J20 Stealth Fighter

lixun

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The J-11B was delivered to use in June 2007 and formed full combat capabilities in 2013. . Just as Xiao Jun, a brigade commander of the Central Theater Air Force Aviation Corps, who just completed the restructuring of the J-11A to the J-11B in 2015 and took down two "golden helmets" in 2016, said when evaluating the J-11B: "You are old when you are young." This is a pity for modern heavy fighters that frequently require 30-40 years of service life.
 

lixun

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The J-11B adopts a mechanical scanning radar equivalent to that of the J-10 fighter, and its technical level seems a bit low today.Since the Air Force did not require ground attack capabilities, the J-11B’s fire control system did not integrate precision-guided munitions. In the era of the PLA’s later development of precision-guided ground weapons, the J-11B could only launch rockets and unguided bombs. , Looks quite embarrassing
In the era of the development of the J-11B, the Chinese Air Force has put forward the idea of an offensive air force of "both offensive and defensive, and use me in the first battle." Air combat is of course an important part of offense and defense, but it is not the only part.

In the development of the basic Su-27, it was influenced by the respective duties of the Soviet Air Defense Air Force and the Frontline Air Force, and also due to the fact that the U.S. Air Force’s "one pound is not used for air-to-ground" in the development of the F-15 and the Soviet aviation technology level As a result, the basic Su-27 only has a very rudimentary ground attack capability. Basically, it can only use unguided rockets and iron bombs to approach weak opponents who lack advanced air defense capabilities. In actual combat, whether such an adversary is worth attacking with high-cost advanced fighter jets such as the Su-27 is a question.

But this is not a problem for the Soviet air force. A large number of Su-17/22 and Su-24 are more suitable for ground attack. First of all, the air defense air force equipped with Su-27 does not undertake ground attack tasks at all. In the development of the second and third generation Su-27, even for Russia, the technical basis has already deviated, emphasizing the increase in ground attack capabilities.

But the Chinese Air Force was different from the beginning. The Chinese Air Force lacks an effective ground attack platform, especially a combat attack platform with a long range, a large amount of ammunition, and a self-escorting capability. The H-6 has a long range and a large amount of ammunition, but it lacks the ability to self-escort. Qiang-5 has limited self-escort capability, but its range and ammunition capacity are low.

Therefore, in the 1990s shortly after the introduction of the Su-27, the Chinese Air Force used the Su-27 to perform ground attack missions during exercises along the southeast coast. Although it could only launch unguided rockets, it became a topic of ridicule in Taiwan. However, in the specific environment at that time, it was only Su-27 to take off from a relatively safe inland base and have enough space time and ammunition on the other side of the Taiwan Strait, and the Q-5 was a bit reluctant to use.
 

lixun

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Technically, the development era of the J-11B is already an era of digital avionics and multi-tasking of tactical aircraft. The F-15's "a pound is not used for air-to-ground" era background has two aspects: 1. The unsuccessful example of F-111 makes people talk about multi-purpose use, and the special use of air combat helps to reduce the technology in research and development. Risks; 2. Avionics technology limitations make air-to-air and air-to-ground need special systems.

However, the third-generation fighter's high thrust-to-weight ratio and low wing load provide a large amount of residual lift, making air combat fighters naturally suitable for conversion to fighter-bombers with low mobility requirements. On the other hand, the development of electronic technology allows avionics to easily meet the requirements of air-to-air and air-to-ground. In the early days, it was necessary to switch modes from the ground to the ground. Later, it was developed to be able to switch in real time by the pilot in the air. The American F-18 classic was the first to successfully achieve multi-tasking, so the official number of the F-18 is F/A-18, highlighting its dual-purpose characteristics. The F-15, which "a pound is not used for air-to-ground", developed the successful F-15E, although the US Air Force is still ashamed to call it F/A-15E.

However, the development of the J-11B still followed the design concept of the Su-27 basic pure air combat, ignoring China’s actual technical conditions and the reality of changes in the Air Force’s thinking, making the J-11B incorrectly positioned in the design, resulting in uncorrectable shortcomings.
During the development of the J-11B, the People’s Liberation Army Air Force may think that the Su-30MKK fighter jet combined with a large number of purchased and imitated Kh-29 missiles is sufficient to meet the needs of our army for precision strikes. There is no requirement for the J-11B to have strong precision strike capabilities.

In contrast, in addition to localization and partial replacement, the J-11 continues to use the Su-27's simulated flight control and unreinforced airframe. The simplest fly-by-wire flight control just uses electrical signals to transmit the pilot's maneuvering actions. But in signal transmission, automatic realization of a certain linkage and adding stability, this is the meaning of fly-by-wire flight control.

The analog flight control is realized by using an analog circuit with an operational amplifier as the core. The system is relatively simple and has a fast response speed, but the functional complexity is difficult to improve. The circuit has inherent drift and failure rate problems of the analog circuit. It has used old-fashioned electronic tubes or transistor radios. People will experience this. The tuned radio station needs to be fine-tuned with the knob every day, otherwise nothing moves and it may be off the stage. The analog flight control is more difficult to upgrade, just like a tube radio must be connected to a recorder, unless the jack is reserved, it can only be replaced entirely.

The simplest digital flight control is to simply digitize the analog flight control. However, the vitality of digital flight control lies in the integration of advanced functions. It not only automatically analyzes and filters the pilot’s excessive maneuvering actions, but also automatically compensates for changes in weight and center of gravity caused by fuel and ammunition consumption. It can also be cross-linked with the engine and fire control for implementation. Feihuo push integrated control, in the ever-changing battle, free the pilot from complex, cumbersome, and delicate operations, and become a tactician instead of just an operator. The digital architecture also provides a system self-check function, real-time monitoring of the system status, not only prompts when a failure occurs, but can even automatically reorganize, and restore the main functions through part-time jobs in other systems. The digital architecture can even be upgraded through software, just as a smart phone can be upgraded through downloading, or even new features can be added.

The digital architecture is also easy to implement an open structure. Using a PC as an analogy means that you are no longer stuck with specific CPUs, graphics cards, memory, and hard drives. As long as they meet the architectural standards, they can be directly replaced. This is not only the convenience of maintenance and upgrading, but also encourages the introduction of new technologies. In a sense, the IBM PC quickly defeated the Mac, which had already "occupied" the market, thanks to the open architecture. F-22 is the first to use open architecture on fighter aircraft. F-35 represents the highest level of open architecture. To a large extent, it is the main reason why F-35 has become a "soft fighter", making F-35 unlimited in the future. Upgrade potential. This also represents an important direction for the development of fighter jets in the future. "Hard performance" is no longer the only factor that determines combat effectiveness.
 

lixun

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The J-11B also did not move the infrared photoelectric search and tracking system (IRST) in front of the cockpit to the right side like the J-15, leaving room for the aerial refueling probe to be suitable for patrols in the open sea (such as around Taiwan or Nansha). The J-10A already has the ability to refuel in the air.

The premature decline of the J-11B was caused by its low positioning, and Shen Fei has a hard-to-shirk responsibility.

Of course, not all responsibility lies with Shen Fei, and the Air Force is also responsible. For the Air Force, the old thinking that only cares about the near and not far away must also keep pace with the times. The beginning of the 21st century is an era when China's national defense situation is very severe. It is natural for the Air Force to urgently require new fighters to enter service as soon as possible. However, the Chinese military (not just the Air Force) has entered service with a large number of modern high-performance, high-cost equipment, and still has not jumped out of the old mentality of treating military products as consumables for short-term use. Only by winning the battle can the soldiers be defeated without fighting. Therefore, the issue of war attrition must be considered. But long-term peace depends on the sustainability of military modernization, which requires high-quality, high-durability, and high-upgradability equipment, rather than "use and throw away." This needs to be balanced.
In the development of the J-16, both the military and Shen Fei have made great progress in the guiding ideology, and no longer developed the "short, flat and fast" route of the J-11BS+JH7A avionics.
 

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In contrast, the J-16 did not simply combine the J-11BS platform with the JH-7’s fire control and external management, and took the old path of short, flat and fast but too low positioning. The J-11D can be regarded as a single-seat JH-7. -16. This is a huge improvement. Compared with the J-11B, 80% of the body structure of the J-16 has been changed or redesigned, and 90% of the system has been improved or completely new. For the first time, imageless manufacturing technology has been applied.

More importantly, the J-16 has a digital integrated fire control and advanced electronic warfare system centered on the domestic active electronic scanning radar, and it realizes integrated control of flying fire and propulsion around the new generation of digital flight control and the improved "Taihang" engine. Improved flight performance and mission effectiveness. It is said that the overall performance is close to that of F-15K/SG. This is the ultimate mass-produced version of F-15E. The US Air Force’s "Eagle 2040" was also developed on this basis. In other words, in accordance with the expectations of the U.S. Air Force, this standard F-15 fighter will still be the first-line main fighter in 2040.
The rigidity of partial components replaced with composite materials is to maintain similar structural elasticity. The problem is that the rigidity of the partial components themselves only solves the structural elasticity problem at the component level, but the components are to be installed on a larger structure. The weight of the "hang-on" components is reduced, which will inevitably affect the overall structure. And damping. The more highly optimized the basic structure is for weight reduction, the more sensitive it is to such weight changes. It is very unreasonable for Shen Fei to trip over such a low-level mistake, but it is also the inevitable result of seeing the trees but not the woods caused by dogmatic and mechanical "understanding". Shenyang finally saw the woods. The overall structural optimization is an important driving force for the J-16 to no longer be limited to partial reinforcement and weight reduction, but to a comprehensive redesign.
 

MiG-29SMT

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So how do they reduce the RCS of that behemoth?
Electromagnetic waves can be absorbed, reflected or diffracted, basically the Canards act as any other surface, most of stealth treatment is reflection and it is based upon the angle of reflection.

Problem is more number of surfaces mean more electromagnetic waves will be reflected or captured, if they move they will damage planform alignment.

Thus J-20 is detectable, because anything will reflect, absorb and diffract electromagnetic waves, stealth it is mostly by reflection send the wave to a different direction from the radar so it does not send it back to the emmiter.
1623569134722.png

The radar thus needs a much higher power density and computing power and use the frequency to help locate the target.
1623569253290.png
 
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lixun

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easy electricity exists where atoms exist, thus as long as J-20 has atoms those atoms react with electricity and magnetism.

View attachment 94470
J20's canards are fully movable canards. The canards will reverse when taxiing on the ground and act as a speed brake. The canards will be parallel to the main wing during flight. The only paper on the stealth performance of the J20 is this one from Australia
 

MiG-29SMT

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J20's canards are fully movable canards. The canards will reverse when taxiing on the ground and act as a speed brake. The canards will be parallel to the main wing during flight. The only paper on the stealth performance of the J20 is this one from Australia
no it is not the only paper, Canards will move since they are pitch control, not moving is fantasy, they are tail first, all canards move like all elevons, the problem of J-20 is its canards are not align with the intake walls or vertical tails, thus they have a different angle, does not matter it is Rafale or Eurofighter, canards do move
 

MiG-29SMT

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The canard of J20 is like the bulge under the belly of F35. Stealth is a very complicated problem. RCS value cannot be measured with eyes.
The F-35 is having trouble, even F-22, the F-22 will be phased out in 2030 and F-35 is being replaced by F-15EX.


Stealth is propaganda, any material has atoms, atoms do have electrons and current, electromagnetic waves interact with any material, as such stealth is radar cross section optimization for some distances, type of radars and directions.

J-20 is detectable, for some radars less detectable than J-10, but for others both are very visible
 

lixun

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no it is not the only paper, Canards will move since they are pitch control, not moving is fantasy, they are tail first, all canards move like all elevons, the problem of J-20 is its canards are not align with the intake walls or vertical tails, thus they have a different angle, does not matter it is Rafale or Eurofighter, canards do move
v2-00bf30f51e8240aef9eb523f401feef8_1440w.jpg
v2-0a572a78beee7a44fc6078c4ee563d7c_1440w.jpg
v2-9c6ac977eddb9238d9b621152f3f0af6_1440w.jpg
 

lixun

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The F-35 is having trouble, even F-22, the F-22 will be phased out in 2030 and F-35 is being replaced by F-15EX.


Stealth is propaganda, any material has atoms, atoms do have electrons and current, electromagnetic waves interact with any material, as such stealth is radar cross section optimization for some distances, type of radars and directions.

J-20 is detectable, for some radars less detectable than J-10, but for others both are very visible
In principle, what you said is correct, but various methods can be used to minimize the impact.
Known now
1. Flat tail cut tip treatment
2 Application of wave-transmitting materials
3. Edge absorbing treatment
4. Blocking between the canard and the body
 

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