The Antonov An-22, the Largest Turboprop in the World

When the name “Antonov” is mentioned, many immediately think of the An-225, which was once the world’s largest aircraft until its destruction during the Ukraine-Russian war. However, Antonov’s achievements in aviation extend beyond the An-225. They are also credited with creating the world’s largest turboprop, the An-22. Indeed, the Antonov An-22 surpasses the Airbus A400M, the Tu-114, and even the Tu-95 Bear bomber in size.

The Antonov An-22, a heavy transport aircraft from the Cold War era, holds the title of the world’s largest turboprop aircraft. Nicknamed after the mythical giant Antaeus, this plane has a storied history of humanitarian missions and military deployments.

Born in the late 1950s out of the Soviet Union’s need for a heavy transport aircraft, the An-22 was designed with a singular purpose: to bolster the capabilities of the Airborne Forces. Unlike its predecessors, the An-12 and An-8, the An-22 could carry a significant number of armored vehicles – a game-changer for airborne troop deployments. Its immense cargo hold, stretching a staggering 57.92 meters (190 ft) in length and offering a usable volume of 345 square meters (3,710 sq ft), allowed it to carry a substantial number of armored vehicles, revolutionizing airborne troop deployments. With a maximum payload capacity of 80,000 kilograms (176,370 lbs), the An-22 could deliver critical supplies and equipment to remote regions.

The An-22’s design prioritized operation from rough, unpaved airstrips, making it perfect for airlifting troops and equipment into regions with limited infrastructure. This feat was achieved through a combination of factors. The four pairs of contra-rotating propellers, each powered by a Kuznetsov NK-12MA turboprop engine generating 15,000 shaft horsepower, produced a powerful downwash over the wings and flaps. This enhanced low-speed performance, allowing for shorter takeoffs and landings on uneven surfaces. Additionally, the An-22 sported a ruggedized landing gear specifically designed to handle the harshest terrains.

The An-22’s spacious cargo hold also saw use in civilian applications. Early in its service history, it delivered Soviet aid to Peru following a devastating earthquake. A proposed civilian variant envisioned seating a staggering 724 passengers, a concept that never came to fruition but highlights the immense potential of the An-22’s design.

Design of the An-22

While visually similar to its smaller cousin, the Antonov An-12, the An-22 sported a distinctive twin tail. This design not only improved performance with one engine out, but also allowed for greater hangar clearance. Interestingly, early prototypes even featured a fully glazed nose, a feature absent from production models that opted for a nose-mounted radar.

Despite its impressive capabilities, the Antonov An-22’s reign wasn’t without challenges. Only one production variant, the standard An-22, ever saw widespread use. The proposed civil airliner version remained a blueprint. Furthermore, with the arrival of the even larger and more powerful Antonov An-124 in the late 1980s, the An-22 gradually transitioned to a secondary role.

The Antonov An-22’s legacy, however, remains undeniable. It witnessed numerous historical events, from delivering Soviet military aid during the Yom Kippur War to transporting helicopters for Ethiopian drought relief efforts. It played a crucial role in the aftermath of the Chernobyl disaster. More recently, it saw service during the Bosnian War.

Today, the An-22’s presence in the skies is dwindling. The Russian Air Force maintains a handful for specialized tasks, with their retirement planned for sometime around 2033. A single civilian An-22 still exists, though its future remains uncertain.