After writing down these design requirements verbatim from Yang Weiping in the flight place, Simonov and Ivanov suddenly became extremely excited.

Yang Weiping, the head of state, deserves to be the father of the Su-27!

His idea of upgrading the Su-27 is really more forward-looking than the two of them.

"Yang, if the lift of the aerodynamic layout of the three wing surfaces is guaranteed on the premise of increasing the weight of the fuselage, then the original wing leading edge extension must be increased, and the front wing that can be manipulated separately should be installed on its side. Simonov thoughtfully came up with his design ideas.

"That's a must!" Yang Weiping gave Simonov an appreciative look and said with a smile: "I have been similar to it in professional aircraft design software, which can adjust the leading edge sweep angle to 53.5 degrees, the wingspan is 6.43 meters, the area is about 3 square meters, and the deflection angle is +3.5 to -51.5 degrees, which is driven by the hydraulic device in the edge strip of the front edge of the wing root."

This design is equivalent to increasing the wing area in the front section, which, together with the vortices generated by the front wing and the excellent high angle of attack control, increases the total lift, while also shifting the center of lift forward, making the aircraft more agile and less drag when transitioning.

The stronger vortex flowing through the wing root increases the lift there, so the wing root load is lower under the same total lift conditions as the Su-27. This means that the same structural strength can withstand a higher G value, plus the structural strength of the J-18 is stronger than that of the J-15, so the normal operating limit is more than 1G more than the J-15, reaching 9.5 to 10.5G!"

If the J-18 of the Eastern Union Union can be successfully developed, it will definitely be the first advanced fighter in the world today with a normal limit of 10G!

Simonov secretly felt ruthless in his heart, since the Eastern Union can develop the J-18 on the basis of the Su-27, the great Soviet Union will definitely be able to design the best fighter on the Su-27 platform that is not weaker than the Eastern Union J-18!

As the best aeronautical design master in the Soviet Union, Simonov keenly found that the front wing design that Yang Weiping just mentioned was one of the two keys to greatly improving the sports performance of the J-18.

Another key is the flight control system. OUCC has the world's best flight control system, which Simonov has been eager to obtain. For this reason, Simonov wrote an application report to the Supreme Presidium of the Soviet Union on more than one occasion, saying that the Soviet Union must carry out all-round cooperation with OUCC in the field of avionics and flight control system research and development.

Yang Weiping's front wing design just now, its many advantages mainly come from the effect of the front wing vortex to delay stalling. This action increases the stall angle of attack, that is, the angle of attack that maximizes the lift coefficient. In addition, the front wing is close to the main wing, which has a close coupling effect with the main wing, so the slope of the lift coefficient curve is increased. That is, the lift coefficient is increased at the same angle of attack.

It is precisely because these two effects work together to improve the lift performance of the J-18 that adjusting the nose vortex can enhance the stability of the high angle of attack and increase the usable angle of attack, and even undescend the spiral. As long as there are proper flight control commands, the forewings can provide this service.

However, Simonov is still skeptical about whether OUCC is really capable of developing an extremely complex flight control software and the corresponding flight control computer system.

One of the main reasons why Simonowu believes that Yang Weiping's idea of the J-18 is not a fantasy is that he knows that the fourth-generation high-thrust and thrust-to-weight ratio vector turbofan engine WS15-TG-400 of OUCC has entered the stage of industrial mass production.

OUCC's WS15 began to enter mass manufacturing, which means that the comprehensive performance and parameters of WS15 have met the design requirements of the fourth-generation military turbofan in all aspects, and several prototypes must have been built as the power plant of the J-18 verification aircraft.

Thus. In the field of research and development of advanced fighters, the Soviet Union is indeed a long way behind the Eastern Union.

If the Sukhoi Design Bureau wants to design an excellent multi-role fighter, the first key is undoubtedly whether the Rurika Design Bureau can provide turbofan engines with greater thrust.

At the warm invitation of Simonov and Ivanov, Yang Weiping next visited the Saturn Scientific Research and Production Complex in the Soviet Union.

Yuri Yeliseyev, general manager of the Saturn Scientific Research and Production Complex, Yefugeny Martyuskov, deputy director and chief designer of the Science and Technology Center, and Chepzhen, deputy chief designer, made a special trip to welcome the visit of Yang Weiping.

Out of respect, Martyukov and Chepzin even invited Yang Weiping to the development site of their just-launched AL-41 engine.

At the enthusiastic request of Martyukov, Chepzhin, Simonov. Yang Weiping made comments at the AL-41 engine research and development site.

"Actually, internationally on the fourth generation of engines. That is, there is no clear definition of what you call a fifth-generation engine. Typically, gas turbines are based on their primary performance. For example, the unit weight, that is, the ratio of the weight of the generator to the thrust.

The index system of your third-generation engine AL-31F is about 0.12, so the index of this AL-41 should reach 0.1, that is, one kilogram of engine can produce 10 kilograms of thrust. In addition, the gas temperature of the fourth-generation engine must reach more than 2000K. And from the point of view of economic use, it is more important to have a lower life cycle cost, which means that the production cost of the engine should be relatively cheap.

If the Su-27 runs at $10,000 per hour, then the newly developed fourth-generation aircraft must be reduced to $1,500 per hour. Otherwise. Even if the thrust, structure and radar stealth performance design meet the standards, the fourth-generation aircraft manufactured cannot be used because the cost is too high, or it cannot be sold, it can only show that this fourth-generation aircraft has no practical value. ”

"Führer Yang, can your newly developed WS15 be able to achieve this standard?" asked Yelisheyev, the general manager of the Saturn Company, with a green light in his eyes.

"This is a must!" Yang Weiping waved his hand categorically without hesitation and said: "Our J-15 operating cost is controlled at about 7,500 US dollars per hour, WS15 is better than WS10 in addition to comprehensive performance, and its production type has completed the acceleration task." It seems that the 15-year service period will be compressed into 4 years for trial evaluation.

The aircraft has been in operation for 1,800 hours and has completed 9,158 total cumulative cycles (TAC), marking the first and first fourth-generation engine to verify its ability to meet life-cycle requirements. The WS15 engine has accumulated more than 300,000 hours so far.

This milestone marks a significant achievement for the engine of the world's only fourth-generation advanced fighter under development today, validating the maturity of this advanced propulsion system. This is an indisputable testament to the excellent durability and reliability of the WS15 engine and its components!"

If these words were said by any one else, Yelisheyev, Martyukov, Chepzhin, Simonov and others guaranteed that no one would believe it.

However, these words came from the mouth of Yang Weiping, and these top aviation power designers and aircraft designers in the Soviet Union could not believe it.

If you compare the AL-41, which was established in 1981, with the WS15 of others, one is still a three-year-old child, and the other is a man in the prime of life.

Yang Weiping certainly knew that if it were not for his intervention, the initial mature product of the Saturn AL-41 would not have been until at least April 2001 when the Rurika Design Bureau built 26 AL-41F engines for multifunctional front-line fighters (MFI), mainly for ground and flight tests. Counting the former Soviet Union, the research and development project of AL-41F has invested a total of 1.5 billion US dollars.

Perhaps, it is appropriate to point out these Soviet scientific and technological elites in front of them, so that the Rurika Design Bureau will take fewer detours in the design process of the AL-41F. Wait until the collapse of the Soviet Union in the future to pick this fruitful fruit for the use of the Eastern Union Union.

After all, on the AL-41 engine, the Soviet Union adopted new structural materials, such as ceramics and cermets, and also adopted a new thrust controllable scheme, changed the cycle parameters, used high-load turbines and compressor blades, and strengthened the single crystal structure through guò fiber carburizing. These technologies are undoubtedly cutting-edge technologies with great value.

In addition, as an alternative to the AL-41F, the R179-300 engine with a thrust of 20 tons developed by the Moscow Union Aero-Engine Scientific and Technical Group also has great research value. In the 90s, because the budget was not fully in place, the LFS and 117 projects became a piece of paper, which are all good things with great research value.

If this cooperation is carried out, more aero-engine technology from the Soviet Union can be absorbed to enrich the aero-engine research work of OUC, which will definitely be beneficial and harmless for OUC.

As for the T-50 designed by the Sukhoi Design Bureau in the future, Yang Weiping has no plans to throw it all out for the time being. Because now with the Su-35 Super Flanker, it is enough for the Soviet aviation scientific research units to seriously digest it for at least five years.

And in Yang Weiping's heart, the J-15 does have a lot of room for upgrading, as long as OUCC has a further breakthrough in the field of new materials research, then based on the Su-27 platform to design a fourth-generation advanced fighter with real practical value, that is, the T-50 enhanced version, should not be a big problem.

Sometimes, Yang Weiping is genuinely envious, jealous and hateful of the large number of scientific and technological talents that the Soviet Union has. If it had not been for political reasons, the Soviet Union would have been able to compete with germanium in semiconductor research and go the same way, with the Soviet Union's scientific and technological talents and industrial base, it would definitely not have lagged behind Western countries in electronics.

In a cordial and friendly atmosphere, Yang Weiping held an on-site symposium with a group of elite backbones of the Saturn Scientific Research Consortium.

Yang Weiping reserved some of his experiences with the AL-31F engine, and the core engine if this engine was upgraded, with Soviet experts. It received unanimous praise and praise from all Soviet experts on the scene. (To be continued......)