Air Force[4] covering the medium lift role at the time. A highly successful heli-borne operation, the Meghna Heli Bridge, using Mi-4s helped the Indian Army's 57 Mountain Division clear the Meghna River. The helilift of a battalion of Indian troops to the outskirts of Sylhet was the first heli-borne operation of the Indian army.

Much like the UH-1 Huey, after it was gradually phased out of military service, it was used in various domestic roles: search and rescue, firefighting, polar expeditioning, construction site cargo helicopter, commercial flights and many others.[3]

An official video of a North Korean Air Force combat flying skills competition released in 2014 shows that the Mi-4 is still in limited service in North Korea.[5]


Prototype. Designation reused for the Mi-12.
Mi-4 (NATO – Hound-A)
Basic production version.
Assault transport helicopter.
Armed versions based on the Mi-4A. V for Vooruzhenniy (Armed). Mi-4A with additional armament. Modification of 1967 had weapons complex K-4V, included four 9М17М ATGM "Phalanga" and 96 57-mm NAR S-5M in six blocks UB-16-57U (or six 100-kg bombs or four 250-kg bombs or tanks with an incendiary substance); 185 helicopters were converted to Mi-4AV.[6]
Factory designation for demilitarised Mi-4 for use in the Civil Air Fleet.
Mi-4L Lyukes
Six-seat VIP transport version, sometimes converted into an air ambulance helicopter.
Fire-fighting version of Mi-4L.
Mi-4M (NATO – Hound-C)
Anti-submarine warfare helicopter with searching radar station SPRS-1 ("Kurs-M"), hydroacoustic station "Baku", additional fuel tank and rescue boat with operator in under-fuselage gun turret.[7][8]
Export modification of Mi-4M.[8]
Slightly modified version of Mi-4M, differed by some avionics system.[9]
Upgraded version of Mi-4VM with the searching radar station "Rubin-V" instead of "Kurs-M".[9]
Mi-4P / Mi-4VP
Civil transport helicopter, with accommodation for between 8 and 11 passengers, plus eight stretchers and a medical attendant for air ambulance duties.
Mi-4PL (NATO – Hound-B)
Anti-submarine warfare helicopter.
SAR version.
Mi-4S Salon
VIP transport helicopter.
Multi-role agricultural helicopter, with a large chemical container in the main cabin. Also used as a fire-fighting helicopter.
Major military production version, equipped with a large diameter main rotor and bulged windows.
Mi-4VM (VM-12)
Anti-submarine warfare helicopter.
Minesweeper with floats.
Mi-4M equipped with the Rion experimental sonar.
Torpedo-carrying ASW attack (killer) aircraft derived from Mi-4M.
Attack helicopter.
Search helicopter with Oka sonar.
Search helicopter with Soora infra-red sensor.
Mi-4FV (Mi-4KV)
Photographic and guidance helicopter.
"Polar version" of Mi-4FV for working at the Soviet Arctic and Antarctic research stations.
Special rescue modification.
Experimental version equipped with an external load sling system.
Mi-4 with improved heat insulation for working in the Far North.
Mi-4N "Filin" (Horned owl)
Experimental reconnaissance version intended for night-time use.
Mi-4KK (Mi-4VKP)
Mobile command post.
Mi-4KU (Mi-4VPU)
Mobile command post for controlling Air Force units.
Target-designator version carrying the Oospekh (Success) system.
Mi-4 fitted with Grebeshok-3 (Haircomb-3) wide-range panoramic detection and relay radar.
TV-equipped artillery reconnaissance and spotting helicopter.
Mi-4MK (Mi-4PP)
ECM version.
Radio-controlled target drone version.
Harbin Z-5
Chinese military transport helicopter. Chinese production version.
Harbin Z-6
Prototype turbine powered version of the Z-5, no production undertaken.
Chinese civil transport helicopter. Chinese production version.
Unnamed Variants
  • Mi-4 minelayer version produced by converting troop-carrier helicopters.
  • Mi-4 modified for transporting and laying gas pipelines.
  • Mi-4 with Panorama 360 cin camera system produced by conversion.
  • Mi-4 with the Pristavka (Add-on) radio equipment developed in 1957 for guidance of remote-controlled reconnaissance balloons.
  • Mi-4s used as testbeds. Apart from the above-mentioned versions, the Mi-4 and Mi-4A were widely used as testbeds of various kinds for testing subassemblies and systems of future aircraft, as well as equipment for other branches of industry.


MI-4 in Riga aviation museum
People's Republic of Bulgaria People's Republic of Bulgaria
 East Germany
Hungarian People's Republic Hungarian People's Republic
 Khmer Republic
Mil Mi-4 of the Finnish Airforce
 North Korea
Polish People's Republic Polish People's Republic
Socialist Republic of Romania Socialist Republic of Romania
 Soviet Union
a Hungarian Mi-4
 North Yemen

Specifications (Mi-4A)[edit]

Mil Mi-4 3-view drawing

Data from

General characteristics

  • Crew: 1 or 2
  • Capacity: 16 troops or up to 1,600 kg (3,527 lb) of cargo
  • Length: 16.8 m (55 ft 1 in)
  • Height: 4.4 m (14 ft 5 in)
  • Empty weight: 5,100 kg (11,244 lb)
  • Gross weight: 7,150 kg (15,763 lb)
  • Max takeoff weight: 7,550 kg (16,645 lb)
  • Powerplant: 1 × Shvetsov ASh-82V 14-cylinder air-cooled radial piston engine, 1,250 kW (1,680 hp)
  • Main rotor diameter: 21 m (68 ft 11 in)
  • Main rotor area: 346.4 m2 (3,729 sq ft)


  • Maximum speed: 185 km/h (115 mph, 100 kn)
  • Range: 500 km (310 mi, 270 nmi)
  • Service ceiling: 5,500 m (18,000 ft)
  • Disk loading: 41 kg/m2 (8.4 lb/sq ft)
  • Power/mass: 0.21 kW/kg (0.13 hp/lb)

See also[edit]

Related development

Aircraft of comparable role, configuration, and era


  1. ^ "Designations of Soviet and Russian Military Aircraft and Missiles". 2008-01-18. Retrieved 2012-10-28.
  2. ^ "Designations of Soviet and Russian Military Aircraft and Missiles". 2008-01-18. Retrieved 2012-10-28.
  3. ^ a b John Pike. "Mi-4 HOUND (MIL)". Retrieved 2012-10-28.
  4. ^ "Indian Air Force Gallery :: Mil Mi-4 - Bharat Rakshak". Bharat Rakshak. Retrieved 2017-11-05.
  5. ^ Archived at Ghostarchive and the Wayback Machine: "朝鲜空军飞行技术大赛 North Korea Air Force combat flying skills contest". YouTube.
  6. ^ "Миль Ми-4". Retrieved 2017-10-19.
  7. ^ "AKL-201707 AviaCollection 2017/7 Mil Mi-4 Hound Military and Civil Transport Helicopter". Retrieved 2017-10-19.
  8. ^ a b "Миль Ми-4М". Retrieved 2017-10-19.
  9. ^ a b "Миль Ми-4М". Retrieved 2017-10-19.
  10. ^ a b c d "Military Helicopter Market 1971 pg. 575". Retrieved 2013-04-03.
  11. ^ "Military Helicopter Market 1981 pg. 321". Retrieved 3 April 2013.
  12. ^ "Military Helicopter Market 1975 pg. 293". Retrieved 3 April 2013.
  13. ^ a b c d e "Military Helicopter Market 1971 pg. 576". Retrieved 2013-04-03.
  14. ^ a b c "Military Helicopter Market 1971 pg. 577". Retrieved 2013-04-03.
  15. ^ a b c Meyer, Manfred. Mi-1 und Mi-4 - die ersten Hubschrauber, "Fliegerrevue" Nr. 9/1999, p.55-59 (in German)
  16. ^ a b c d "Military Helicopter Market 1971 pg. 578". Retrieved 2013-04-03.
  17. ^ "Daffa Athaya's picture". Facebook. Retrieved 2019-02-25.
  18. ^ a b Conboy and Morrison, Shadow War: The CIA's Secret War in Laos (1995), p. 102 (Notes 2, 9).
  19. ^ "Royal Lao Air Force Aircraft Types". Retrieved 19 December 2016.
  20. ^ "Military Helicopter Market 1975 Force Aerienne du Mali". Retrieved 3 April 2013.
  21. ^ "Military Helicopter Market 1971 pg. 579". Retrieved 3 April 2013.
  22. ^ a b "Military Helicopter Market 1975 pg. 304". Retrieved 2013-04-03.
  23. ^ a b c d e "Military Helicopter Market 1971 pg. 580". Retrieved 2013-04-03.
  24. ^ "Military Helicopter Market 1981 pg. 372". Retrieved 3 April 2013.
  25. ^ "Military Helicopter Market 1972 pg. 202". Retrieved 3 April 2013.
  26. ^ "Military Helicopter Market 1981 pg. 374". Retrieved 3 April 2013.
  27. ^ a b c "Military Helicopter Market 1971 pg. 581". Retrieved 2013-04-03.


  • Bill Gunston, An Illustrated Guide to Military Helicopters, Salamander Books Ltd, London 1981. ISBN 978-0861011100
  • Bob Ogden, Aviation Museums and Collections of The Rest of the World, UK: Air-Britain 2008. ISBN 978-0-85130-394-9
  • Kenneth Conboy with James Morrison, Shadow War: The CIA's Secret War in Laos, Boulder CO: Paladin Press, 1995. ISBN 978-1-58160-535-8
  • "Pentagon Over the Islands: The Thirty-Year History of Indonesian Military Aviation". Air Enthusiast Quarterly (2): 154–162. n.d. ISSN 0143-5450.

External links[edit]

The initial version of this article was based on material from It has been released under the GFDL by the copyright holder.