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https://en.wikipedia.org/wiki/Sukhoi_Su-47

The Sukhoi Su-47 Berkut (Russian: ????? ??-47 ??????, lit. 'Golden
Eagle') (NATO reporting name Firkin), also designated S-32 and S-37
(not to be confused with the twin-engined delta canard design offered
by Sukhoi in the early 1990s under the designation Su-37) during
initial development, was an experimental supersonic jet fighter
developed by Sukhoi Aviation Corporation. A distinguishing feature of
the aircraft was its forward-swept wing that gave the aircraft
excellent agility and maneuverability. While serial production of the
type never materialized, the sole aircraft produced served as a
technology demonstrator prototype for a number of advanced
technologies later used in the 4.5 generation fighter SU-35BM and
current fifth-generation jet fighter Sukhoi Su-57.

The Su-47 is of similar dimensions to previous large Sukhoi fighters,
such as the Su-35. To reduce development costs, the Su-47 borrowed the
forward fuselage, vertical tails, and landing gear of the Su-27
family. Nonetheless, the aircraft includes an internal weapons bay,
and space set aside for an advanced radar.

Though similar in overall concept to the Grumman X-29 research
aircraft of the 1980s, the Su-47 is larger and far closer to an actual
combat aircraft than its US counterpart.

Like its immediate predecessor, the Su-37, the Su-47 is of
tandem-triple layout, with canards ahead of wings and tailplanes.
Interestingly, the Su-47 has two tailbooms of unequal length outboard
of the exhaust nozzles. The shorter boom, on the left-hand side,
houses rear-facing radar, while the longer boom houses a brake
parachute.

Role
Experimental/Technology demonstrator

Manufacturer
Sukhoi

First flight
25 September 1997

Status
Cancelled

Primary user
Russian Air Force

Number built
1

Maneuverability

The Su-47 has extremely high agility at subsonic speeds, enabling the
aircraft to alter its angle of attack and its flight path very quickly
while retaining maneuverability in supersonic flight. The Su-47 has a
maximum speed of Mach 1.6 at high altitudes and a 9g capability.

The swept-forward wing, compared to a swept-back wing of the same
area, provides a number of advantages:

* higher lift-to-drag ratio

* better agility in dogfight situations

* higher range at subsonic speed

* improved stall resistance and anti-spin characteristics

* improved stability at high angles of attack

* a lower minimum flight speed

* a shorter take-off and landing distance

The forward-swept midwing gives the Su-47 its unconventional
appearance. A substantial part of the lift generated by the
forward-swept wing occurs at the inner portion of the wingspan. This
inboard lift is not restricted by wingtip stall and the lift-induced
wingtip vortex generation is thus reduced. The ailerons—the wing's
control surfaces—remain effective at the highest angles of attack, and
controllability of the aircraft is retained even in the event of
airflow separating from the remainder of the wings' surface.

A downside of such a forward-swept wing design is that it
geometrically produces wing twisting as it bends under load, resulting
in greater stress on the wing than for a similar straight or aft-swept
wing. This requires the wing be designed to twist as it bends—opposite
to the geometric twisting. This is done by the use of composites wing
skins laid-up to twist. The plane was initially limited to Mach 1.6.


Specifications (Su-47)

General characteristics
Crew: 1
Length: 22.6 m (74 ft 2 in)
Wingspan: 15.16 m to 16.7 m (49 ft 9 in to 54 ft 9 in)
Height: 6.3 m (20 ft 8 in)
Wing area: 61.87 m² (666 sq ft)
Empty weight: 16,375 kg (36,100 lbs)
Loaded weight: 25,000 kg (55,115 lb)
Max. takeoff weight: 35,000 kg (77,162 lb)
Thrust vectoring: ±20° at 30° per second in pitch and yaw
Powerplant: 2 × Aviadvigatel D-30F11 afterburning, thrust vectoring
(in PFU modification) turbofans Dry thrust: 83.4 kN (18,700 lbf) each
Thrust with afterburner: 142.2 kN (32,000 lbf) each

Performance

Maximum speed: Mach 1.65 (Achieved in test flights) (1,717 km/h, 1,066
mph)
At sea level: Mach 1.16 (1,400 km/h, 870 mph)
Range: 3,300 km (2,050 mi)
Service ceiling: 18,000 m (59,050 ft)
Rate of climb: 233 m/s (46,200 ft/min)
Wing loading: 360 kg/m² (79.4 lb/(sq ft))
Thrust/weight: 1.16 (loaded) / 1.77 (empty)




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Just for what it is worth, "Berkut" is
better translated to "Falcon." Makes you
wonder about the NATO name of Firkin.

And no. That didn't come from Google
Translate, though I will now go and check!
It came from a native Russkie.