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Mil Mi-4 Hound

Mil · Utility/Transport · USSR · Early Jet (1946–1969)

The Mil Mi-4 (NATO reporting name Hound) was a Soviet single-engine medium transport helicopter — Mikhail Mil's response to the American Sikorsky H-19 + the Soviet Union's first widely-deployed medium helicopter. Mikhail Mil designed the Mi-4 in 1951-1952; first flight 3 June 1952. About 4,000 Mi-4s + Chinese Harbin Z-5 licence variants were built between 1952 and 1979. The aircraft served Soviet Air Forces + Aeroflot + 30+ export operators 1953-1990s.

The Mi-4 used a Shvetsov ASh-82V 14-cylinder radial piston engine (1,700 hp). Maximum speed 185 km/h, range 590 km, service ceiling 5,500 m. Capacity: 12 passengers / paratroops + 2 crew, or 1,600 kg cargo + clamshell rear cargo doors for vehicle loading. The aircraft was rapidly developed in 1952 — taking only ~10 months from design start to first flight — after Stalin personally ordered a Soviet equivalent to the American H-19s being used in the Korean War.

Mi-4 service was extensive. Soviet Air Forces operated ~2,000 Mi-4s 1953-1980s in assault + cargo + ASW + ASR roles. Chinese Harbin Z-5 licence (~1,000 built 1958-1980) was the principal People's Liberation Army Air Force helicopter through the 1970s. ~30 export operators included Warsaw Pact + Egypt + Iraq + Cuba + India + Indonesia + others. About 10 Mi-4 airframes survive in 2026.

For Kids — a shorter, friendlier version

The Mil Mi-4 was a Soviet medium-size helicopter from the 1950s. It was Mikhail Mil's answer to the American Sikorsky H-19 used during the Korean War. Stalin himself ordered Soviet engineers to build something like the H-19, and they did it in only about 10 months.

The Mi-4 first flew in June 1952. About 4,000 Mi-4s were built in the Soviet Union and China between 1952 and 1979. The aircraft served the Soviet military, Aeroflot, and more than 30 other countries.

The helicopter used one big piston engine with 1,700 horsepower. It could carry 12 soldiers or paratroopers, plus two crew. The Mi-4 had clamshell doors at the back that opened wide enough to drive a small car or truck inside. It is about as long as a city bus.

The Mi-4 was used for many tasks — troop transport, search and rescue, supply drops, and even crop spraying. China built a copy of the helicopter called the Harbin Z-5. The Mi-4 was finally retired in the 1990s after almost 40 years of service.

Fun Facts

Stalin himself ordered Soviet engineers to build the Mi-4.
The first Mi-4 flew only about 10 months after Stalin gave the order.
About 4,000 Mi-4s were built in the Soviet Union and China.
The helicopter can carry 12 paratroopers or a small truck inside.
China copied the Mi-4 and built its own version called the Harbin Z-5.
The Mi-4 used clamshell doors at the rear for easy loading.

Kids’ Questions

Why did Stalin want a helicopter like the American H-19?

During the Korean War, the United States used the H-19 helicopter to fly soldiers and supplies to hard-to-reach places. Stalin saw how useful that was and ordered Soviet engineers to build a similar helicopter as fast as possible. The Mi-4 was the result.

How could the Mi-4 fit a small truck inside?

The back of the Mi-4 had big clamshell doors that swung open like a giant cargo hatch. A ramp dropped down so a small Jeep or truck could drive right inside. This made the Mi-4 very useful for moving troops with their gear.

Variants

Mi-4A (transport): Standard transport. About 2,500 built.
Mi-4M (ASW): ASW variant for Soviet Naval Aviation.
Harbin Z-5 (Chinese licence): Chinese variant. ~1,000 built 1958-1980.

Notable Operators

Soviet Air Forces + Aeroflot (1953-1980s): Lead operator. ~2,000 airframes.
PLAAF (via Harbin Z-5): Chinese principal helicopter through the 1970s.
30+ export operators: Warsaw Pact + Egypt + India + Cuba + others.

Frequently Asked Questions

Why was the Mi-4 rushed?

Stalin personal order after Korean War. The American Sikorsky H-19 Chickasaw demonstrated helicopter combat-utility in Korea 1950-1953 — air rescue + light transport + observation roles the Soviet Union had no equivalent for. Stalin personally ordered Mikhail Mil to develop a Soviet equivalent in record time; the Mi-4 went from design start to first flight in ~10 months (1951-1952) + entered Soviet service in 1953.

Sources

Wikipedia — Mil Mi-4