About Yakovlev Yak-141 “Freestyle”

The Yakovlev Yak-141 (Яковлева Як-141; NATO reporting name “Freestyle”), also known as the Yak-41, was a supersonic vertical takeoff/landing(VTOL) fighter aircraft designed by Yakovlev. It was used for testing.

Freestyle was first supersonic VTOL aircraft in the world. 

Yak-141 has three engines. The main engine was served by four side-mounted ducts as well as a row of large louvers along the upper surface to allow air to enter the engine during full power hovering. This engine was the R-79V-300, a two-shaft augmented turbofan with a bypass ratio of 1. Maximum thrust was 14,000 kg (30,864 lb). The rear nozzle could rotate from 0 degrees to 95 degrees for VTOL landing and hovering. The two lift engines were the RD-41 design, a simple single-shaft engine made mostly of titanium. Each had a thrust of 4,100 kg (9,040 lb). The engines were installed behind the cockpit at an angle of 85 degrees. Like the Yak-38, the engines received their air through eight spring-operated dorsal flaps, and the exhaust exited through a belly opening covered by two ventral doors.

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Yakovlev obtained funding for four prototypes. The first (48-0, with no callsign) was a bare airframe for static and fatigue testing. The second (48-1, call sign “48”) was a non-flying powerplant testbed. The third and fourth (48-2 and 48-3, call signs “75” and “77”) were for flight testing. While 48-1 remained unpainted, 48-2 and 48-3 were painted in overall grey, with a black radome and fin cap antennas.

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Someone can say F-35 is a copy of Yak-141, and there is some truth. Lockheed was involved in this project, believe or not. Yakovlev stayed without funds to test more prototypes like Yak-41M, so they called few foreign companies to help them. Lockheed corporation (U.S.A.) was in the process of developing the X-35 for the US Joint Strike Fighter program then, so it was good for both sides to join knowledge and experience.

With Lockheed assistance, Yak-141 prototype 48-2 was displayed at the Farnborough Airshow in September 1992. Yakovlev announced that they had reached an agreement with Lockheed for funds of $385 to $400 million for three new prototypes and an additional static test aircraft to test improvements in design and avionics. Planned modifications for the proposed Yak-41M included an increase in STOL weight to 21,500 kg (47,400 lb). One of the prototypes would have been a dual-control trainer. Though no longer flyable, both 48-2 and 48-3 were exhibited at the 1993 Moscow airshow. The partnership began in late 1991, though it was not publicly revealed by Yakovlev until 6 September 1992, and was not revealed by Lockheed until June 1994.

Soviet supersonic VTOL Yak-41(141).

First flight of the Yak-141 was on 9 March 1987, program canceled in August 1991.

General characteristics

  • Crew: 1
  • Length: 18.36 m (60 ft 2¼ in)
  • Wingspan: 10.105 m (33 ft 1½ in)
  • Height: 5.00 m (16 ft 5 in)
  • Wing area: 31.7 m² (341 ft²)
  • Empty weight: 11,650 kg (25,683 lb)
  • Max. takeoff weight: 19,500 kg (42,989 lb)
  • Powerplant: 1 × Soyuz R-79V-300 ( ru) lift/cruise turbofan
    • Dry thrust: 108 kN (24,300 lbf)
    • Thrust with afterburner: 152 kN (34,170 lbf)
  • Lift engines: 2x RKBM RD-41 (ru) turbojets 41.7 kN (9,300 lbf) thrust each)

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Performance

  • Maximum speed: 1,800 km/h (1,118 mph, Mach 1.4+)
  • Range: 2,100 km (1,305 mi)
  • Ferry range: 3,000 km (1,865 mi)
  • Service ceiling: 15,500 m (50,853 ft)
  • Rate of climb: 250m/s (15,000 m/min) (49,213 ft/min)

Armament

  • Guns: 1 × 30 mm GSh-301 cannon with 120 rounds
  • Hardpoints: 4 underwing and 1 fuselage hardpoints with a capacity of 2,600 kg (5,733 lb) of external stores and provisions to carry combinations of:
    • Missiles: R-73 Archer, R-77 Adder or R-27 Alamo air-to-air missiles

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Su-47 (S-37 Berkut) Golden Eagle Fighter

The Sukhoi Design Bureau of Moscow, Russia has developed the Su-47 (previously called the S-37 Berkut or Golden Eagle) fighter aircraft, which first flew in September 1997. Su-47 is in a forward-swept wing configuration and uses a highly unstable triplane (with three main lifting surfaces) aerodynamic configuration. The Su-47 was introduced in January 2000 and completed the first stage of flight trials in December 2001. The aircraft is operated by the Russian Air Force

Su-47 Berkut

Su-47 Berkut

In May 2002, Sukhoi was selected as prime contractor for the next-generation Russian PAK FA fighter programme. The PAK FA fighter aircraft is a development of the Su-47 but without the forward swept wings. The first flight test of the PAK FA fighter aircraft was completed on 29 January 2010.

The design of the very high manoeuvrability prototype is based on the avionics and aerodynamics technologies developed for the Su-27 upgrade programme.

Some of the systems and component designs from the Su-27, (the all weather supersonic fighter aircraft with Nato reporting name Flanker), have been used in the Su-47, for example the design of the canopy, landing gear, some of the avionics and the near-vertical tails.

Su-47manoeuvrability

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, and it also retains manoeuvrability in supersonic flight.The Su-47 aircraft has very high levels of manoeuvrability with maintained stability and controllability at all angles of attack.

Maximum turn rates and the upper and lower limits on air speed for weapon launch are important criteria in terms of combat superiority in close combat and also at medium and long range, when the mission may involve engaging consecutive targets in different sectors of the airspace. A high turn rate of the Su-47 allows the pilot to turn the fighter aircraft quickly towards the next target to initiate the weapon launch.

“The Su-47 has extremely high agility at subsonic speeds.”

The swept-forward wing, compared to a swept-back wing of the same area, provides a number of advantages: higher lift to drag ratio; higher capacity in dogfight manoeuvres; higher range at subsonic speed; improved stall resistance and anti-spin characteristics; improved stability at high angles of attack; a lower minimum flight speed; and a shorter take-off and landing distance.

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Su-47 fuselage

The Su-47 fuselage is oval in cross section and the airframe is constructed mainly of aluminium and titanium alloys and 13% by weight of composite materials.

The nose radome is slightly flattened at the fore section and has a horizontal edge to optimise the aircraft’s anti-spin characteristics.

Forward-swept wings

The forward swept midwing gives the unusual and characteristic appearance of the Su-47. A substantial part of the lift generated by the forward-swept wing occurs at the inner portion of the wingspan. The lift is not restricted by wingtip stall. 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.

The wing panels of the Su-47 are constructed of nearly 90% composites. The forward-swept midwing has a high aspect ratio, which contributes to long-range performance. The leading-edge root extensions blend smoothly to the wing panels, which are fitted with deflectable slats on the leading edge; flaps and ailerons on the trailing edge.

The all-moving and small-area trapezoidal canards are connected to the leading-edge root extensions.

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Armament

The Su-47 experimental fighter aircraft features 14 hardpoints (2 wingtip, 6–8 underwing, 6-4 conformal underfuselage). The hardpoints are equipped with R-77, R-77PD, R-73, K-74 air to air missiles.

It is also fitted with air to surface missiles X-29T, X-29L, X-59M, X-31P, X-31A, KAB-500, KAB-1500.

Click to enlarge

Cockpit

The cockpit’s design has focused on maintaining a high degree of comfort for the pilot and also on the pilot being able to control the aircraft in extremely high g-load manoeuvres.

“The wing panels of the Su-47 are constructed of nearly 90% composites.”

The aircraft is equipped with a new ejection seat and life support system. The variable geometry adaptive ejection seat is inclined at an angle of 60°, which reduces the impact of high G forces on the pilot. The seat allows dogfight manoeuvres with significantly higher g loadings than can normally be tolerated by the pilot.

The pilot uses a side-mounted, low-travel control stick and a tensometric throttle control.

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Landing gear

The aircraft uses a retractable tricycle-type landing gear with a single wheel at each unit. The smaller nose wheel retracts towards the rear and the two mainwheels retract forward into the wing roots.

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Engine

The Su-47 fighter aircraft is powered by two Perm Aviadvigatel D-30F6 turboshaft engines. Around 83.4kN of dry thurst can be produced by each engine. The engine is principally used in short-haul airplanes for passenger transport.

The length and fantip diameter of the engine are 3.98m and 1.05m respectively, while the dry weight and delivery weight of the engine are 1,550kg and 1,712kg respectively. The engine also features a thrust reverser and a low pressure compressor.

Su-47 performance

The Su-47 fighter aircraft can climb at a rate of 233m/s. The cruise speed is 1,800km/h. The range and service ceiling of the aircraft are 1,782nm (3,300km) and 18,000m respectively.

The maximum take-off weight of the aircraft is 34,000kg. The wing loading and maximum g-force of the Su-47 are 360kg/m² and 9g respectively.

 

source: Sukhoi and airforce-technology.com

PAK FA (ПАК-ФА T-50) – close photos

Sukhoi company allowed for the first time journalists to see Russian Stealth fighter T-50 (PAK-FA) from close distance at MAKS airshow 2013, Zhukovsky. PAK-FA was in his hangar in Flight Test Center “Suhogo“ (Сухого) Zhukovsky.

Photographed PAK-FA and other two took a part of the Airshow, flying program, showing amazing figures of aerobatics.

Flying tests of T-50, which will enter into service in Russian Army in 2016/2017., held in “Gromov Flight research institute“ (Летно-исследовательского института имени Громова). Four aircraft are included in tests and until end of 2013. joined them fifth jet with number 055.

Development program and many of characteristics are not yet know. Even if most of its technical specs are secret, some details have emerged. T-50 is produced using stealth technology. Super maneuverable fighter is not limited by weather condition or day/night.

The aircraft is a stealth equipped with a front, side and rear AESA radar, as well as L Band radars. It features TVC (Thrust Vectoring Control), a top speed exceeding Mach 2 and super maneuverability. It should carry a wide variety of weapons including air-to-air, air-to-surface and anti-ship missiles.

In other words, it will be Russian answer on American USAF jets F-22 and F-35.

Current contract with Russian Ministry of Defense is about 60 new PAK-FA fighters.

Close PAK-FA Photos: Marina Lystseva

Photos of all 5 prototypes PAK-FA (T-50), numbers from 51 to 55

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Belly landing of the F-111C / RAAF (Australia) – 18.06.2006.

Successful wheels up landing of F-111C at Royal Australian Air Force base Amberley.

The aircraft lost one main wheel during take off and it was decided the safest method to land was with the complete undercarriage retracted. The arrestor hook system was successfully employed to stop the aircraft. 18 Jun 2006.

 

If you like to see belly landing Su-27, click Su-27 Belly landing.or Russian Knights Su-27 Belly landing video.

Source: www.defence.gov.au

 

Successful wheels up landing of RF-111C

Successful wheels up landing of RF-111C Successful wheels up landing of RF-111C Successful wheels up landing of RF-111C Successful wheels up landing of RF-111C Successful wheels up landing of RF-111C Successful wheels up landing of RF-111C

Dassault Rafale & Su-30MKI / Garuda V

Starting June 2014. “Garuda V“, Indo-French air exercise, held at Jodhpur airbase (India), where fighters from both countries took part of training, Dassault Rafale and Su-30MKI, same classes or 4+ generation fighters.

At least 2 French pilots have done sorties Su-30 MKI  and MiG-27s as well. IAF pilots have been taking spins in the 4 Rafales at Jodhpur as well. Good for everybody for trading or better to say sharing experience to each other.

One nice photo from there:

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