an OLD BUT SUPERB ARTICLE on
Stealth Rafale, by Thibault Lamidel
It's a real sea serpent Birth Rafale asked a question for the future of the French aviation., And if it was the last hunter national design? Answer yes to this question, it was possible to rule out a hunter fifth generation fighter designed in France.
The fifth generation, how many divisions? One can easily include the F-22 Raptor ... Just like the F-117 and the (mythic) F-35 on the American side. From Russia, the former (?) Grand is not left with the "attempt" to achieving a hunter could be described as the fifth generation. It is the role of the prototype Sukhoi T-50. This will require further confirmation of what this program can do. And the Chinese side, an anonymous reader of this blog reported on an attempt with the "J-XX". There is a "number" of photographs of a device that you stick the name. In the state of knowledge, it is difficult to certify anything ... By cons, remember the "transfer" of Israeli IAI Lavi program to China in the 80's (after the American refusal Israel developed this program). A number of Chinese designs have a close kinship of the transfer unrecognized. It would be interesting to know if Israeli researchers really work on a Chinese stealth fighter ... Just as it is hard not to mention some "black projects" still secret side of Shunk Works Lockheed Martin.
The fifth generation
It follows the very rich fourth generation that understands different levels according to the authors, journals and the passing of time (also called well 4+, 4 ++ or other). The new generation must take precedence over the old with new capabilities. Let's talk kind discussed least: better integration of sensors and data fusion capabilities of network warfare and "super cruise". For the first two abilities, they are not strictly exclusive to the new generation. Hence the diversity of appreciation of what a fourth generation device. The Rafale is a good example of a device of this generation who performs data fusion and makes it difficult its ranking. The super cruise is the ability for a device to cruise at supersonic speed without engaging afterburners. With the F-22 and T-50 that is illustrated by the "heavy" reactors (more than 13 tons of thrust unit, almost double the Rafale). This ability not only mechanics we (me) seems not critical.
If we consider the fifth generation as the culmination of integrated weapons and the rule of electronics that takes over the mechanical systems, the ability to super cruise is rather a reminder of the need for platforms capable to face the air environment and its challenges. And not only used to be an "elevator computer." However, this ability is of course not uninteresting in practice.
Compared to the previous generation, the main change restraint device that belongs to this category is the "stealth". Why talk mainly about that? Above, we said that the rapidly evolving electronic weapons systems was not confined solely to a weapon system. And also just because it is the most spectacular feature. It was she who pushes to redraw the aircraft fuselage. And so, in the collective imagination, that's what best illustrates the passage from one generation to another. Think the difference between a squadron escort, stealth frigate and the first generation Swedish Visby corvette (which would be the second generation).
The Rafale is not stealth originally but "discrete". That is to say, a particular attention has been paid to the design of the cell and its electronic warfare system to reduce its signature and the risks they are detected. But to be stealthy, it should seek to try to virtually disappear (not just reduce) the three main signature of an aircraft:
I)
radar stealth: reducing the "radar cross section" of a device, that is to say, what appears on a radar screen. And discrete or make stealth operation of the weapon system so it does not make the device detectable by its operation;
II)
infrared stealth (reduce the infrared signature left by reactors).
III)
electronic stealth (the weapon system works undetected or participate in the disappearance of the unit by removing the electronic atmosphere).
acoustic discretion will ask one day. For now, the devices which claim the fifth generation tend to have heavy reactors (more than 13 tons of thrust on average). It may be ask the question to make discreet ear too. It is not essential for an airplane
Therefore, the only definition, stand two main axes for r aking (or design) a stealth aircraft:
A) work on the general structure of the device to meet the "laws of stealth";
B) the design of an active cancellation system
Disappear from the electronic atmosphere, is the motto of stealth.
The active cancellation system
It is common to distinguish between devices that attempt the challenge of stealth only by their external form. The result is spectacular because of the unconventional forms it imposes. However, stealth could also be achieved by a system of electronic jamming. Gilles CORLOBE we translated the definition of active cancellation given by Aviation Week :
The active suppression means to prevent a radar to detect a target by sending a signal with the same frequency as the received, but offset precisely one-half the signal wavelength. Result: the energy reaching the radar has no frequency can be detected and
Aviation Week Article goes on to note the (or a) attempts where American engineers have tried to add this asset to the stealth B-2. They are also not only because it is paid here and there attempts to get it to the Russians. And many of the works are French Dassault Aviation and Thales are rented to develop this technique to the point that rumors venture to say that the system would be an integral part of SPECTRA from the F2 standard.
The above article helps reframe the debate by suggesting that the French would be advanced as justifying the funding of a "demonstrator"
The fact that a new demonstration is planned, suggests that the technology may not have been worth the first time [the article refers to the supposed capabilities of SPECTRA in the 90s]. But as the active suppression uses electronics and processing, it could have changed. MBDA and Thales, which absorbed Dassault Electronique and is now responsible for the development of Spectra, have since confirmed they are working on active suppression for missiles
Therefore, the interest if the confirmation came, would be that France could be the tip of a key development of stealth technology. An electronic warfare system has the advantage of allowing some freedom to design a stealth cell. This work by being heavy and expensive kind ... It would be a terrible snub against the American program (F-117, B-2, F-22 and F-35) and Russian (PAK-FA or T-50).
Little comment timeless: military aviation competition point would amount to three players (American, Russian and French)? That would be the consecration of a new hierarchy (it is aimed almost nobody).
But is it possible to bet everything on one electronic aspect stealth, and thus refuse to commit to creating a naturally stealthy cell?
" French government is funding a demonstration of Improved stealth technology for the Dassault Rafale fighter " , says Aviation Week .
Besides, nothing says that will be the " demonstrator "Rafale, or if the demonstration is limited to only e ...
A stealth Rafale with forms?
Therefore, the other for stealth would be to design a fighter so that it meets its requirements cell. It would be almost the need to develop a new device like the F-22 or T-50, assuming that the active cancellation would not give a greater than or equal to a stealth engine advantage. However, it is not necessary to specify that it is almost impossible to develop a new French fighter before a few long years. We will not write one reason out of respect for our readers (the budget!). But if France is developing an intermediate solution in electronic warfare to compensate for the inability to launch a fighter of the fifth generation, will not there be an interim solution to adapt an existing cell program as much as possible?
It is therefore necessary to have one of developments designed for the F-15. The venerable American hunter (including Golden Eagle will remain in service until 2030 as reported by the blog of the legendary aircraft ) was the subject of a study of improved stealth. Under the sweet name of "Silent Eagle", it is about making the F-15 stealth more (or discrete). What are the solutions chosen by Boeing?
Note the missile carriage in tanks in accordance converted into internal bay.
The most spectacular is the new solution using tanks in accordance with the Eagle. These two tanks under the wings of the aircraft are intended primarily to carry extra fuel. If they are told in line is that they are designed to be integrated airframe so that disruptions to a minimum aerodynamic drag of the unit. These tanks are intended as internal bay. So that, in clean configuration, the device has less radar cross section (RCS) by the internal carriage of weapons. This modification of the cell is accompanied by another somewhat less dramatically. Both deviations of Silent Eagle are inclined 15 ° to the outside. In this way the design of the device is similar to that of the Raptor.
Finally, other changes will be closer to what has been done in France. One of them is the use of a radar wave absorbing coating. The Rafale is likely to be painted with a paint having the same role (like Tiger) but French appliance will benefit only for "special occasions." Finally, the latest solutions involve electronics with a new APG-63 radar and electronic warfare system that tend, perhaps, to play the same role as the SPECTRA described above.
So try to apply the American study the Rafale. Work on the SPECTRA and evolution of RBE2 to EASA is already underway. The existence of a stealth paint for the Rafale allows for a starting point towards a stealth coating (expensive, judging by the maintenance of this coating to B-2 and F-22).
This leaves the issue of structural changes. The vertical stabilizer of the Rafale might be hamper the search for stealth. But it is a reportable element of the cell. So, it is conceivable to find a way to turn this drift without causing structural modification impossible.
Note the hump in the back of the cockpit, midway between the junction of the wing and the back of the Rafale.
And how to get a smooth configuration of the Rafale with internal weapons carriage? The Rafale has seen him grow to the study of two dorsal tanks compliant. Is it fatal? It is possible that not, some aircraft saw the capacity study of missile hanging from their backs, such as the revaluation of Jaguar to India. It may be conceivable, therefore, do the same job but on Boeing CFT [Conformal Fuel Tanks] dorsal Rafale. The solution may seem dramatic, but it would not be more than for the Silent Eagle. In reality, it is the unconventional side that will surprise. Moreover, to return to more conventional, it would not be unreasonable to propose the creation of a ventral CFT.
Trimming the proposals to close
The sum of the proposals in its technical aspects, is to retain the active cancellation capabilities developed in France and coupling with increased job discretion on the cell for the Rafale. It is therefore tried to approach by stealth two solutions that can be qualified intermediaries (recalling the active cancellation seems to be a technological challenge). The interest in creating a prototype stealth Rafale is technique.
It will not be hard to say that the Air Force (and Navy) are not a priority to form a squadron or two fleets with a stealth version Rafale. Therefore it will be proper to be proved that this stealth Rafale would be more expensive than Rafale base. Indeed, the cost of developing the SPECTRA and stealth paint are already committed. Be doubted that the integration of various solutions is disproportionately expensive compared to a conventional version of the Rafale. The evolution of the Silent Eagle will be decisive for the future of this kind of middle ground. These two devices are, in a way, an attempt to achieve stealth cheaply.
But it is also a political gamble. Only the United States and Russia have now developed the so-called fifth generation aircraft (for stealth). If France, even symbolically, joined this elite club, she would draw a distinct political advantage.
In addition, for the existence of French military aviation industry would be a flagship flamboyant. And allow France to support its policy of arming the symbolism of belonging to large. So upset the world rankings as the Russians did with the T-50 ... and the Chinese who could spring a surprise with the J-XX program when they are requested to reveal the state of their abilities in the world ...
And expansion to the sixth generation
Faced with the difficulties of the fifth generation, the United States will not waste their time and are already talking about a "sixth generation". This is what seriously tells Joseph Henrotin in this article . There is talk of pushing more logic reign of electronics in this generation. But the distinction with the "back" is not obvious as shown by the author. And we invite you to read also views as grave site defensa.org which chronicles the case of the sixth generation with a touch of humor.
Mon Blog Défense: Le Rafale furtif, par Thibault Lamidel