"Okay, Grandpa Su, in fact, I still have to tell you that my secrecy level is not B9, but A1. The secrecy level of the troops is also A1. Hearing Su Feng's words, Luo Hai shook his head: "So, you understand." ”

“A1！” When Su Feng heard Luo Hai's words, he was immediately extremely surprised, and then his face was stern, and he couldn't help but nod.

Level A1, which is already higher than the B10 secrecy level for ministerial-level officials, is at a highly top-secret level and level.

Although Su Feng was extremely curious, when it came to the news that his level of secrecy was not enough, he suppressed the curiosity in his heart well and did not inquire.

"Grandpa Su, hehe, I still have some questions here."

After telling Su Feng about it, Luo Hai immediately smiled and told all the problems he had found and collected since the flight during this time, as well as the problems when studying aerodynamics and the aerodynamic layout of the aircraft.

It is simply rare to be able to find Su Feng, an expert in both aerodynamics and aero engines.

"Good boy."

When Su Feng heard Luo Hai's question, he couldn't help but smile and nodded, the question Luo Hai asked required deep professional knowledge and rich experience, and after complicated practice, he could only be perceived.

An ace pilot, and at the same time a student specializing in aerodynamic layout, aerodynamics and aero engines, such a genius really made Su Feng sigh.

Luo Hai brought up all the problems he encountered, and after getting Su Feng's answers, he quickly recorded these explanations, and after all the problems were solved, Luo Hai thanked Su Feng respectfully: "So that's the case, Grandpa Su, thank you." ”

"Xiaohai, I'll show you something."

After solving all of Luo Hai's problems, a layer of fine sweat broke out on Su Feng's forehead, smiled slightly, and then took out a book without a cover from his backpack.

Like!

Su Feng really likes the pilot he met around him.

Therefore, Su Feng also showed Luo Hai the treasures he had accumulated.

Luo Hai nodded, looking at the book without a cover in Su Feng's hand with expectant eyes.

Sitting up straight, Su Feng smiled at Luo Hai, then opened the treasure that he carefully treasured and refused to take out, and turned the first page of the white page full of wrinkles, revealing the mystery in it.

"It's!" Luo Hai looked at the content of the first page, his eyes suddenly widened, and he couldn't help but be surprised.

The first page of the book is not a text, but an image, a fighter plane resting quietly on the white pages.

Single-seater twin launch bureaus, highly similar to the aerodynamic layout shape of the F-22, streamlined body, full of science fiction flavor, this is the fighter marked as the J-12 'fang'.

"This is when we were idle and had nothing to do, the big guys designed the fighter together, stealth design, increased high-speed circulation, and had very high maneuverability. Equipped with a concept that had just appeared at that time, a vector turbofan engine, a maximum flight speed of Mach 2.5, an overcruise time of 2 hours, and a ceiling of 25,000 meters, everyone named it J-12 Fang, which is different from the previous J-12. ”

The old hand quietly stroked the J-12 'Fang' stealth fighter on the page, Su Feng smiled slightly on his face, and said to Luo Hai.

"It's advanced." Looking at the performance of the J-12 'Fang' stealth fighter and the situation of the entire fighter, Luo Hai couldn't help but sigh.

Su Feng smiled, and then turned another page, the second page is also a fighter, but it is different from any current active fighter, it uses a forward-swept wing aerodynamic layout!

Forward-swept wing super-maneuverable fighter - J-13 'Jimmer'!

"This J-13 'Jairs' forward-swept wing fighter, when we were engaged in the No. 10 project, everyone was happy to play, regardless of reality, using a forward-swept wing wing, swept 22 °, instantaneous circling angular speed of about 68 ° per second, maximum speed of Mach 2.8, maximum ceiling of 28,000 meters, single-seat twin engines, two vector turbofan engines with a total thrust of 300 kN, and a range of 5,000 kilometers."

Su Feng looked at the J-13 'J&13' forward-swept wing fighter on the second page, a smile appeared on his face, and he continued to explain the number of jù for Luo Hai.

"Forward-swept wings, which are very good wing types. It has almost no stall tailspin, greatly increasing the flight envelope. However, the forward-swept wing technology is very complex, and the related technical requirements for it are relatively high, the strength requirements of aerodynamic components are large, and the problem of wingtip flutter cannot be solved. Due to material constraints, countries have been unable to overcome the problem of "aeroelastic divergence" caused by wing forward sweep. As a result, the unique advantages of the forward-swept wing have not been able to be brought into play. ”

Looking at the J-13 'Jair' forward-swept wing fighter on the second page, Su Feng couldn't help but sigh, if the J-13 'Jair' forward-swept wing fighter can appear in the world and be passed on to the troops, ensuring that it is perfected, this is definitely the world's most maneuverable and terrifying fighter with the most combat effectiveness, there is no one.

"Xiaohai, I see that you like close-range combat very much, if this forward-swept wing fighter can be equipped with troops, it will increase your combat effectiveness exponentially." Su Feng sighed towards Luo Hai.

Luo Hai silently thought in his heart: "Sweep the wings forward?" ”

Su Feng smiled at the thoughtful Luo Hai, and then continued to flip through it, the book without a cover in his hand was all about conceptual fighters and fighters designed by the influence of left and right ideas when designing airplanes.

Regardless of the development of the country at that time, such a fighter can only survive on paper, and even a real room concept machine cannot be manufactured.

You know, the value of the technology contained in a high-performance fighter is almost immeasurable.

These unrealistic fighters simply cannot be put into development.

Su Feng, who has been engaged in the aerodynamic layout of aircraft and aviation turbofan engines for more than 50 years at the 611 Institute, has recorded all the conceptual fighters and the fighters that took a fork in the road in those years, and kept them in this high-secrecy book.

The specific number of real yàn and fighter jet jù are stored in the real yàn room of zài611, and irrelevant personnel with insufficient authority cannot view them.

After reading all the conceptual fighters to Luo Hai, who was in thought, Su Feng put the book in his backpack, and then took out another book that also did not have a cover, turned to the last two pages, and looked at the two aero engines recorded on it, Su Feng couldn't help but sigh:

"Xiaohai, if this aero engine can be developed, I will be satisfied in my life."

Luo Hai looked at the last two pages of complex engine drawings, a little confused: "This is?" ”

"Adaptive cycle variable aviation vector engine, overall layout two-stage low-pressure rotor fan + low-pressure compressor - two-stage high-pressure rotor fan + high-pressure compressor - four-stage high-pressure compressor - single-stage high-pressure turbine - single-stage low-pressure turbine. Do you know about the YF120 engine and the ACE engine? They, this is definitely a milestone in the history of aero engines! ”

Su Feng talked about the adaptive cycle variable aviation vector engine he designed, and the whole person immediately became excited.

"I combine the speed of the turbofan engine suitable for the atmosphere and the scramjet engine in the near-earth atmosphere, under the design of the overall layout, this WS-20 'Sun' adaptive cycle variable aviation vector engine, as long as it can be developed, then the aerospace fighter has the key core power technical support!"

Hearing Su Feng's words, Luo Hai's eyes suddenly widened, and he looked at Su Feng incredulously: "Grandpa Su, what do you mean?" This WS-20 'Sun' engine is the power core of the aerospace fighter's equipment?!!! ”

"That's right, as long as it can be developed, our country's air force and scientific and technological level will rise exponentially, you can't imagine the science and technology it contains, just the material, no country in the world and the material real room, has not been developed!"

Speaking of the WS-20 'Jiaoyang' aero engine he conceived, Su Feng couldn't help but be proud, but after talking about the actual situation, Su Feng's feelings gradually declined.

The most important material for this WS-20 'Sunny 'Aero Engine' has not been developed even by the United States in the world at present.