When it comes to lists of extreme machinery, military equipment often takes precedence over its civilian counterparts, due to the significantly higher and more rigorous demands placed upon it. In this list, we look at some of the biggest and imposing military aircraft ever manufactured, 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 – better known as the Caspian Sea Monster – was the largest and heaviest aircraft from 1966-88. This experimental Soviet aircraft-ship hybrid utilized ground effect to transport equipment and cargo. Weighing 1.2 million pounds, it could fly one to five meters above sea level and travel up to 342 MPH.
The ekranoplan combined the cargo capacity of a ship with the speed of an aircraft. Its unexpected discovery in US spy images baffled American intelligence. By the time officials understood its true purpose, it had already been retired, 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 probably the most incredible aircraft that never was. North American Aviation developed it during the 1950s and first flew it in ’64. Its was a prototype for the planned B-70 nuclear bomber, capable of flying at 2,056 MPH at over 77,000 feet – too fast and high for any interceptor.
At the time, these capabilities made the XB-70 virtually immune to interception, but the introduction of surface-to-air missiles significantly reduced its invulnerability. On top of this, intercontinental ballistic missiles coming into use essentially ended the project outright.
Two prototypes were built, which were subsequently used to test high-speed flight. It was in this role that one of the prototypes was destroyed when it collided with a Lockheed F-104N Starfighter in 1966. The other was flown to the National Museum of the United States Air Force, where it remains today.
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.