Su-35 Flanker-E

Su-35 Flanker-E

The latest version of the Sukhoi Su-35, Su-35BM (bolshaya modernizatsiya – big modernisation), is an advanced capability multirole air superiority fighter developed from the Su-27. The aircraft has high manoeuvrability (+9g) with a high angle of attack, and is equipped with high-capability weapon systems that contribute to the new aircraft’s exceptional dogfighting capability. The maximum level speed is 2,390km/h or Mach 2.25.

The Su-35BM was unveiled at the Aerosalon MAKS air show in Moscow in August 2007 and its first flight was in February 2008. The SU-35BM entered into serial production as the Su-35S for the Russian Air Force in 2010.

The aircraft was developed, tested and introduced into serial production by the Sukhoi Design Bureau, based in Moscow, and manufactured by KNAPPO of Komsomolsk-on-Amur. Both companies are part of the Sukhoi Aviation Holding Joint Stock Company.

The Russian Air Force ordered 48 Sukhoi Su-35S jets in August 2009 with deliveries scheduled to run until 2015. Sukhoi began producing the components required for assembly of the aircraft in November 2009. An information management system integrated with onboard subsystems and a new phased array radar system with long-range aerial target detection have been installed in the aircraft, which is currently undergoing preliminary testing.

The first Su-35S aircraft was handed over to the 929th State Flight Test Centre (GLITS) for flight tests in August 2011. The Russian Ministry of Defence received six Su-35S production aircraft from Sukhoi in December 2012.

Su-35 Flanker-E cockpit

The cockpit has a central control column and is fitted with a Zvesda K-36D-3.5E zero-zero ejection seat which allows the pilot to eject at zero speed and at zero altitude.

“The front fuselage diameter of the Su-35 has been increased to accommodate the larger 900mm-diameter antenna of the Irbis-E radar.”

The aircraft has a quadruplex, digital fly-by-wire control developed by the Avionika Moscow Research and Production Complex JSC (MNPK Avionika).

The cockpit is fitted with two 230mmx305mm high-resolution MFI-35 liquid crystal displays with a multifunction control panel and a IKSh-1M head up display with a wide 20°x30° field of view.

The pilot has two VHF/UHF encrypted radio communications systems and a jam-resistant military data link system between squadron aircraft and between the aircraft and ground control. The navigation system is based on a digital map display with a strapdown inertial navigation system and global positioning system.

Su-27 based fighter construction

Compared to the Su-27 design from which it is derived, the front fuselage diameter of the Su-35 has been increased to accommodate the larger 900mm-diameter antenna of the Irbis-E radar.

High-strength, low-weight, composite materials have been used for non-structural items such as the radomes, nose wheel, door and leading-edge flaps. Some of the fuselage structures are of carbon fibre and aluminium lithium alloy.

Weapons

The aircraft has 12 hardpoints for carrying external weapons and stores.

Each wing has four hardpoints – one on the wingtip and three under-wing stations. There are two hardpoints on the underside of the fuselage on the centreline and one under each engine.

Missiles

The aircraft’s air-to-air missiles can include the Vympel R-27 (Nato designation AA-10 Alamo), the Vympel radar-guided medium-range R-77 (AA-12 Adder) and the Vympel short-range infrared-guided R-73E (AA-11 Archer).

“The Su-35 multirole fighter can be armed with a range of guided bombs.”

The aircraft’s air-to-surface missiles include the Molniya Kh-29 (AS-14 Kedge) tactical missiles, the Kh-31P (AS-17 Krypton) anti-radiation missiles and the long-range Kh-58UShE (AS-11 Kilter) anti-radiation missiles.

The Su-35 anti-ship missiles include Kh-31A, the long-range Kh-59MK (AS-18 Kazoo), the long-range Kalibr and the NPO Mashinostroenia heavy long-range Yakhont missile.

Ordnance

The Su-35 can be armed with a range of guided bombs, including the KAB-500Kr TV-guided bomb, KAB-500S-E satellite-guided bomb, LGB-250 laser-guided bomb, Kab-1500Kr TV-guided bomb and KAB-1500LG laser-guided bomb.

The aircraft can also be armed with 80mm, 122mm, 266mm and 420mm rockets.

Guns

The Gryazev-Shipunov 30mm GSh-30-1 gun is fitted in the starboard wing root with 150 rounds of ammunition.

Sensors

The X-band multimode phased array Irbis-E radar is supplied by Tikhomirov Scientific-Research Institute of Instrument Design (NIIP), based in Zhukovsky. Irbis-E is a high-performance radar designed for the Su-35 aircraft.

 

The 900mm passive phased array antenna is mounted on a hydraulic actuator for mechanical steering. The electronic steering provides azimuthal and elevation coverage of 60°. With both mechanical and electronic scanning the coverage is 120°.

The radar can detect low-observable and stealth aircraft, unmanned air vehicles and missiles with a radar cross section of 0.01m² at ranges to 90km. Radar modes include air-to-air, air-to-ground, air-to-sea, mapping, Doppler beam and synthetic aperture radar modes. It can detect and track up to 30 airborne targets with a radar cross section (RCS) of 3m² at ranges of 400km using track-while-scan mode.

Infrared search and track

The infrared search and track fire control system, OLS-35 IRST, includes an infrared sensor, laser rangefinder, target designator and television camera. The accuracy of the laser rangefinder is 5m CEP (circular error probability), to a maximum range of 20km against airborne targets and 30km against ground targets. The OLS-35 is a high-performance system with ±90° azimuthal and +60°/-15° elevation coverage.

“The aircraft is powered by two Sturn / UFA AL-31F 117S turbofan engines.”

The system’s acquisition range against a non-afterburning target is 50km forwards and 90km rearward. The Su-35 can also be fitted with a UOMZ Sapsan targeting and laser designation pod.

Su-35 countermeasures

The aircraft’s electronic warfare suite includes a radar warning system, radar jammer, co-operative radar jamming system, missile approach warner, laser warner and chaff and flare dispenser.

Engines

The aircraft is powered by two Sturn / UFA AL-31F 117S turbofan engines with thrust-vectoring nozzle control, each supplying 86.3kN thrust or 142.2kN with afterburn. The engines were developed jointly by Sukhoi, Saturn and UMPO.

“The aircraft can fly at a maximum speed of 2,390km/h.”

The total fuel capacity is 14,350l. In order to increase the unrefuelled range and endurance compared to earlier models the Su-35 incorporates additional tailfin and fin-root tanks. The fuel tanks are of aluminium lithium construction and are located in the wings, fuselage and in the square-tip twin tailfins. The unrefuelled range on internal fuel is 1,580km.

For in-flight refuelling the aircraft is equipped with a refuelling probe on the port side of the nose. Two external fuel tanks, type PTB-2000, provide an additional 4,000l of fuel. The ferry range with two external tanks is 4,500km.

Su-35 flight tests

Flight tests of the Su-35 began on 18 February 2008. During high-speed ground tests in April 2009, the third prototype of the Su-35 programme crashed at Komsomolsk-on-Armur. The crash damaged the new NIIP Irbis-E radar set installed on Su-35.

Performance

The aircraft can fly at a maximum speed of 2,390km/h. The normal and ferry ranges of the aircraft are 3,600km and 4,200km respectively. The maximum altitude is 18,000m. The Su-35 weighs around 18,400kg and the maximum take-off weight is 34,500kg.

Variants

  • Su-27M/Su-35: Single-seat fighter design with a factory code of T-10M (Modernizerovany, “Upgraded”). The first two prototypes had a new forward fuselage, canards and updated fly-by-wire flight-control systems. Like three of KNAAPO’s nine flying pre-production aircraft (T10M-5, T10M-6 and T10M-7), they were converted from Su-27 airframes. The third aircraft (T10M-3) was the first of seven pre-production aircraft to have the taller vertical tails, two-wheel nose undercarriage and in-flight refuel capability. The Su-27M was powered by AL-31FM turbofan engines. Two prototypes, nine pre-production and three production aircraft were constructed by 1995; two static-test aircraft was also constructed (T10M-0 and T10M-4). The aircraft did not enter mass production.
  • Su-37: Technology demonstrator, converted from the eleventh developmental Su-27M (T10M-11). The Su-37 featured a digital fly-by-wire flight-control system, a glass cockpit, the N011M radar, and AL-31FP engines with thrust-vectoring nozzles. The aircraft was later fitted with standard-production AL-31F engines, and had its flight-control system and cockpit systems revised.
  • Su-35UB: Two-seat trainer designed and built by KnAAPO. The single aircraft (T-10UBM-1) featured the canards and taller vertical tails of the Su-27M and a forward fuselage similar to the Su-30MKK. The Su-35UB also shared the avionics suite of the Su-30MKK, although it had a different fly-by-wire flight-control system to accommodate the canards. The aircraft was powered by AL-31FP engines with thrust-vectoring nozzles. Although a training aircraft, the Su-35UB was designed to be fully combat-capable.
  • Su-35BM: Single-seat fighter that is a major redesign of the original Su-27. The type features significant modifications to the airframe, including the removal of canards and dorsal air brake as found on the Su-27M. It features the updated N035 Irbis-E radar and a redesigned cockpit. The aircraft is powered by thrust-vectoring AL-41F1S turbofan engines that are capable of supercruise. Also known as T-10BM (Bolshaya Modernizatsiya, “Major Modernization”), Su-35BM is not the actual designation used by Sukhoi, who markets the aircraft as “Su-35”.
  • Su-35S: Designation of production T-10BM design for the Russian Air Force. According to Aviation Week & Space Technology, “S” stands for Stroyevoy (“Combatant”).

Specifications

Crew 1
Length 21.9 m (71 ft 10 in)
Wingspan 15.3 m (50 ft 2 in)
Height 5.9 m (19 ft 4 in)
Wing area 62 m2 (670 sq ft)
Empty weight 19,000 kg (41,888 lb)
Gross weight
25,300 kg (55,777 lb)
Max take off weight 34,500 kg (76,059 lb)
Power plant (Dry thrust)
2 × Saturn AL-41F1S afterburning turbofan, 86.3 kN (19,400 lbf) thrust each
Power plant (Thrust with afterburner) 
2 x 142 kN (32,000 lbf)
Maximum speed (Sea level)
Mach 1.13 (870 mph, 1,400 km/h)
Maximum speed (High altitude) Mach 2.25 (1,500 mph, 2,400 km/h)
Combat radius
1,600 km (990 mi, 860 nmi)
Ferry range
4,500 km (2,800 mi, 2,400 nmi)
Service ceiling
18,000 m (59,000 ft)
Rate of climb 280 m/s (55,000 ft/min)
Wing loading 500.8 kg/m2 (102.6 lb/sq ft)
Thrust/weight  1.13
Design load factor  +9g
Avionics

 

  • Irbis-E passive electronically scanned array radar
  • OLS-35 infra-red search and track system
  • L175M Khibiny-M electronic countermeasures system
Armament

 

  • Guns: 1 × internal 30 mm Gryazev-Shipunov GSh-30-1 autocannon with 150 rounds
  • Hardpoints: 12 hardpoints, consisting of 2 wingtip rails, and 10 wing and fuselage stations with a capacity of 8,000 kg (17,630 lb)

Operators

  • People’s Liberation Army Air Force (China) – 24 aircraft in inventory.
  • Egyptian Air Force – 24 on order after contract was signed in 2018.
  • Indonesian Air Force – 11 aircraft on order.
  • Russia
    • Russian Air Force – 92 aircraft in inventory. The third order for 36 aircraft finalised in August 2020 is to increase the number to 128.
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