6 Military Aircraft That Were So Large We Wonder How They Ever Managed to Leave the Runway

In lists about remarkable machinery, military hardware often commands more attention than its civilian counterparts, due to the heightened standards and stringent requirements it must meet. In this list, we delve into some of the largest and most formidable military aircraft ever constructed, ranging from the 1940s to today's colossal creations.

Convair B-36 Peacemaker

The Consolidated B-36 Peacemaker was an immense aircraft holding an array of records. It still has the titles for being the largest mass-produced piston-engine aircraft in history, and it boasted the longest wingspan of any combat aircraft at a whopping 230 feet. Additionally, it holds the distinction of being the first truly intercontinental bomber and the first with the capability to carry nuclear weapons without any modifications.

To keep this 200-ton behemoth aloft, it relied on six Pratt & Whitney 28-cylinder radial engines, each producing about 3,800 horsepower . These were supplemented by an additional four General Electric turbojet engines.

Despite its remarkable specifications, the B-36 had a somewhat underwhelming career, serving with the US Air Force from 1949-59 .

MD-160 ('Caspian Sea Monster')

The MD-160 , famously called the Caspian Sea Monster, held the title of being the largest and heaviest aircraft from 1966 to 1988. This experimental Soviet aircraft-ship hybrid utilized ground effect to efficiently transport equipment and cargo. Weighing a massive 1.2 million pounds, it was capable of cruising at speeds up to 342 MPH while flying just one to five meters above sea level.

The ekranoplan combined the cargo capacity of a ship with the speed of an aircraft. Its unexpected discovery in US spy imagery puzzled American intelligence. By the time officials comprehended its true purpose, it had already been decommissioned, remaining unused until 2020.

Antonov AN-225 Mriya

No list about incredibly large aircraft is complete without the Antonov An-225 Mriya . This absolute marvel of Soviet engineering is the largest and heaviest aircraft ever built, with a maximum takeoff weight of 700 tons and the capacity to carry approximately 250 tons of cargo - its cargo hold is so large that the first flight of the Wright brothers could have been performed entirely inside it.

The An-225 was developed as part of the Space Race and featured an impressive six Progress D-18T turbofan engines, which allowed it to transport the Buran space shuttle on its back. Two were ordered, but only a single unit was delivered. The Soviet Union's collapse put an end to the Buran space program, meaning work on the second An-225 was halted.

The sole An-225 was placed in storage, where it remained for many years. However, the aircraft was destroyed during the Battle of Antonov Airport in February 2022, following the Russian invasion of Ukraine .

Blohm & Voss BV 238

The Blohm & Voss' BV 238 was Germany's attempt at building a giant flying boat . It was the largest the country made during the Second World War and was the heaviest aircraft in the world at the time it was built.

This 43.35-meter-long aircraft had a gross weight of between 198,416 and 209,000 pounds, depending on the mission type, and it was powered by six Daimler-Benz DB603G inverted V-12 liquid-cooled piston engines. One prototype was built, but it was strafed and sunk while moored at Lake Schaal, Germany.

North American XB-70 Valkyrie

The XB-70 is one of the most remarkable aircraft projects that never fully materialized. Developed by North American Aviation in the 1950s and first flown in '64, it was a prototype for the planned B-70 nuclear bomber. It was able to reach speeds of up to 2,056 MPH and cruise at altitudes exceeding 77,000 feet - too fast and high for any interceptor of its time.

Initially, these capabilities rendered the XB-70 practically  invulnerable to interception, but the advent of surface-to-air missiles significantly diminished its defensive advantage. Furthermore, the rise of intercontinental ballistic missiles ultimately led to the cancellation of the project.

Two prototypes were constructed, primarily used for testing high-speed flight. One was lost in a collision with a Lockheed F-104N Starfighter in 1966. The remaining XB-70 was preserved and is on display at the National Museum of the United States Air Force .

Hughes H-4 Hercules ('Spruce Goose')

This huge flying boat was one of American billionaire Howard Hughes' creations. The H-4 Hercules was made mostly from wood, earning it the moniker, "Spruce Goose." It was designed as a cargo aircraft that could fly over the Atlantic during the Second World War, but its delayed development meant it wasn't finished until 1947. The largest aircraft ever built at the time, it featured an over 320-foot wingspan and, overall, was 219 feet long.

Hughes had used government funding to develop the H-4 and was called to testify in front of a committee in 1947. To prove the funds weren't wasted, he made a single one-mile-long flight, at a height of about 70 feet. After touching back down, he kept the aircraft in a climate-controlled hangar, where it was maintained by a secret team for the next 30 years.

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It only ever flew once.