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Mi-4
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Mi-4

Mi-4. A photo. Characteristics. History.

 

Mi-4 presents him the helicopter, which can be used in many fields of human activity. This Soviet helicopter was designed and manufactured in Mil Design Bureau in 50-ies of the last century. His main task was to make transportation for Soviet troops. This machine had all the characteristics to transport goods. Firstly, it had a sufficiently large cargo bay, where you can carry cargo weighing more than 1,5 tones or carry up to 12 paratroopers with full equipment. In this model, the cargo hatch in the tail of the helicopter was first created. This machine has a main machine 20 years landing. Today, this model is still on China's arms.

History of the design and creation of Mi-4

The first developments were made in the early autumn of the year 1951. The main task before the designers Mil was to create a machine that would not be inferior in quality and characteristics of the foreign analogues helicopters. The main point of support from the designers has become an American helicopter H-19. Frankly, Mi-4 looks very similar to this machine. But the main difference of these machines was that the Soviet version was much larger dimensions and weight.

E-4 photo

It should be noted that the development and manufacturing of the prototype model of the Mi-4 have occurred in a very short line. 52 summer has already begun the first tests of the car. The first full flight of Mi-4 1952 made in June of the year. In the same year began full-scale manufacturing in the city of Saratov, on the issue of 53 years and engaged in Kazan plant. Kazan Helicopter Plant has become a major manufacturer Mi-4 1966 until the year in which this machine was removed from production. Operation of the helicopter in the Air Force began in 1953 year. In the same period, the helicopter began to use for civilian purposes, it was mainly the carriage of passengers and goods.

E-4 scheme

This helicopter model had great authority in the military sphere and in civil aviation before the newer model of the Mi-8. This machine is used in virtually all areas of the economy, ranging from the transportation of passengers and to extinguish forest fires and polar expeditions. Mi-4 exported more than 30 countries around the world. This multi-purpose helicopter also manufacture in China. According to statistics in 1955 year on the set of countries armed with 555 units Mi-4. Its operation was to end 80-ies, she finally stopped in 1988, after the collapse of one of the machines.

Design and testing issues

Chief designer of the Mi-4 was appointed MN Brewers. In the development and testing of the Mi-4 designers are faced with many problems, which previously did not arise in the design of previous models. Mil had to resort to the help of TsAGI and FRI, who helped solve the problem of metal fatigue and structural strength. Tasks created a tail rotor, as well as the response of the whole structure in the ground state. But the most difficult issue was the new propeller blades that can withstand only up to 150 hours of operation. But in the future, and it was decided. The life of the blades was brought to three hundred hours, and then completely up to a thousand.

E-4 2 photo

Designers of the geometric dimensions of the screws have been increased, which again led to a new problem: there was a flutter of blades. The decision was to install the beams, but, unfortunately, it does not fully remove this problem. The whole experience, which got constructors in the manufacture of the Mi-4, served them in the future is very good lesson and made to think through all the possible problems in the new models. How to say the workers themselves Mil Design Bureau, Mi-4 helicopter was quite interesting machine.

Characteristics of the Mi-4

Mi-4 was made in a two-story version, which is very similar to American counterpart Sikorski called S-55. Since the new helicopter has a mass that exceeds the Mi-1 4 weight in time, he had to have a sufficiently powerful propulsion. This aircraft was powered by DB-82V, which gave the power take-off in 1700 horsepower, and in normal flight, it reached 1530 horsepower.

Behind the cargo compartment, which is equipped with seats for the Marines was located power plant. The cargo compartment ended hatch, through which you could quite comfortably to boot. For easier lifting and transport Mi-4 cargo was equipped with external load, which is able to withstand the weight of 1300 kg. In the military version of the helicopter it was installed machine gun, which was placed under the fuselage of the machine. Machine guns ran mechanic.

E-4 3434 photo

the cockpit was located above the cargo space, and most of it made up of glass surface. Behind the pilots it was located bay, where is located the fuel tank and the gearbox. To the flight range was longer, the car can be equipped with an additional fuel tank, which is placed inside the cargo compartment.

Lifting the machine carried chetyrehlopastnym main screw which had a diameter of 21 meter. All units are carrying and tail rotor were significantly improved compared with the Mi-1. Hinges helicopters were fitted with rubber grommets to protect. The blades were made of steel spars, which are fastened with rivets. Also, they are joined by a wooden frame. Push the tail rotor consists of three blades that are made from wood, in diameter was 3,6 meters. Most moving joints and cockpit were equipped with anti-icing system.

E-4 photo bw

Mi-4 became one of the first aerial vehicles that were equipped with steering. control wiring are themselves a system of rods and rockers. Office inside the cockpit was fully duplicated, and fairly new at the time the equipment made it possible to carry out missions at any time of the day and even during adverse weather conditions. Chassis Mi-4 consisted of four pyramidal towers, and at the end of 50-ies started to apply and ski landing gear for winter conditions.

Operation of helicopter Mi-4

Helicopter of the model used is much wider than the Mi-1. This is because it was more spacious and practical, in the cargo can be transported 8 injured people on stretchers or 16 paratroopers. But it was comfortable and the fact that it can be transported more whole loads, for example, such as GAZ and two motorcycles with sidecars. Pre redeveloping small can be used as a rescue vehicle for the carriage of injured or sick persons cargo cabin helicopter.

Total production and operation of Mi-4 was a lot of modifications, upgrades and improvements. On the basis of the standard troop transport helicopter has been designed and manufactured for more than thirty different modifications that have more specialized applications.

E-4 photo north

Mi-4 (NATO code: Hound - «The Hound") - Soviet multipurpose helicopter developed by the OKB Mil in the early 1950-x.

The first military transport helicopter of the armed forces of the USSR. I had a similar arrangement as in US Sikorsky S55, but superior in terms of its load capacity is greater than twice. Cargo spacious cabin puts 1600kg cargo or 12 fully-equipped paratroopers. Mi4 - the first Soviet helicopter fitted in the rear cargo hatch with a ladder and dipping flaps.

 

Mi-4 photo.

Mi-4 photo.

In 1950-1970 - the main troop-helicopter Warsaw Pact countries.
HarbinZ5, licensed Chinese copy Mi4, is still in service with the Air Forces of the DPRK.

operators:

  • Military

  • Afghanistan

  • the USSR

  • Algeria

  • Albania

  • Bangladesh

  • Angola

  • Burkina Faso

  • Bulgaria

  • Cameroon

  • Cambodia

  • Cuba

  • China

  • GDR

  • Czechoslovakia

  • Finland

  • Egypt

  • Ghana

  • Guinea-Bissau

  • India

  • Hungary

  • Iraq

  • Indonesia

  • Mali

  • Laos

  • North Korea

  • Mongolia

  • Romania

  • Poland

  • Somalia

  • Sierra Leone

  • Syria

  • PDR Yemen

  • Vietnam

  • Sudan

  • Yugoslavia

  • Yemen

  • civil

  • China

  • Romania

  • Czechoslovakia

  • Mongolia

 

Mi-4 photo. 2

Mi-4 photo.

 

Characteristics of the Mi-4:

  • Crew: 3

  • The greatest number of passengers: 16

  • The diameter of the rotor: 21m

  • The diameter of the tail rotor: 3,6m

  • Fuselage length: 16,8m

  • Height: 4,4m

  • Empty weight: 4900kg

  • Normal takeoff weight: 6950kg

  • The highest take-off weight: 7600kg

  • Maximum Capacity: 1600kg

  • Internal fuel capacity: 1000 + 500kg

  • Engine: 1hASh82V

  • Power: 1h1700l.s.

  • The speed at FL: 140km / h

  • Maximum speed: 226km / h

  • Range of flight practical: 46 km

  • Static ceiling: 1200m

  • Dynamic ceiling: 5500m

 

Mi-4. Gallery.

Mi-4 in the air show a side viewMi-4 at air showMi-4 military flight

Mi-4 with passengersMi-4 prepares for flightMi-4 exhibition

Mi-4 in flight side viewMi-4 on the ground before the flightMi-4 Aeroflot

Mi-4 in aviagarazhe AeroflotMi-4 in flightMi-4 front view

 

 

 

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Comments

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I noticed at the end of one mistake, "flight distance 46 km." In practice it depends on the amount of gasoline; It may be more 1000 km.
Interesting, but not a complete collection of information on this helicopter.

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