Antonov An-71

Antonov An-71
Državi	Sovjetski
Vlogo	Tactical AWACS
Prvi let	12 July 1985
Zgrajena	3

V Antonov An-71 (NATO reporting name: Madcap) is a Soviet AWACS aircraft intended for use with VVS-FA (Fighter Bomber) forces of the Soviet Air Force, developed from the An-72 transport.

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Antonov An-71 Madcap AWAC Walk Around
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Fotografije	21

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The Madcap: Soviet Eyes in the Sky

V Antonov An-71 (NATO reporting name: “Madcap”) remains one of the most visually striking and mechanically unconventional aircraft of the late Cold War era. Developed by the Soviet Union in the 1980s as a tactical Airborne Early Warning and Control (AEW&C) platform, it was meant to provide radar surveillance and battlefield management for Soviet tactical aviation. Built on the airframe of the An-72 STOL (Short Takeoff and Landing) transport, the An-71 famously mounted its massive radar rotodome forward-swept on top of its vertical stabilizer. Despite highly promising flight tests and advanced tech, the collapse of the Soviet Union brought a sudden end to the program, leaving it a rare aviation relic with only three prototypes ever constructed.

Attribute	Technical Specification (Antonov An-71)
Vlogo	Tactical Airborne Early Warning and Control (AEW&C)
Posadke	6 (Pilot, Co-pilot, and 4 Radar/Mission Systems Operators)
Propulsion	2 × Progress D-436K turbofans (7,500 kgf each) plus 1 × Rybinsk RD-38A booster turbojet (in the tail)
Maximum Speed	650 km/h (404 mph) \| Cruise speed: 530 km/h
Service Ceiling	10,800 m (35,433 ft)
Maximum Takeoff Weight	48,000 kg (105,822 lbs)
Dimensions	Length: 23.5 m (77 ft) \| Wingspan: 31.89 m (104 ft 7 in)
Mission Endurance	4.5 to 5 hours on station
Radar Tracking Capacity	Up to 400 targets simultaneously; detects low-flying objects down to 0-30 meters altitude

Design Engineering: The Tail-Mounted Rotodome and Coandă Effect

The Forward-Swept Tail Rotodome: The defining visual hallmark of the An-71 is its massive radar dome placed on top of the vertical fin. Because the aircraft utilized high-mounted engines, placing the rotodome on the fuselage would cause extreme aerodynamic interference and blind spots from the hot exhaust. Designers solved this by sweeping the giant tail fin forward and anchoring the radar array at the peak to achieve clean, unobstructed 360-degree radar sweeps.
Harnessing the Coandă Effect: Inherited from its transport twin (the An-72), the An-71’s engines were mounted high over the top surface of the wing. This utilized the Coandă Effect—the physical tendency of a fluid jet to stay attached to a convex surface—blowing high-velocity engine exhaust directly over the wing flaps to generate massive extra lift. This allowed the heavy radar plane to operate out of tiny, unpaved runways close to the front lines.
The Hidden Tail Booster Engine: To offset the severe aerodynamic drag of the massive tail-mounted rotodome during critical takeoff and climb phases, Antonov engineers installed a third, hidden engine. A single Rybinsk RD-38A booster turbojet was buried inside the rear fuselage, drawing air from a dorsal intake and exhausting under the tail to provide an emergency kick of thrust when needed.
The Vega Mission Suite: Inside the pressurized cargo hold area sat the “Kvant” radar system, developed by the Vega Radio Engineering Corporation. It was a sophisticated pulse-Doppler radar capable of tracking high-speed targets through intense ground clutter and electronic jamming, directly data-linking real-time threats to supersonic Soviet interceptors like the MiG-29 and Su-27.

Operational History: A Frozen Project of a Vanishing Empire

A Specialized Frontline Scout: The An-71 first took to the skies on July 12, 1985. It was envisioned as a nimble, low-cost, tactical alternative to the massive, expensive Ilyushin A-50 Mainstay. While the A-50 handled strategic defense of the entire USSR, the An-71 was intended to fly directly alongside front-line combat groups, providing air coordination right at the edge of the battlefield.

The Carrier-Borne Rivalry:

During its development phase, the An-71 program collided with a parallel project: the Yakovlev Yak-44. Both planes vied to become the eye-in-the-sky for the Soviet Navy’s emerging class of large aircraft carriers, like the

Ulyanovsk

. Ultimately, the folding-wing, turboprop design of the Yak-44 was favored for the tight constraints of a flight deck, relegating the An-71 purely to land-based frontline operations.

The Shadow of the Soviet Collapse: By the late 1980s, the three prototypes had logged hundreds of successful flight hours, proving the unique tail-radar architecture was highly functional and aerodynamically stable. However, as the Soviet economy splintered in 1990 and collapsed entirely in 1991, funding vanished instantly. The Russian and Ukrainian militaries could no longer afford to finance a specialized tactical radar fleet.
The Museum Survivors: Production was officially canceled before the aircraft could enter active service. Today, of the three prototypes built, one was scrapped, one remains in storage at the Antonov facilities, and the most famous surviving prototype sits proudly on display at the State Aviation Museum in Kyiv, Ukraine, preserving the memory of the ultimate Soviet STOL radar experiment.