The military-industrial scientific research system of the academic master

The plan proposed by 601 does seem a bit strange at first glance.

However, the people at the scene were all experts who were very familiar with the layout of the aircraft wing, and they quickly responded.

"Semi-tailless layout?"

There was a buzz of discussion in the venue.

Even Chang Haonan, who thought he had expected it, had a somewhat surprised expression on his face.

The so-called semi-tailless layout is generally understood to combine the horizontal tail and vertical tail of the aircraft into one, and use a set of large-angle V-shaped airfoils to simultaneously function as pitch/heading control and stabilizer.

The most typical representative among them is of course the YF23 fighter jet that once competed with the YF22 in an ATF bid, but ultimately lost because the plan was too radical.

However, perhaps because of lessons learned from Nopoulos Grumman, although the design scheme on the screen adopts a semi-tailless layout, other design features are not as radical as the YF23.

Generally speaking, it still has the conventional shape of air intakes on both sides, diamond-shaped upper monoplane, full-span leading edge flaps, trailing edge outboard ailerons and inboard flaperons.

It’s just that the distance between the two engines is significantly larger than the canard plan of the 611th Institute, causing the two magazines to change from a parallel layout to a tandem layout.

And, although there is no scale bar, it is still not difficult to see that the axial dimension of this solution is shorter and the spanwise dimension is increased, so it also appears more substantial.

Fortunately, the height of the fuselage is still under control, and it does not become an uncoordinated fat duck shape like the F35.

Several representatives from Institute 601 had obviously expected that this plan would have a certain impact on the scene, so they did not start introducing it immediately, but set aside some time to provide a buffer for others.

After a few minutes, the scene gradually calmed down again.

The attention of many participants also focused on the seats of representatives of House 601.

"As Comrade Yang said just now, if you just follow the technical ideas of the F22, you will not be able to truly obtain a product that surpasses its performance."

As soon as Sun Cong opened his mouth, he responded with tit for tat, directly starting with what the other party said:

"From a technical principle, the airfoil not only provides the basis for aircraft flight, but also increases the aerodynamic resistance and radar reflection area. The interaction between different airfoils is also the focus and difficulty in the field of aircraft stealth design. , so we tried to reduce the number and area of ​​the airfoil without affecting lift and control capabilities, and finally came up with this technical solution using a semi-tailless layout. "

"As for the layout itself, I think everyone here should be familiar with it. In addition to the most typical YF23 scheme, the X32 demonstrator launched by Boeing in the JSF project is technically a tailless delta wing with twin vertical tails. The conventional layout, but the idea of ​​improving stealth performance by reducing the number of airfoils is consistent..."

"Although our country has not officially put into service a semi-tailless aircraft in the past, we have gained certain design experience through research on the 'Dark Sword' UAV concept aircraft and have conducted many rounds of control logic for this layout. Ground testing..."

"..."

Although Sun Cong's introduction was also quite exciting, Chang Haonan could easily tell that the atmosphere seemed to be more in favor of the previous 611 Institute's plan.

After all, the plans proposed by both sides are not conventional, and they have very high requirements for wing surface relationship and flight control.

But the 611 Research Institute has already verified the feasibility of the canard + delta wing layout on the J-10, and now it has come up with a second similar plan, which can be regarded as familiar.

In comparison, the semi-tailless layout of Institute 601 seems a bit shaky.

Of course, you can say that when the J-10 was built, the risks faced by that plan were no less than today’s semi-tailless layout.

But times have changed after all.

In 2005, China had passed the stage where it had to take risks and do triple jumps to catch up with the world's leading level.

Seeking stability on the basis of targeted design is the choice that most people are more willing to see.

However, Sun Cong, who was making an impassioned speech, could not just die down.

Radical solutions will naturally lead to radical performance.

After a short pause, he flipped the PPT on his computer to the next section:

"I have read the report made by comrades in the Air Force last month. Although the bi-base radar detected signs of the opponent's stealth fighter very early, allowing commanders to prepare in the right direction in advance, the specific details of the F22 that were actually captured were The position is still to seize the opportunity of the opponent to pull up at a high angle and prepare to face our interceptor. "

“According to our calculations and simulation tests, after reducing a set of airfoils, although it will not have a significant impact on the minimum RCS value on paper directly ahead, it can reduce the RCS value from the 60° direction up and down the front hemisphere by 40 %, significantly improving the probability of the aircraft being detected during turning, climbing or diving, and improving the tactical flexibility of the stealth aircraft during use. "

"One thing I would like to draw your attention to is that although the Chinese Air Force still focuses on homeland air defense missions, the People's Army still has historical missions to complete. The new generation of main battle equipment should gradually abandon the purely defensive operational thinking and begin to consider The operational environment likely to be faced during an offensive mission..."

“Furthermore, in addition to better stealth capabilities, this half-tailless layout also provides a greater magazine depth, allowing the aircraft to carry air-to-surface weapons with larger diameters while maintaining stealth without the need for Specializing in the development of small-yield, small-size ammunition like SDB is also one of the original intentions of the US military in developing JSF fighter jets..."

This statement actually brought back the balance that had been severely tilted just now.

In particular, the part about "the unfulfilled historical mission of the people's army..." directly hit the hearts of several military representatives.

The sound of discussion once again filled the venue.

Lu Guang, who frowned, lowered his head and thought for a while, then turned to look at Li Jianqiang, who had never expressed his position before:

"Lao Li, what do you think...if a long-range warning radar like the AN/FPS-115 is used to perform anti-stealth operations, what is its approximate effect?"

Although Lu Guang is the head of the Air Force Equipment Research Institute, his main expertise is in the aviation field.

As for air defense and anti-missile defense, the latter is more professional.

Li Jianqiang was stunned after hearing this:

"You mean pavement claw?"

But before Lu Guang could answer, he quickly understood the meaning of the other party's question——

Since Sun Cong has just mentioned topics related to offensive missions, it is natural to take into account the air defense equipment of the main imaginary enemy in the future.

Air defense systems like Hawk or Sky Bow are not something to be afraid of, but if the two paving claws are really built and put into use, they still have to be respected to some extent.

"Our country currently does not have similar equipment, so I can't draw a direct conclusion..."

After Li Jianqiang thought for a moment, he first made a disclaimer, and then replied:

"The Paving Claw was originally designed for high-precision anti-missile warning, so the array elevation angle is very large, which is not conducive to observing aerodynamic targets flying at long-range, medium and low altitudes."

"Of course, after all, this radar has a theoretical detection range of more than 5,000 kilometers for a 10-square-meter RCS target, and it uses the UHF band, which is not the comfort zone of stealth aircraft... So even if the above disadvantages are taken into account, low-altitude penetration is not considered Or under the premise of electromagnetic interference, the threat to general stealth targets cannot be underestimated. "

Just when several people around him thought this was the final conclusion, he suddenly changed the subject:

"But having said that... the pavement claw is a fixed target after all. Even if the Air Force can't handle it, there are still ballistic missiles from the Second Artillery Corps after all... And don't forget, Dean Lu, our focus on future combat scenarios is not How to seize the target, but how to conduct area denial..."

This answer can be regarded as pulling Lu Guang back from being led astray.

What the aviation force currently needs is a fourth-generation aircraft that can form combat effectiveness as soon as possible to compete with the F22 and the larger number of F35s in the future.

After settling on this idea, it is not difficult to analyze that the plan of the 611 Institute is currently the most suitable.

Even if there are other solutions such as three-wing or conventional layout, it will be difficult to be more advantageous than the canard+delta wing layout.

At the same time, the aviation industry has also begun to pay attention to some specific technical issues of the semi-tailless layout...

"Academician Chang, the semi-tailless layout needs to be combined with thrust vector technology to achieve controllability and maneuverability comparable to other airfoil layouts. What is the research status of the Aerodynamics Group in this area?"

As expected, someone soon took the initiative to bring the topic to Chang Haonan.

To be honest, Chang Haonan himself is really interested in this semi-tailless layout.

But interest is interest, and he cannot affect the fairness of the results simply because of his personal likes and dislikes.

"Our group is conducting ground control testing of a vector nozzle on a turbofan 10 engine, and it is expected to enter the flight verification stage next year at the latest..."

Chang Haonan first briefly mentioned his own research and development progress:

"However, the semi-tailless layout requires omnidirectional thrust vectoring technology. The structure of this vector nozzle is very complex, and its service life will be much shorter than the engine itself... Of course, under normal circumstances, the vector nozzle takes effect for a very short time. So it’s acceptable, but if thrust vector is to be frequently involved in flight control, this issue must be considered..."

Aircraft research and development, in the final analysis, is inseparable from power.

Therefore, Chang Haonan's words set the tone for the entire seminar to a certain extent.

Combined with the opinions of the aviation force, anyone with a discerning eye can basically see that 611 should have the last laugh.

It's just that the level of this meeting is not high enough to make a formal decision...