The Sukhoi Su-35 Flanker-E is the top Russian air-superiority fighter in service today, and represents the pinnacle of fourth-generation jet fighter design. It will remain so until Russia succeeds in bringing its fifth-generation PAK-FA stealth fighter into production.
Distinguished by its unrivaled maneuverability, most of the Su-35’s electronics and weapons capabilities have caught up with those of Western equivalents, like the F-15 Eagle. But while it may be a deadly adversary to F-15s, Eurofighters and Rafales, the big question mark remains how effectively it can contend with fifth-generation stealth fighters such as the F-22 and F-35.
The Su-35 is an evolution of the Su-27 Flanker, a late Cold War design intended to match the F-15 in concept: a heavy twin-engine multirole fighter combining excellent speed and weapons loadout with dogfighting agility.
An Su-27 stunned the audience of the Paris Air Show in 1989 when it demonstrated Pugachev’s Cobra, a maneuver in which the fighter rears its nose up to 120-degree vertical—but continues to soar forward along the plane’s original attitude.
Widely exported, the Flanker has yet to clash with Western fighters, but did see air-to-air combat in Ethiopian service during a border war with Eritrea, scoring four kills against MiG-29s for no loss. It has also been employed on ground attack missions.
The development history of the Su-35 is a bit complicated. An upgraded Flanker with canards (additional small wings on the forward fuselage) called the Su-35 first appeared way back in 1989, but is not the same plane as the current model; only fifteen were produced. Another upgraded Flanker, the two-seat Su-30, has been produced in significant quantities, and its variants exported to nearly a dozen countries.
The current model in question, without canards, is properly called the Su-35S and is the most advanced type of the Flanker family. It began development in 2003 under the Komsomolsk-on-Amur Aircraft Production Association (KnAAPO), a subcontractor of Sukhoi. The first prototypes rolled out in 2007 and production began in 2009.
Airframe and Engines
The Flanker family of aircraft is supermaneuverable—meaning it is engineered to perform controlled maneuvers that are impossible through regular aerodynamic mechanisms. In the Su-35, this is in part achieved through use of thrust-vectoring engines: the nozzles of its Saturn AL-41F1S turbofans can independently point in different directions in flight to assist the aircraft in rolling and yawing. Only one operational Western fighter, the F-22 Raptor, has similar technology.
This also allows the Su-35 to achieve very high angles-of-attack—in other words, the plane can be moving in one direction while its nose is pointed in another. A high angle of attack allows an aircraft to more easily train its weapons on an evading target and execute tight maneuvers.
This video of a Su-35 at the 2013 Paris Air Show demonstrates its remarkable maneuverability.
Highlights at 1:30, 3:43, 4:07 and 5:15.
Such maneuvers may be useful for evading missiles or dogfighting at close ranges—though they leave any aircraft in a low-energy state.
The Flanker-E can achieve a maximum speed of Mach 2.25 at high altitude (equal to the F-22 and faster than the F-35 or F-16) and has excellent acceleration. However, contrary to initial reports, it appears it may not be able to supercruise—perform sustained supersonic flight without using afterburners—while loaded for combat. Its service ceiling is sixty thousand feet, on par with F-15s and F-22s, and ten thousand feet higher than Super Hornets, Rafales and F-35s.
The Su-35 has expanded fuel capacity, giving it a range of 2,200 miles on internal fuel, or 2,800 miles with two external fuel tanks. Both the lighter titanium airframe and the engines have significantly longer life expectancies than their predecessors, at six thousand and 4,500 flight hours, respectively. (For comparison, the F-22 and F-35 are rated at eight thousand hours).
The Flanker airframe is not particularly stealthy. However, adjustments to the engine inlets and canopy, and the use of radar-absorbent material, supposedly halve the Su-35’s radar cross-section; one article claims it may be down to between one and three meters. This could reduce the range it can be detected and targeted, but the Su-35 is still not a “stealth fighter.”
The Su-35 has twelve to fourteen weapons hardpoints, giving it an excellent loadout compared to the eight hardpoints on the F-15C and F-22, or the four internally stowed missiles on the F-35.
At long range, the Su-35 can use K-77M radar-guided missiles (known by NATO as the AA-12 Adder), which are claimed to have range of over 120 miles.
For shorter-range engagements, the R-74 (NATO designation: AA-11 Archer) infrared-guided missile is capable of targeting “off boresight”—simply by looking through a helmet-mounted optical sight, the pilot can target an enemy plane up sixty degrees away from where his plane is pointed. The R-74 has a range of over twenty-five miles, and also uses thrust-vectoring technology.