Avions de combat russes

Russia will start tests of its fifth-generation fighter in 2010, Deputy Prime Minister Sergei Ivanov said on Tuesday.
"The trials will begin in 2010," Ivanov said. Earlier reports said test would start before the end of this year.
Deputy Defense Minister Vladimir Popovkin has said the fighter, which has been under development since the 1990s, will enter service with the Air Force in 2015.
Russia's one known fifth-generation project is Sukhoi's PAK FA and the current prototype is the T-50. It is designed to compete with the U.S. F-22 Raptor (the world's only fifth-generation fighter aircraft) and F-35 Lightning II, but has yet to take to the skies.
The T-50's maiden flight has been repeatedly postponed since early 2007 for unspecified reasons.
However, in August 2009, Russian Air Force Chief Alexander Zelin said that there were problems with the engines and research was ongoing.
The PAK FA is believed to possess advanced avionics, stealth capability, a ferry range of 4,000 to 5,500 km, and endurance of 3.3 hrs; it is armed with next-generation air-to-air, air-to-surface, and air-to-ship missiles, and has two 30-mm cannons.

[Vous devez être inscrit et connecté pour voir ce lien] has conducted the first flight of its prototype PAK FA fifth-generation fighter, with the aircraft having conducted a 47min sortie this morning.
Flown from KnAAPO’s Komsomolsk-on-Amur site, the PAK FA was piloted by Sergei Bogdan, and “performed excellently”, says Sukhoi.
“In the course of the flight we conducted initial evaluation of the aircraft controllability, engine performance and primary systems operation,” says Bogdan. The aircraft’s landing gear was also retracted and lowered during the first flight.
The PAK FA is powered by two NPO Saturn "Item 117" engines, developed from the Item 117S design already flown on Sukhoi’s Su-35 and a Su-27M testbed. The experimental aircraft’s integrated flight control system controls the engines, along with all other major systems.
Sukhoi says other key design elements include the use of composite materials, advanced aerodynamic techniques and measures to reduce the aircraft’s engine signature, which it claims results in an “unprecedented small radar cross section in radar, optical and infrared range”. The PAK FA is also equipped with an advanced phased-array antenna radar, it adds. Russia's Tikhomirov NIIP displayed an active electronically scanned array design for the fighter at last year's Moscow MAKS air show.
“This is a great success of both Russian science and design school,” says Sukhoi director general Mikhail Pogosyan. “The PAK FA programme advances Russian aeronautics, together with allied industries, to an entirely new technological level.
“These [PAK FA] aircraft, together with upgraded fourth-generation fighters, will define Russian air force potential for the next decades,” he adds.
The first stage of flight trials involving the PAK FA prototype will last until 2012, when the Russian defence ministry and air force are expected to decide on the future of the project. A production version is expected to be designated the T-50.
The new design could also form the basis of a proposed fifth-generation fighter to be produced in collaboration between Russian and Indian companies.
“I am strongly convinced that our joint project will excel its Western rivals in cost-effectiveness and will not only allow strengthening the defence power of Russian and Indian air forces, but also gain a significant share of the world market,” says Pogosyan.

Russia's prototype fifth-generation fighter made a 45-minute maiden flight on Friday in the Far East, Russian television reported, according to RIA Novosti.
The flight had been postponed for 24 hours due to poor weather conditions in Komsomolsk-on-Amur where the prototype is being tested.
"The plane showed a superb performance. It has met all our expectations for the maiden flight," said Olga Kayukova, a spokesperson for the Sukhoi aircraft manufacturer.
Russia has been developing its newest fighter since the 1990s. The country's top military officials earlier said the stealth fighter jet, with a range of up to 5,500 km, would enter service with the Air Force in 2015.
Russia's fifth-generation project is Sukhoi's PAK FA and the current prototype is the T-50. It is designed to compete with the U.S. F-22 Raptor, so far the world's only fifth-generation fighter, and the F-35 Lightning II.
The PAK FA is to be equipped with the most advanced technology and armed with next-generation high-precision weaponry.
India, which has a long history of defense relations with Moscow, remains Russia's sole partner in the project.
India's Hindustan Aeronautics Ltd (HAL) was reported to be seeking a 25% share in design and development in the project. It has also sought to modify Sukhoi's single-seat prototype into the twin-seat fighter India's Air Force wants.

On 29 January 2010, the Sukhoi PAK-FA (Perspektivnyi Aviatsionnyi Kompleks Frontovoi Aviatsy, literally "Future Front line Aircraft System"), which could variously be described as a technology demonstrator, the first prototype of the future T-50 fighter, or an intermediate step between the two, took to the air for the first time from the freezing runway of Dzemgi Air Force Base (shared with the KnAAPO plant) at Komsomolsk-on-Amur in the Russian Far East Siberia (see also [Vous devez être inscrit et connecté pour voir ce lien]). A fundamental step has at last been accomplished in the development of the long-expected Russian response to the American F-22 RAPTOR air dominance fighter.

(Part two of the article can be viewed here: [Vous devez être inscrit et connecté pour voir ce lien])


The aircraft, with Sukhoi test pilot Sergey Bogdan in the cockpit, remained airborne for 47 minutes, enabling an initial evaluation of its controllability, engine performance and primary systems operation, including retraction and extraction of the landing gear. “The aircraft performed excellently at all flight-test points. It is easy and comfortable to pilot”, said Sergey Bogdan.

“Today we’ve embarked on an extensive flight test programme of the 5th generation fighter,” commented Mikhail Pogosyan, Sukhoi Company Director General. “This is a great success of both Russian science and design school. This achievement rests upon a cooperation team comprised of more than a hundred of our suppliers and strategic partners. The PAK FA programme advances Russian aeronautics together with allied industries to an entirely new technological level. These aircraft, together with upgraded 4th generation fighters will define Russian Air Force potential for the next decades.

“Sukhoi plans to further elaborate on the PAK FA programme which will involve our Indian partners”, Mr Pogosyan added. “I am strongly convinced that our joint project will excel its Western rivals in cost-effectiveness and will not only allow strengthening the defence power of Russian and Indian Air Forces, but also gain a significant share of the world market”.

Some Russian sources have suggested that the T-50 will enter service in 2015 (e.g. Russian 5th-generation fighter deliveries delayed until 2015), but this is but wishful thinking. Only another flyable PAK FA prototype and a ground test item exist thus far, while Sukhoi has indicated they will complete five prototypes for initial testing. These are scheduled for completion in 2011-12, with the company expecting to then produce an initial batch of pre-series aircraft for operational trials by 2015. A more credible projected IOC date for the T-50 would thus be towards the end of the decade - i.e. some 12-15 years after the F-22. Such a delay would be roughly in line when not with the scientific and technological potential of the Russian aerospace industry, then certainly with the Russian MoD’s financial muscle and the irredeemable time loss of the “black years” following the collapse of the USSR. There are persistent rumours of the PAK FA programme being largely financed directly by Sukhoi (some 75%, with the remaining 25% being provided by India), and in any case it is quite obvious that it could only progress thanks to the substantial revenues from export sales of Su-27/-30s.

Much has already been written and speculated about this first Russian 5th combat aircraft, but virtually nothing is known for certain. The few photos and the couple of videos documenting the first flight are all that is available for a first assessment of the aircraft’s characteristics, analysing its overall external configuration and trying to deduct the Russian Air Force’s requirements on which the PAK FA design can be assumed to be tailored.


Operational Considerations

As expected, the twin-engine PAK FA is a large aircraft, with roughly the same physical size and weight class as the Su-27/-30 family it is aimed to replace. The aircraft’s general configuration strongly suggests a design optimised primarily for the air superiority role, even though the T-50 will almost certainly eventually go along the same road as the Su-27 and evolve into a very capable multirole fighter-bomber. This emphasis on air-to-air combat is arguably due to both the Russian Air Force perceiving its main roles in a very different way than the USAF, and the fact that the Service’s deep strike requirements are satisfactorily covered by the very capable (although admittedly not stealthy) Su-34s currently being delivered.

Even though it is nearly automatic to think of the PAK FA/T-50 in terms of a direct confrontation vs. the F-22, and this may indeed have been the original goal when the programme was first launched in the late 1980s, in the current global strategic scenario it is perhaps more likely that the Russians are rather interested in maintaining an air superiority edge over China’s current J-11s/SU-27s/-30s and future J-12. Also, the expected future worldwide usage of the F-35 JSF attack aircraft with its low observability qualities requires an interceptor capable to deal with this peculiar threat.

Further considerations can be done as regards the expected future place of the T-50 in the Russian Air Force’s inventory, and thus the overall combat aircraft programmes in Russia. When first information on the PAK FA project started to circulate, the programme was widely reported to be intended to replace both the Su-27 and the MiG-29, thus leading to a single-type combat aircraft fleet not unlike the French Air Force’s with its RAFALE. Whether this was purely “disinformacija”, or the Russians were actually planning in that direction back then, it is impossible to ascertain. The fact is, the T-50 given its size and expected avionics complexity will most definitely be an expensive aircraft both to procure and operate, and it is very difficult to imagine how the Russian Air Force could ever be able to acquire it in large number - not to mention the type, for all of Mr Pogosyan’s rosy forecast, having a rather limited potential export market. Current Western and unofficial Russian estimates are of a production run of some 250 aircraft for the Russian Air Force, and even this may prove to be overoptimistic. The combination of the T-50 as the spearhead of a tactical combat fleet composed largely by modernised 4th generation types, as suggested by Mr. Pogosyan, does certainly make sense - but it is rather doubtful whether it could really last for “decades”, apart from the Su-35. Also, the upgrade programmes currently underway do not involve the MiG-29.

Hence, and although the notion of the Russian MoD and national industry being able to sustain the simultaneous development and eventual procurement of t w o different 5th generation fighters does admittedly defy imagination, the eventual launch of a programme for a smaller and less expensive “lo” fighter in a “hi/lo” mix with the T-50 looks virtually compulsory. Failing to do so would leave the Russian Air Force critically crippled in quantitative terms, and would consign the future export market for “affordable” fighter aircraft to Western and Chinese designs.

Airframe

The aerodynamic configuration of the PAK-FA maintains a vague reference to the Su-27 as regards the fuselage and the location of the engines, which are installed in widely separated nacelles forming a tunnel with the flat bottom of the fuselage. The general planform is a tailed delta, similar to the F-22, with the all-moving horizontal tailplanes close-coupled and on the same plane to the wing without any gap. The twin vertical surfaces, canted outward by perhaps 25°, are also all-moving. This solution has been used rarely in recent times; in particular the ill-fated Northrop YF-23 had a pair of all-moving butterfly tailplanes. The all-moving verticals however had been fairly used in supersonic designs dating back to the late 1950s or 60s, in particular the SR-71 which used a pair of all-moving verticals canted inward to reduce the induced roll moment when the surfaces were rotated, and most of the North American design of the period - the RA-5C VIGILANTE, its contemporary YF-107 and the unique XB-70 - as well as the British BAC TSR 2 used a similar solution. In the PAK FA design, their reason d’être arguably consists in enabling the smallest possible vertical surfaces for the sake of reduced radar signature and supercruise drag, while at the same time also maintaining (in combination with the 3D TVC nozzles) excellent manoeuvrability.

The underfuselage tunnel between the engine nacelles contributes significantly to the overall aerodynamic lift generation, just as in the Su-27 and MiG-29 as well as in the F-14 - arguably the real originator of the “centreplane lift” concept. This lift is added to that provided by the large wing and should enable excellent manoeuvrability even at high altitude - a potential advantage of the F-22 and now the PAK FA over all their rivals. The widely separated engines also offer much better survivability in the event of battle damage or accidental fire/explosion.

The fuselage sides have marked “chines”, again like the F-22 and its unfortunate competitor, the YF-23. This shaping can be assumed both to contribute toward reducing radar reflectivity and to develop, at high angles of attack, favourable lift-enhancing vortexes flowing above the inner wing upper surface just above the engine nacelles. The wing has dropping leading edges providing for a variable camber airfoil and separate flaps and ailerons, these latter contributing towards enhanced TO/landing performance (this should anyway be very good, given the huge lift generated by the aircraft configuration as a whole). The inner part of the wing leading edges is stepped longitudinally with a much longer chord which blends forming, in part, the engine nacelles’ upper “lips” and then merging into the fuselage to enhance the lift generating characteristics of the overall aircraft configuration, somewhat akin to a lifting body. Possibly for this reason, but also to ease a smooth airflow into the engines at very high angle of attack, the upper intake projecting false “lips” appear to be hinged parallel to the sweep real intake lips, thus providing a variable camber like the wing leading edge. In this way, the upper surface of the air intake contributes to overall lift generation. It is also possible that the movements of these peculiar elements, when linked to the full authority digital flight control system, could contribute in some way to the aircraft’s longitudinal control, acting like a third control surface (in line with the Sukhoi tradition as exemplified in the three-surfaces Su-30MKI). It seem however clear that the “lips” cannot move as fully independent control surfaces, due to their primary role in ensuring a correct airflow to the engines.

The possible rationale behind the fuselage “chines” and wing strakes could be to generate two vortexes over each wing upper surface, thus enhancing lift (via more diffused vortex lift) at high angle of attack (AoA). In particular, the two inner vortexes (those generated by the fuselage “chines”) would energise the airflow over the inner wing upper surface blending with the fuselage above the engine nacelles. The two outer vortexes (those generated from the wing strakes outboard the intakes lips) would transfer their kinematic energy to the upper outer panel wing airflow. Furthermore, given the expected path of such latter vortexes, they would also interact with the upper airflow over the all-moving horizontal tailplanes - thus replicating the superior longitudinal control provided in the Su-27 by its peculiarly located slab tailplanes.*

Summing up, lift appears to be generated by following elements, working in a synergic way:

• Wing outer panels (outside the engine nacelles) with dropping leading edges (variable camber airfoil);
• Engine nacelles upper surface blended with outer wing panels and fuselage with dropping intake upper false lips/leading edges (variable camber);
• Fuselage tunnel between the engine nacelles;
• Vortexes generated from the front fuselage “chines“, enhancing the engine nacelles upper surface lift and possibly the all-moving verticals’ control authority at very high AoA;
• Vortexes generated by the wing strakes outboard the engine nacelles, enhancing the outer wing panels lift and possibly the all-moving horizontal tailplanes control authority at very high AoA.

The fuselage has the already mentioned flat bottom and a straight tapered upper part ending in a flat and somewhat smaller “sting” between the engine exhausts. The installation of a braking parachute in a bay in the upper part of the sting makes room for the rational introduction in the extreme tailcone of a wide-scanning ECM antenna or perhaps a rear hemisphere surveillance/tracking radar (experiments were carried out a few years ago on a modified Su-32FN). The second prototype, which was used for taxi trials on 23 January appears to have a different tail cone, for unclear reasons.

The rear fuselage beavertail appears wider than in the Su-27/-30 albeit with a similar layout, and should offer more freedom of movement to the multi-axis thrust vectoring control (TVC) exhaust nozzles which will most certainly be fitted to the engines of the T-50 (although their current presence on the PAK FA is not certain). This configuration with the widely exposed round engine exhaust nozzles is however detrimental in terms of rear-emisphere IR and radar signature.

The PAK FA is claimed by Sukhoi to offer “unprecedented small signatures in the radar, optical and infrared range”, and this is certainly true as regards Russian combat aircraft and quite possibly all existing non-American designs. At the same time, it is evident that the PAK FA has been designed with a close attention to stealth characteristics, but is not intended to be an uncompromising stealth aircraft à la F-22. When certain design features detrimental to low observability were deemed to be all-important, these were adopted nonetheless. It would be extremely interesting to watch the eventual results of this approach in terms of maintainability and operational availability, particularly in the light of the in-service experience so far with the F-22.

An element which maintains some similarity to the Su-27 family is the landing gear. All the members retract forward, easing the emergency extension which in this way can be accomplished simply by gravity and air pressure. The main tyres, again like the previous Sukhoi design, when retracted lays flat in bays partially above the air intakes and partially inside the thick wing root fairing born out from the air intake upper part and as a continuation of the sweep surface linking the fuselage side to the outer wing, running above the upper air intake lip.

The PAK FA appears to be built with a significant percentage of composites, including most of the wing, horizontal tailplanes and dropping intake lips skin, centre-forward engine nacelles, most of the fuselage skin and the doors of the weapons bays and landing gear bays. Metal parts seem to include the dropping wing and intake lips leading edges (with the exception of the inner sections where the conformal aerials are expected to be installed, and which should thus be built of dielectric material), the engine intakes and the wide fairings blending the outer wing panels to the fuselage. Press reports suggest a 75% (being weight) being made of titanium alloys and 20% by composites, which sounds plausible.


Powerplant

The planned engine for the T-50 is understood to be the new Saturn AL-41F, expected to offer about 17.5 tons of thrust in full afterburning mode and somewhere in the range of 12 tons in dry mode. The latter figure would comfortably enable supercruising (i.e., supersonic cruise flight without afterburner) at around Mach 1.5, thus in the same class as the F-22. The prototype/technology demonstrator now flying was expected to be powered by the Saturn 117S, a much improved version of the AL-31F intended for the Su-35 but still less powerful at 14.5 tons in full afterburning than the AL-41F. There however are some indications to suggest that the aircraft already has the new engines.

The engines are fed by two-dimensional raked air intakes with the upper lip generating an oblique shock wave favourable to dynamic pressure recovery in the supersonic regime, which for the PAK FA could approach Mach 2.3÷2.5. While in appearance of fixed geometry, it is possible that a variable-position upper ramp, to generate multiple oblique shocks is part of the system for a further better dynamic pressure recovery in the high supersonic speed regime.

The tight shape of the engine nacelles and the position of the ventral “venetian blind” auxiliary intakes seem to suggest that the PAK FA does not feature a serpentine air duct to the engine compressors, as typically adopted for low-RCS aircraft. It is possible that the Sukhoi designers have preferred to limit the compressors’ strong radar reflection by inserting a grill in front of them, while optimising the air intakes for higher max. speed and supercruise performance.

The engines are mounted with a slight forward convergence (some 3°). This, in twin-engine aircraft with conventional exhaust nozzles, would typically reduce thrust asymmetry in the event of an engine flame-out - although with the drawback of reduced controllability. Given however the installation of TVC nozzles, the choice of converging axis built into the nacelles could be the outcome of an aerodynamic local airflow optimisation due to interaction of all the aircraft elements.

A large fuel capacity in line with the previous Sukhoi fighters is certainly provided, let’s say in the order of 12,000 litres. A fully-retractable in-flight refuelling probe is installed on the left side of the fuselage in front of the windscreen.


Armament

The standard air-to-air armament is carried internally in two identical tandem weapon bays, which can be estimated at about 5m x 1.2-1.3m. The bays’ position inside the tunnel between the engine nacelles ensures a discrete opening of their doors at weapons launch, otherwise a drawback for a stealth aircraft. In addition, the doors have saw tooth-shaped edges to further reduce radar signature. The size of the bays can be assumed to allow internal carriage of eight R-77-class radar-guided AAMs with folding wings, i.e. the same figure as for the F-22.

Similar to American 5th generation types, for the “second/subsequent” days of war operations, four additional underwing hardpoints can be installed under the outer wing panels. However no wingtip store positions appear to have been foreseen. A dark area to the right side of the upper front fuselage under the cockpit betrays the installation, similarly to the Su-27, of a single cannon (a 30mm GSh-30-1?) for close combat engagements.


Avionics

The combat avionics of the T-50 has been under development for some time, and some elements will almost certainly be installed in the Su-35 interim fighter. The main sensor will be a Tikhomorov NIIP X-band radar with active AESA antenna, which was unveiled at the latest MAKS Air Show in August 2009. The 1m-dia. antenna contains some 1,500 solid stat transmit/receive modules by NPP Pulsar, which places it in the same class as the F-22’s APG-77. Tikhomorov claims an exceptional range of ~400km against a 1m² equivalent radar surface target. The radar entered bench testing in November 2008, and a flyable operational prototype will be completed by mid-2010.

In a very innovative development, the main X-band antenna will be supplemented by auxiliary L-band antennas installed in the wing inboard leading edges. In addition to the obvious IFF/SSR functions, this arrangement (which is also being offered for retrofit on the Su-27/-30 family as well as the Su-35), has a very clear anti-stealth search function. Most current stealth or semi-stealth designs - and most particularly the F-35 JSF, although not the F-22 - are optimised to reduce radar signature against X-band fire control radars as the main threat, and their low-observability features and shapings do not work as well against L-band radars. Of course, the lower the frequency the higher the wavelength the poorer the accuracy of distance and angular measurements, and thus even apart from excessive volume, weight, power and cooling requirements a fighter aircraft could not possibly rely on a main L-band system alone. However, the presence of the additional L-band antennas will provide an important early warning function against at least some low-observable targets, and it may also enable a “mini-AWACS” role. It is additionally conceivable that these antennas could also be used for the detection and disruption of sensors and digital communications systems operating in L-band, including e.g. the all-important JTIDS/MIDS/Link-16.

While the PAK FA has no functioning radar yet, it already sports the protruding head of an electro-optic IRST system in front and to the right of the cockpit’s windscreen. This will maintain the excellent mixed solution (radar/IRST) used in all modern Russian fighters, event tough the IRST seeker’s “ball” is at odds with the search for a reduced radar signature in the front emisphere. The decision to add the L-band antennas while maintaining the IRST reinforces the perception of the T-50 being mainly intended for air defence roles against intruding low-observable strike aircraft.


The Indian Factor

Back in early 2007, Russia and India reached an agreement to cooperate on a Fifth Generation Fighter Aircraft (FGFA) based on the PAK FA for the Indian Air Force. The programme is officially described as involving a 50-50% split as regards both financing and R&D activities, but it is nearly universally understood to rather cover a scheme, under which India will fund a substantial portion of the PAK FA’s development bill in exchange for access to the relevant technologies.

The Indian Air Force’s requirements do differ rather substantially from the Russian Air Force’s, and are reported to demand a twin-seat configuration as well as possibly a different wing and control surfaces. Hindustan Aeronautics Ltd is expected to become responsible for some 25% of the total development workload for the FGFA programme, involving modifying the PAK FA single-seater airframe to a twin-seater configuration as well as the mission computer, navigation system, cockpit displays and ECM dispensers. HAL will of course also take care of eventual series production of a tentatively planned total of some 200-250 aircraft.

Indian sources have ventured into suggesting that the FGFA could be in service by 2015, but this is quite obviously not feasible given that development has not yet started. A logical date would be well into the 2020s.


Conclusions

As a first tentative assessment and on the basis of the basis of the scarce information as currently available, the PAK FA (T-50-1?) looks like a mix of well-proven solutions from previous Sukhoi designs married to several new ideas, in particular as regards the still superior quality of Russian aerodynamic research.

It is also possible that the significant delay suffered in developing a Russian counterpart to the F-22 could have turned into a blessing in disguise, giving Sukhoi designers a period of reflexion to generate a well balanced design. This would relate in particular to the decision not to push for extreme low observability characteristics at the expense of everything else, including not only flight performance but also acquisition costs and most importantly maintenance requirements and thus operational availability.

La Russie veut produire un millier d'avions furtifs T-50

NEW DELHI, 12 mars (Reuters) - La Russie va produire plus de mille chasseurs furtifs dans les prochaines quarante années, pas seulement pour son armée de l'air mais aussi pour l'exportation, notamment à destination de l'Inde, a annoncé vendredi à New Delhi le directeur du constructeur Sukhoï, Mikhaïl Pogosian.
Le nouveau chasseur T-50 de cinquième génération, longtemps retardé, a effectué son premier vol d'essai fin janvier. Moscou affirme qu'il pourra rivaliser avec l'américain F-22 Raptor, construit il y a plus de dix ans.
Sukhoï espère que le T-50 sera opérationnel d'ici cinq ans.
"Pour ce qui est des appareils de ce type, il y a un marché pour plus de mille exemplaires", a dit Pogosian en marge de la visite du Premier ministre russe Vladimir Poutine en Inde. "Je pense que plus de 200 appareils seront livrés à l'Inde", a-t-il ajouté.

Sukhoi intends to add three more T-50 development aircraft to the test program within the next 12 months, with further details of Russia’s next-generation fighter leaking out from a high-level gathering here.
Russian Prime Minister Vladimir Putin held a cabinet meeting last week on developing the aerospace and defense industry at Sukhoi’s Moscow headquarters. Putin was also shown the T-50-0 static test rig airframe along with a cockpit simulator for Russia’s fifth-generation fighter.
Putin and Sukhoi’s chief, Mikhail Pogosyan, maintain that the T-50 should be ready to enter service with the Russian air force during 2015, to meet its PAK FA fighter requirement. Putin says, however, that “before the jet goes into serial production, it should complete more than 2,000 test flights.”
Given what is already an highly demanding schedule, Pogosyan is quoted in the Russian press as saying: “By the end of 2010 or in early 2011, we must add three more prototypes to the test-flight program.”
Sukhoi executives suggest the second prototype will likely enter testing this year, while the third and fourth prototypes will appear in 2011. The first two will not be fitted with radar or weapon control systems, and will be used primarily for flight performances and major systems evaluations.
Sukhoi designers are trying to compress the T-50 development through the extensive use of specialized system-integration test benches. The development of previous aircraft types was supported with the use of “iron bird” rigs for complex flight control system checks and an “electronic bird” for the avionics package testing, coupled with stationary engineering simulators used for “man-machine” interface development.
For the T-50, in addition to these tools, Sukhoi seems to have built an additional prototype not intended for flights—the so-called T-50-KNS. This airframe is fitted with operational systems, equipment and engines.
Sukhoi’s production facility in Komsomolsk has used the T-50-KNS for checking the use of new manufacturing technologies, while designers were able to examine all wiring, ducting, equipment and engine installation within the actual dimensions of the aircraft. The T-50-KNS and other test-bench checks ensured the initial flights of the T-50-1 prototype. Pogosyan says a 24-deg. angle of attack was reached on the T-50-1 after only three flights.
The company’s T-50 chief designer, Alexander Davidenko, says almost 70% of the outer surface— 25% of the aircraft’s empty weight—consists of composites . Introduction of the materials allowed the number of structural parts to be cut four-fold compared with the Su-27 Flanker.
As for the cockpit, Davidenko notes that the aircraft’s avionics use smart digital systems to reduce pilot workload in terms of flying and combat operations.
The T-50’s digital flight control system is around 30% lighter than the Su-27’s and can reconfigure in case of failure or combat damage, says Pogosyan.
The T-50 will be tested and enter air force service, with the engine being used for the “first phase of development.” The engine is already installed in the prototype, says Pogosyan. “This is a completely new engine,” he contends, “developed especially for this aircraft. It has a modern design, which is able to ensure the T-50’s long-term operation.” A completely new powerplant could be developed in the next 10-12 years, he adds.
In April, the T-50 flight-test program likely will shift to the Gromov Flight Test Research Institute in Zhukovsky, near Moscow, according to company executives.
The T-50 development is being viewed by the government as a confirmation of the industry’s ability to meet the military’s future equipment needs and to revamp its present inventory.
In 2008, Moscow began to increase procurement of combat aircraft and systems, in an attempt to roll back more than a decade of neglect and stagnation. Contracts to supply the air force with 130 combat aircraft were signed in 2008 and 2009. In 2010, 27 aircraft, more than 50 helicopters and five S-400 missile system divisions will be purchased for the army.
The nation’s armament program calls for the delivery of more than 1,500 aircraft and helicopters and about 200 air defense systems through 2020. At least 80% of the air force procurement and 75% of the air defense systems will be new hardware.
Discussing industry priorities, Putin stresses that the sector had received substantial support from the government and should now concentrate on efficiency. It must fulfill its obligations in terms of deliveries and weapon-cost parameters.
Putin also reinforced Russian ambitions to develop a next-generation strategic strike aircraft—the PAK DA—as well as a next-generation surface-to-air missile system.

Just popped up on YouTube, a couple of interesting T-50 videos. The first is an overview of some of the technologies involved in the aircraft.

Noteworthy points: the video highlights a new honyecomb core material designed for high temperatures. It also states that the T-50 will have no fewer than five radar arrays: the 1500-module forward active electronically scanned array (AESA), two side-facing X-band sub-arrays and two "decimetric" (L-band) arrays in the leading-edge root extensions. It also states that the goal is to fight the F-22 by closing within visual range.

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Another new video shows a novel inlet radar blocker. The compressor face of a jet engine is one of the least stealthy parts of an airplane. Not only will the whirling blades, at some point, reflect radar energy directly back at whoever is looking for you, but the shape and rotational rate will identify you, because computers can count very, very fast.

Step 1 in dealing with this problem is to coat the inlet duct with radar absorbent material, because a lot of radar energy bounces off the duct wall several times on the way in and out again. High-level stealth, though, means physically blocking the line of sight with a "serpentine" duct (which is done on the F-22, JSF and Typhoon). But that can take up a lot of space, particularly with big engines, and isn't practical for a stealth retrofit or on some new designs.

The Super Hornet, for example, has short inlet ducts so line-of-sight blockage by curvature isn't practical. The solution was to install a blocker in the inlet duct - looking down the duct, you see what looks like a compressor face, but isn't. It's a fixed composite structure, RAM-coated. And of course any stray electrons that do make it through the blocker and hit the compressor have to make it out through the blocker again. Problem: what bends electron flux also bends airflow, so you can get losses.

Via[Vous devez être inscrit et connecté pour voir ce lien] comes an image of what is said to be the radar blocker for the Sukhoi T-50 PAK-FA, which looks solid if a bit lossy:

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But the same thread also includes a Russian video of a more elegant solution:

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It uses flexible vanes with a rotating ring at the rear end: in the "stealth regime" it provides extensive blockage, but it clears the airflow when it doesn't matter or you need full speed or power. One challenge would be the structural design, because the last thing you want is a piece of RAM flaking off the moving surface and FODing out your motor. But it could be an interesting Su-35 modification.

Chasseur russe de 5e génération: plus performant que son équivalent US (Poutine)

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[Vous devez être inscrit et connecté pour voir ce lien] sera plus performant et coûtera 2,5 à 3 fois moins cher que son équivalent américain, a annoncé le premier ministre Vladimir Poutine.

Le chef du gouvernement a suivi jeudi dans la région de Moscou un vol d'essai du T-50, premier chasseur tactique russe de cinquième génération. Le vol terminé, il a conversé avec le pilote de l'avion Sergueï Gromov.

Après avoir rappelé que le T-50 coûterait 2,5 à 3 fois moins cher que le F-22 américain, M.Poutine a fait savoir que le chasseur russe "le surpasserait également pour la manœuvrabilité, les armements de bord et la distance de vol".

"Et pour l'esprit de combat!", a ajouté le pilote en plaisantant.

Chasseurs 5e génération: 50 appareils pour l'armée russe en 2016

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Au moins 50 chasseurs de 5e génération seront fournis au ministère russe de la Défense en 2016, a annoncé jeudi aux journalistes le vice-ministre Vladimir Popovkine.
Interrogé sur la quantité de chasseurs de 5e génération que les forces aériennes russes envisageaient de commander, le vice-ministre a répondu: "Pendant la première étape il s'agira de plusieurs dizaines d'avions, plus de cinquante".
[Vous devez être inscrit et connecté pour voir ce lien] a effectué jeudi son 16e vol à l'aérodrome de Joukovski, dans la région de Moscou. L'événement a été suivi par le premier ministre russe Vladimir Poutine ainsi que par des représentants de l’avionneur Soukhoï et du ministère de la Défense.
Le chasseur russe de 5e génération T-50 est développé en Russie depuis les années 1990. Des essais en vol ont récemment eu lieu à Komsomolsk-sur-Amour (Extrême-Orient russe). Il s'agit d'un appareil tactique alliant les caractéristiques d'un avion de frappe et d'un chasseur classique.
Le chasseur est équipé d'une avionique foncièrement nouvelle intégrant une fonction "pilotage électronique" et un radar ultramoderne, ce qui permet au pilote de se concentrer uniquement sur la mission de combat. Les équipements de bord assurent un échange de données en temps réel aussi bien avec les systèmes de commande au sol qu'avec les autres avions du groupe aérien.

Indian officials get up close to new-look PAK FA fighter

Russia has conducted a flight demonstration with its prototype PAK FA fighter for a delegation of Indian defence ministry and industry officials.
Held at Ramenskoye aerodrome near Moscow on 31 August, the 10min display was made in support of talks over the bilateral development by Moscow and New Delhi of a new fifth-generation fighter.
Indian officials inspected Sukhoi's lone PAK FA following the demonstration, which included low-speed passes and high angle-of-attack manoeuvres. The aircraft, which will be followed by two more prototypes before the end of the year, is pictured with new-look camouflage markings.

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The new fighter programme is a topic of discussion by an Indo-Russian commission for military industrial co-operation, along with another to produce a multi-role transport aircraft with a 20t payload capacity.
New Delhi is insisting on executing both programmes as joint ventures, with equal sharing of investment and workshare.
Russia's air force has a requirement for 250-300 next-generation T-50 fighters to enter use from 2015-16, while India plans to buy between 200 and 250 of the joint design. This should use a common airframe and engines, but have its on-board systems and weapons tailored for their individual needs.
First flown in January, the PAK FA prototype is intended to de-risk features such as the use of low-observable materials and thrust-vectoring engines with supercruise performance, plus internally carried weapons.
Russian sources suggest a pre-production batch of between six and 10 aircraft will be built to support future testing of the type, with the nation's air force expected to launch operational trials in Lipetsk around 2012-13.