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Sukhoi Su-32/37/47 Berkut (Golden Eagle)

Technology Demonstrator Aircraft

Sukhoi Su-32/37/47 Berkut (Golden Eagle)

Technology Demonstrator Aircraft

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
MEDIA
OVERVIEW



The Sukhoi Su-47 Berkut has served well in the technology demonstrator role with some research being incorporated into the Fifth Generation Sukhoi T-50 PAK FA fighter.
National Flag Graphic
ORIGIN: Russia
YEAR: 1997
STATUS: Retired, Out-of-Service
MANUFACTURER(S): Sukhoi OKB - Russia / Soviet Union
PRODUCTION: 4
OPERATORS: Russia; Soviet Union
SPECIFICATIONS



Unless otherwise noted the presented statistics below pertain to the Sukhoi Su-47 Berkut (Golden Eagle) model. Common measurements, and their respective conversions, are shown when possible.
CREW: 1
LENGTH: 74.15 feet (22.6 meters)
WIDTH: 49.74 feet (15.16 meters)
HEIGHT: 20.67 feet (6.3 meters)
WEIGHT (EMPTY): 36,101 pounds (16,375 kilograms)
WEIGHT (MTOW): 77,162 pounds (35,000 kilograms)
ENGINE: 2 x Aviadvigatel D-30F6 thrust-vectoring digitally-controlled afterburning turbojet engines developing 32,000 lb thrust each with afterburner.
SPEED (MAX): 1,684 miles-per-hour (2710 kilometers-per-hour; 1,463 knots)
RANGE: 2,051 miles (3,300 kilometers; 1,782 nautical miles)
CEILING: 59,055 feet (18,000 meters; 11.18 miles)
RATE-OF-CLIMB: 764 feet-per-minute (233 meters-per-minute)




ARMAMENT



None. This was a technology demonstrator. Production-quality models may have featured an internal 30mm cannon and underwing/underfuselage hardpoints for munitions and fuel stores.
VARIANTS



Series Model Variants
• Su-32 "Berkut" - Initial Product Designation; circa 1996.
• Su-37 - Revised Product Designation
• Su-47 - Final Product Designation as of 2002


HISTORY



Detailing the development and operational history of the Sukhoi Su-32/37/47 Berkut (Golden Eagle) Technology Demonstrator Aircraft.  Entry last updated on 11/2/2017. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
While the collapse of the Soviet Empire in 1991 stymied many-a-program in Russia, the Sukhoi concern proceeded with their Su-37/47 "Berkut" ("Golden Eagle") technology demonstrator. The aircraft borrowed much from the other Sukhoi product - the Su-27 "Flanker" - with the exception of its main wing assemblies which were cranked forward in an attempt to research agility at subsonic speeds, post-stall maneuverability, use of strong-yet-lightweight composites and advanced fly-by-wire systems in a modern-day, turbofan-powered airframe. Four working prototypes were eventually completed though no formal adoption was made by the Russian Air Force, leaving the Su-47 to the pages of aviation history. However, the data collected from the various Berkut test flights were used in development of the Su-35 (an advanced Su-27 model line) as well as Russia's first 5th Generation Fighter - the PAK-FA "T-50" - this development intended to compete with the American Lockheed F-22 "Raptor".

The use of forward-swept wing assemblies offers some inherent advantages to conventional, rear-swept appendages seen in nearly all jet-powered aircraft today. With such a configuration, the aircraft is capable of excellent maneuverability at subsonic speeds, reduced take-off and landing rolls, a reduced radar signature and increased control during high angles of attack. The primary detriment of the configuration remains the stress loads placed upon each wing, forcing them to twist and bend in an unnatural fashion, which can lead to midair disasters in the right circumstances. In the Su-37/47 design, the wings are purposely constructed of twisting/bending composites to alleviate such stresses.

During World War 2, German engineers were able to successfully launch the jet-powered Junkers Ju 287 as a multi-engined bomber. This design was powered by 4 x Junkers Jumo 004 turbojets with two paired engines slung under each wing. The wings themselves were high-mounted and cranked forward along the fuselage sides. One working prototype was eventually completed and followed by two unfinished airframes before the end of the war. The examples were captured by advancing Soviet forces during the last weeks of the war and appropriately dissected by Soviet engineers. The concept of a forward-swept wing fighter was also entertained by the Americans during the Cold War years, embodied through the Grumman X-29 technology demonstrator. This aircraft first flew on December 14th, 1984 and utilized the fuselage of the Northrop F-5A "Freedom Fighter", two of which were converted into X-29 prototype form. Like the Berkut, the X-29 program reached its project end and was never adopted by the US military.

The Berkut herself was born during the waning years of the Soviet Empire when, in 1983, the Soviet Air Force began funding the forward-swept wing program with Sukhoi. The product was originally born as the S-32 before graduating to become the Su-37 and, finally, the Su-47. The program was first leaked in 1996 and understood by the West to be the acting prototype for a Russian 5th Generation Fighter - perhaps intended to match with the American F-22 which was also in development at the time. First flight of the S-32 was recorded on September 25th, 1997 and its first public display was noted at Zhukovsky in August of 1999. The aircraft achieved supersonic flight in August of 2000 and by this time it was understood that the S-32/Su-37 design was, in fact, only a true technology demonstrator and not a direct prototype to something forthcoming. The Su-37 was redesignated to Su-47 in 2002.




Sukhoi Su-32/37/47 Berkut (Golden Eagle) (Cont'd)

Technology Demonstrator Aircraft

Sukhoi Su-32/37/47 Berkut (Golden Eagle) (Cont'd)

Technology Demonstrator Aircraft



However, the fall of the Soviet Empire jeopardized development of the S-32/37/47 for the reborn Russian Ministry of Defense lacked the funding required to keep many programs afloat. Sukhoi continued the Berkut as a private venture, helped along by its many Su-27 sales, in the hopes the Berkut could further internal knowledge of forward-swept flight for possible integration into a future Sukhoi fighter design. The aircraft continued to progress, though at a much slower pace, and testing eventually proved the design sound. The forward-swept nature of the wings allowed for the expected improvement in agility at low speeds with enhanced maneuverability. The demonstrator netted a maximum speed of Mach 1.6 during testing.

Outwardly, and beyond the obviously forward-swept wings, the Su-37/47 remained a largely conventional aircraft design. The cockpit (taken from the Su-27) was set at the front of the fuselage and aft of a short nose cone assembly. The engines were paired at the rear in a side-by-side arrangement, set between the twin, outward-canted vertical tail fins. While the inlets of the aircraft were fixed, air scoops were embedded into the leading edge of each wing to provide additional airflow to the engines during low-speed flight. Ahead of the main wings were small forward canards to increase controllability and lift. Aft of the main wings were shallow horizontal planes. The undercarriage was fully retractable and of a tricycle arrangement, borrowed from the Su-27K model to expedite development.

The Su-32/37/47 demonstrator was outfitted with 2 x Aviadvigatel D-30F6 turbofan engines capable of afterburn (the same as fitted to the Mikoyan MiG-31 "Foxhound" interceptor). Output was listed at 18,700lbs under "dry" thrust with 32,000lbs of thrust generated through afterburning (raw fuel pumped into the exhaust for limited bursts of thrust). Advanced demonstrators were to field 2 x Lyulka brand AL-37FU/FP turbofans with thrust-vectoring. The Berkut achieved a maximum speed of 1,066 miles per hour with a cruising speed of 870 miles per hour. Range was listed at 2,050 miles with a service ceiling of 59,000 feet and rate-of-climb of 46,200 feet-per-minute.

In comparison, the Su-27SK model (and export-minded single-seater) yielded a maximum speed of 1,550 miles per hour with a rnage out to 2,070 miles. Its service ceiling was 62,500 feet with a rate-of-climb nearing 54,000 feet per minute.

Intended from the beginning as a technology demonstrator, the Su-37/47 was not officially armed. Had it reached the formal adoption stage, it may have included an internal 30mm cannon as well as various underwing and underfuselage hardpoints for the carrying of guided/unguided, powered/unpowered munitions similar in scope to the rest of the Flanker family.

As it stands, the Su-47 existed only through the four aforementioned prototypes and it is believed that all active development on the series have been stopped.




MEDIA









Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

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Relative Maximum Speed Rating
Hi: 1700mph
Lo: 850mph
    This entry's maximum listed speed (1,684mph).

    Graph average of 1275 miles-per-hour.
City-to-City Ranges
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Graph showcases the Sukhoi Su-47 Berkut (Golden Eagle)'s operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
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Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
4
4

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


Altitude Visualization
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Supported Roles
A2A
Interception
UAV
Ground Attack
CAS
Training
ASW
Anti-Ship
AEW
MEDEVAC
EW
Maritime/Navy
SAR
Aerial Tanker
Utility/Transport
VIP
Passenger
Business
Recon
SPECOPS
X-Plane/Development
A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue
Commitments / Honors
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.