Since the last time Captain Yan took the Arab Yemeni pilots to the sky for a lap, everything has been so smooth, and Arab Yemen has a deep understanding of the Jianjiao 7A and knows that this is a very good aircraft.

The next day, Yang Hui took these guys to watch the flight performance of the J-74, the single-seat cockpit design made the flight resistance smaller, and the turbofan 10 engine provided more surging power.

In addition to the 12 J-74s supported by Saudi Arabia, Arab Yemen paid out of their own pockets and added eight J-74 purchase orders, so that there were enough 30 J-74s and J-7A mixed teams.

After the order was placed, Arab Yemen left four accompanying pilots in Southwest Science and Industry, trained by Southwest Science and Industry, and learned to use Jianjiao 7A and J-74 fighters, and Yang Hui was also pulled to a hangar by Liu Jun with an excited face after doing something here.

The proud Liu Jun pointed to an airplane in the hangar: the silver fuselage, but after the green paint embellishment in the sections and openings, it looked very industrial.

"Look, this is the large-edged strip wing technology verification aircraft that we improved on the basis of the J-74 fuselage, everything has been assembled, and after installing the digital fly-by-wire flight control in another month, he is the first digital fly-by-wire flight control aircraft of our Republic to test flight."

Yang Hui's old and spicy eyes are here, even if there is no introduction from Liu Jun, Yang Hui can understand that this is the big side strip wing technology verification machine, Yang Hui now sees this aircraft and his thoughts are a little emotional.

Based on the J-7, the air intake channel was changed to two sides of the air intake, a huge nose radome was installed, and the landing gear was also changed to an outer figure-eight landing gear to receive the rear of the air intake, a plump fuselage, and a newly designed tail compartment. There is also the large side wing with a 75-degree sweep that extends all the way to the tail of the fuselage, and the main wing, flat tail, and vertical tail leading edge are all the same 42-degree sweep angle.

Although Yang Hui intentionally or unintentionally leaned on the design of this aircraft when designing this technology verification machine, when Yang Hui really saw this aircraft, he was still surprised by its appearance.

In terms of appearance, it is different from the tail nozzle of the engine tail nozzle and the tail nozzle of the Thunder. Yang Hui really can't see any differences from the Thunder 01 prototype (i.e., the Thunder prototype that does not use the DSI air intake).

This is simply the early birth of Xiaolong, Yang Hui was almost uncontrollable at this moment and wanted to shed tears, reborn for so long, and finally saw a main aircraft developed by the Republic in later generations, it was really kind.

Seeing the only difference between this technology verification machine and Xiaolong: the simple convergence of the tail nozzle, Yang Hui has no regrets.

After the turbofan 10 engine was finalized, the second institute handed over the design data of the turbofan 10 engine to the Liming Factory, which was regarded as a clear of the two from then on.

After the turbofan 10 engine of the second institute was finalized, it was still under development with the help of the new medium thrust and core engine. During the period when it was impossible to start the development of the new middle push, the development of convergent and diffusion tail nozzles had already begun, and it is believed that it would soon appear in the improved model of the turbofan 10 engine.

"Okay, it's really a beautiful aircraft, I think it's much more beautiful than the J-74 we are developing now, as a technical verification aircraft, it is absolutely successful, according to the design requirements of this technical verification machine. It should be a standard third-generation aircraft. ”

Not to mention, the reason why the Thunder Dragon in the previous face is called a pseudo third-generation fighter. It's just that the Thunder's fly-by-wire system is incomplete. But now it's different, this time the technical verification machine is completely the highest-end full-authority three-redundant digital telex, which is almost the sign of the third-generation machine, who dares to say that this is a pseudo-third-generation?

Speaking of the digital fly-by-wire of the third-generation aircraft, Yang Hui suddenly thought of another question, it has only been less than a year since the digital fly-by-wire flight control project began. How could it be possible to come up with a finished product so quickly for such a huge project as the flight control rate, this is the most puzzling point for Yang Hui!

"I just said that the fly-by-wire flight controller will be developed and will be installed on the plane for test flight next month, is this time a little ...... Is the digital fly-by-wire flight control rate really written by ourselves? ”

This is a very sharp question. Yang Hui is still very concerned about the development of digital fly-by-wire flight control, and knows that this thing is just a matter of writing the control rate. Without about two years, it is almost impossible to come up with it, after all, there is no domestic experience, and the control rate of the digital flight control system is still the first time.

Yang Hui stared at Liu Jun deadly, just waiting to see what kind of explanation Liu Jun could give, in the mastery of this key technology, Yang Hui could not tolerate any fraud, and now that it is fake, it will be reflected tenfold and hundredfold in the future.

Yang Hui obviously thought too much, there is such an opportunity, how dare the team responsible for the writing of the digital flight controller to make a fool, the reason why this time can come up with results so early, there is a special reason.

Liu Jun explained to Yang Hui again: "This flight control compilation, it really is not all written by ourselves, we wrote the flight control rate of the longitudinal axis, and after submitting it to Northrop for review, Northrop thinks that we already have the ability to write a digital flight control rate, and there is no need to continue to waste time writing all by us, so"

"So, let's just write the longitudinal axis flight control rate, and the other two axis control rates that control the roll direction and yaw direction are provided by Northrop? We didn't write all the flight control rates for this demonstrator? ”

Hearing that Yang Hui had guessed all the results, Liu Jun didn't say much, but affirmed the results of Yang Hui's reasoning, as if he admired Yang Hui's clever calculations.

Now Yang Hui is also weighing the pros and cons here, and has successfully mastered the compilation of the longitudinal axis flight control rate, which can almost be regarded as mastering the most important part of the writing of the fly-by-wire flight control rate, and the others can continue to be written in accordance with the method of compiling the longitudinal axis flight control rate.

Therefore, what Northrop said is not wrong, but Yang Hui feels that there is still some unsatisfactory information without writing a complete three-axis flight control rate, and there are still loopholes.

"That is, we are not involved in the preparation of the flight control rate in the other two directions at all? I'm afraid this is opportunistic, will it be in the future?"

"Hey, I thought Secretary Yang that you were worried about something, it was that I didn't make it clear to you just now, it was Northrop who saw the longitudinal axis flight control rate we submitted, and felt that we had broken through the technology of writing the flight control rate. In order to speed up the progress of the project, Northrop participated in the preparation of the flight control rate in the other two directions, which can be said to be the flight control rate jointly developed by our Southwest Science and Industry and Northrop. ”

After Liu Jun's introduction, Yang Hui finally figured out the specific way here, it turned out that Northrop saw that Southwest Science and Industry had mastered the preparation of the fly-by-wire flight control rate, and felt that there was no need to keep it secret, so in order to speed up the progress, he personally participated in the later preparation.

That's right, where does Yang Hui need to think so much, Northrop's participation in the preparation of the flight control should be said to be of great benefit, which can be said to be a deficiency in helping Southwest Science and Industry consolidate technological breakthroughs.

This is like in the novel of cultivating immortals, after breaking through the realm, there must be great power to help consolidate the foundation, and the current Northrop is such a living Lei Feng. (To be continued......)