Peter Butovsky of the PAK-FA

 

Article renowned expert on Russian foreign aviation P. Butovo in the magazine Air International for 2012 provides current information on the state of the program PAK FA. Note that the author of this article on the topic came in virtually all the world's leading aviation magazines. In this regard, it is not without interest to bring a foreign perspective on the development of the program of creation of the Russian fighter of the 5th generation.

In early February, the head of the holding company Sukhoi Mikhail Pogosyan told Itar-Tass that the prototype fifth-generation fighter PAK FA has made more than 120 flights, the 100th flight took place on November 3, 2011

The most important thing is that the third prototype of the T-50-3 has joined the test flights after the first flight, which took place on November 22 in Komsomolsk-on-Amur. T-50-3 was dismantled and taken to the December 28, Zhukovsky, where all of its systems have been re-installed. He is the first prototype of the PAK FA, which was installed radar with phased N036. On the first two prototypes of the T-50-1 and T-50-2 had only coated metal nose. But for now, the radar on the third prototype includes only the front antenna operating in three-centimeter range.

 

 

 

At the T-50-3 also has two additional sensors enemy radar radiation-101KS Y — one under the bow and aft of the second sub beam. On published to date photos of the T-50-3 that no lateral radiation sensors are likely not installed. Some optical elements elpektronnogo 101KS complex "Atoll" (101KS lens radar system and the system-B anti-101KS D) were set in a prototype-50 T-2, but the first prototype T-50-1 was completely blocked.

 

 

 

 

Three sets of shooting traps HC-50 mounted on the tail boom T-50-3. One is directed downwards, and two upwardly from the plane. It is not known whether equipped with T-50-3 by other internal systems such as coded communication system or electronic jamming.

However, the third prototype differs in two obvious changes. It is a converted air intakes in the grounds of the keels, which serve to cool the motor compartment and for the needs of air conditioning systems, and somewhat different from the first two prototypes of the flaps of the wings. Until mid-February, the T-50-3 Do not fly.

Problems

The first prototypes had difficulty. As reported, in August 2011 the first prototype T-50-1-loaded structural elements of the aircraft were found cracked. The aircraft was prepared for testing at high angles of attack and was equipped with a parachute antispin mounted in the tail boom. Although there was no official confirmation, T-50-1 did not appear to August 2011, and it is believed that part of the flight test program for him over.

The second prototype T-50-2 is currently flies with vertical tail, which apparently belonged to the first prototype T-50-1 (they are labeled 051). The problem with the design of the aircraft were detected in the early stages of testing, when the aircraft has not yet passed the test with large congestion, which shows the need to strengthen the construction of the T-50.

 

 

Recently, M. Pogosyan said, "the fourth plane will take off in 2012," but did not say when it will happen. He seems to be more careful about the timing of the fourth flight of the prototype, compared to last year, when he declared that the flight will take place before the end of 2011

External caution Pogosyan may testify in favor of the assumption that the fourth prototype changes are made upon the occurrence of problems in the T-50-1. It should be noted that the various laths keels visible on the T-50 and T-1-50-2, and now there are 50 to T-3.

Russian Air Force Commander Alexander Zelin remains optimistic. In a statement, RIA "Novosti" in mid-February, he said that by 2015, will be produced 14 copies of the T-50. For the first three prototypes will join three other aircraft, and pre-series cars will be made in 2013-2015.

In accordance with existing plans, in 2013, the T-50 will be transferred to the state tests in Akhtubinsk. GPV-2020 provides for the purchase of 60 PAK FA production in 2016-2020.

The second stage engine "article 30"

Recently, "Saturn" has announced that the full development of the engine, "article 30" for the PAK FA fighter "second stage" officially began in 2011, when it was opened state funding. But in February, the head of the Corporation "Oboronprom" Alexander Reus, which includes the United Engine Corporation, said that the first examples of "article 30" of the second phase will be made in the 2016 engine is being developed in co-operation of all businesses UEC, but the leading role (about 70 %) belongs to the "Saturn".

All three prototype T-50 equipped with engines AL-41F1 (also known as "Article 117"). This engine is a deep modernization of the AL-31FP, which is installed on the Su-30, with a larger diameter fan, the new turbines high and low pressure, improved combustion chamber and new digital engine control, integrated with the system of control of the aircraft.

 

 

According to a press release from the APC in November 2011, issued 16 AL-41F six to ten and ground tests for testing the air on board the Su-27M and T-50 prototype.

 

 

Available AL-41F1 ("Article 117") has a thrust in afterburner 15 and 9.5 tons in besforsazhny mode. It is believed that the new engine, "article 30" has a thrust of 18 and 11.5 tons, respectively, and will be the engine serial PAK FA in 2020.

The patent for the PAK FA

By analyzing the known patent published by the PAK FA, P. Butovsky comes to the following conclusions.

Requirements for the aircraft, which are derived from his scheme, can be arranged in the following order: low ESR maneuverability at high angles of attack, high aerodynamic efficiency at supersonic speeds (which is also preserved at low speeds), a significant load in the internal weapons bay.

Pat implies that the PAK FA has a number of advantages to the Am
erican F-22. Engines are far away from each other, allowing you to get the bulk vnutrifyuzelyazhnyh weapons bay, and the deviation of the nozzle allows the engine to maintain control of the airplane on the vertical and horizontal plane at lower speeds. At the same time, control the rudders on the F-22 is difficult as it motors are located nearby, and / or absence of a "shoulder plane" does not control the plane on these axes.

 

 

 

Air intakes on the T-50 is shorter and elongated than the F-22, helping to reduce the structural weight (but the patent does not indicate that the S-shape of the air intakes of the F-22 is selected to reduce the visibility in the radar range).

 

 

Recently, M. Pogosyan said, "the fourth plane will take off in 2012," but did not say when it will happen. He seems to be more careful about the timing of the fourth flight of the prototype, compared to last year, when he declared that the flight will take place before the end of 2011

External caution Pogosyan may testify in favor of the assumption that the fourth prototype changes are made upon the occurrence of problems in the T-50-1. It should be noted that the various laths keels visible on the T-50 and T-1-50-2, and now there are 50 to T-3.

Russian Air Force Commander Alexander Zelin remains optimistic. In a statement, RIA "Novosti" in mid-February, he said that by 2015, will be produced 14 copies of the T-50. For the first three prototypes will join three other aircraft, and pre-series cars will be made in 2013-2015.

In accordance with existing plans, in 2013, the T-50 will be transferred to the state tests in Akhtubinsk. GPV-2020 provides for the purchase of 60 PAK FA production in 2016-2020.

The second stage engine "article 30"

Recently, "Saturn" has announced that the full development of the engine, "article 30" for the PAK FA fighter "second stage" officially began in 2011, when it was opened state funding. But in February, the head of the Corporation "Oboronprom" Alexander Reus, which includes the United Engine Corporation, said that the first examples of "article 30" of the second phase will be made in the 2016 engine is being developed in co-operation of all businesses UEC, but the leading role (about 70 %) belongs to the "Saturn".

All three prototype T-50 equipped with engines AL-41F1 (also known as "Article 117"). This engine is a deep modernization of the AL-31FP, which is installed on the Su-30, with a larger diameter fan, the new turbines high and low pressure, improved combustion chamber and new digital engine control, integrated with the system of control of the aircraft.

 

 

According to a press release from the APC in November 2011, issued 16 AL-41F six to ten and ground tests for testing the air on board the Su-27M and T-50 prototype.

 

 

Available AL-41F1 ("Article 117") has a thrust in afterburner 15 and 9.5 tons in besforsazhny mode. It is believed that the new engine, "article 30" has a thrust of 18 and 11.5 tons, respectively, and will be the engine serial PAK FA in 2020.

The patent for the PAK FA

By analyzing the known patent published by the PAK FA, P. Butovsky comes to the following conclusions.

Requirements for the aircraft, which are derived from his scheme, can be arranged in the following order: low ESR maneuverability at high angles of attack, high aerodynamic efficiency at supersonic speeds (which is also preserved at low speeds), a significant load in the internal weapons bay.

Pat implies that the PAK FA has a number of advantages to the Am
erican F-22. Engines are far away from each other, allowing you to get the bulk vnutrifyuzelyazhnyh weapons bay, and the deviation of the nozzle allows the engine to maintain control of the airplane on the vertical and horizontal plane at lower speeds. At the same time, control the rudders on the F-22 is difficult as it motors are located nearby, and / or absence of a "shoulder plane" does not control the plane on these axes.

 

 

 

Air intakes on the T-50 is shorter and elongated than the F-22, helping to reduce the structural weight (but the patent does not indicate that the S-shape of the air intakes of the F-22 is selected to reduce the visibility in the radar range).

 

 

 

Unlike the F-22 to T-50 are mounted entirely pivoting vertical tail that is smaller and lighter.

Engines on the T-50 are located at an angle so that in the event of failure of one of them thrust vector will be held near the center of gravity of the aircraft, which begged the control of the airplane. Nozzle engines AL-41F1 deflected up and down in two planes, but deviate from the axis of symmetry of the aircraft in the form of the letter «V», recalls that the installation of engines AL-31FP, the Su-30MKI.

Reducing the ESR is achieved by careful working out of slats of aircraft, the horizontal stabilizer and front deviant plumage. Additional measures to reduce the ESR include cut-side fuselage panels and air intakes, which are chamfered in two planes.

 

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