In fact, this is the first time that Chang Haonan has really participated in the preparation for the first flight of a "brand new aircraft".

Compared with the J-8C, which has been overhauled on the basis of the old model, and the J-7 or H-6AIT and other aircraft that have undergone limited equipment upgrades, the aerodynamic design, flight control design and various flight-related core components of the J-10 are almost completely new.

Although some electronic equipment and production process-related technologies have been verified in the J-8C, overall, the proportion of new technologies applied to the No. 1001 prototype at this time still exceeds 40%.

In general, this is a number that is enough to make a heart and lungs stop.

Not to mention the parties involved in Xue Chiyu or Song Wencong, even if Chang Haonan lives a lifetime, he knows very well that the J-10, which has a number of up to 60% in his previous life, can still successfully complete his first flight, and when it comes to this critical time, he still can't help but feel some nervousness.

There is no way, reason is rational, emotion is emotion.

The stability control system designed by Chang Haonan can only avoid the failure of the engine due to the distortion of the intake, but the accident is not foreseeable by human beings at all.

This actually leads to another problem, which is that as he influences the timeline of this life more and more, more and more things will be difficult to predict as they were when he was first reborn.

Moreover, the recent floods that erupted earlier in 1997 seem to imply that the two timelines are inherently slightly different in terms of random factors.

If the randomness of multiple weeks is a game setting, it can naturally improve the playability to a large extent, but in reality, it is not easy to get a chance to open a multi-week life, and as a result, many things are different from the previous life, but it is not so interesting.

……

That same evening.

After completing the power-on and start-up inspection of the aircraft as usual, the comrades in charge of the various systems of the No. 10 project, as well as the relevant personnel of the Huaxia Pilot Test Institute who were about to participate in the test flight, gathered together to hold a pre-flight preparation meeting.

The general pre-flight preparation will be literally before takeoff, but the situation of the first flight is different after all, and the pilot has to leave enough time, so it has to be carried out in advance.

Chang Haonan attended as "one of the important designers of the flight control system".

"Comrades, let me first clarify to you the entire process of the test flight tomorrow morning."

Xin Xiaowen, the chief pilot of the No. 10 project, gently tapped the table with a fountain pen and took the lead in speaking.

As a new key model, the original content of the J-10's first flight was relatively conservative, just a simple takeoff, flying around the field for two weeks, and then landing.

You don't even have to put the landing gear back.

The one with the largest range of motion is a turn with a steep slope.

But even these seemingly simple and ordinary subjects are still full of uncertainty for an aircraft that has never been in the sky before.

Prior to this, the No. 1001 aircraft had already carried out several high-speed taxiing tests on the ground, and the chief test pilot Lei Qiang even completed a short departure from the ground that lasted a few seconds in the wheel lifting test, proving that there was no problem with the basic design of the aircraft.

In other words, take-off is definitely able to take off.

But the problem is that neither the Iron Bird Station (the integrated test bench for flight control hydraulic systems, equivalent to a simulator) nor the ground taxiing can simulate the real response characteristics of an aircraft.

Flying an airplane is similar to driving a car in some places.

For example, there is a kind of "operating feel" that is difficult to quantify, mysterious but real.

Each model of aircraft has its own distinct personality and characteristics.

Take the simplest take-off as an example, after reaching the take-off speed, the pilot pulls the lever, how long does it take for the plane to feel the head up? How much force and speed will it be to pull up? At what angle does the plane stop when it looks up? How responsive is the engine after pushing the throttle stick? How fast to control the throttle is the balance between maintaining stable engine operation and flexibly adjusting the power level of the aircraft......

These are all things that can only be felt when a real plane flies into the sky.

These simple subjects set up in the first flight are largely to test this feeling and pave the way for more complex test flights in the future.

One of the major features of Project 10 compared with all previous aircraft projects in Huaxia is that the test flight team participated in the design process of the aircraft almost throughout the whole process, so what Xin Xiaowen said, Lei Qiang, as the chief test pilot, is more clear.

Still, he meticulously bowed his head and took notes.

Seriousness, meticulousness and meticulousness can ensure that nothing goes wrong.

"In the flight control design, the J-10 adopts the dual logic of force feedback and displacement travel, which is a first in the world, and there is no mature experience for reference."

After Xin Xiaowen's speech, Yang Wei, who is mainly responsible for flight control design, specially emphasized:

"Although all the test pilots have adapted to the iron bird platform for two years in advance, but this dual logic has not been able to be restored on the ground, when controlling the joystick, we must pay attention to the strength of the hand and the stroke of the pole at the same time, the two will work together to affect the response of the aircraft to the operation, we need the test pilot comrades to feel the impact of the two on the flight control during the first flight, whether the weight is appropriate, and the specific flight control quality."

Lei Qiang recorded what Yang Wei said with a red pen, and then raised his head:

"Understood, I'll pay more attention to this tomorrow."

At this time, Chang Haonan, who had not spoken just now, also added:

"If you have to describe it, this feel should be similar to borrowing some F16 operating logic on the basis of the Su-27."

Although it was decided that this control logic would be adopted six or seven years ago, he had a special understanding of it when he and Yang Wei had incorporated the active stability control system into the integrated flight control program, and his first feeling at that time was like this.

Of course, there is another reason for adopting this statement -

Lei Qiang may be the only pilot in the world who has flown the F16 and Su-27, two typical fly-by-wire fighters at the same time.

Therefore, when he heard Chang Haonan's words, he nodded lightly almost immediately.

The F16 adopts a rather radical side-mounted pole position afterburner control logic in the cockpit design, which can theoretically greatly improve the convenience of pilots to control the aircraft.

However, this is not the case with actual feedback, and the way the force feedback is controlled is so anti-human that it almost completely negates the maneuvering advantages of the sidebar design.

Although the flight performance of the F16 itself is quite superior, the "user experience" it brings to pilots is very average, and most of the flight qualities under the envelope are in the second and third categories, with only an extremely narrow one-class area.

It's a bit like a F1 car, with high performance, but it's hard to drive, and it's a proper master-oriented equipment.

This also results in a much higher proportion of two-seater models than almost any other aircraft.

The J-10 has learned this lesson in the control logic and chooses to integrate force feedback and displacement stroke feedback.

In fact, all the third-and-a-half-generation and fourth-generation fighters adopted a similar strategy, and this may be the first time that the Chinese aviation industry, which was still very weak at that time, led the trend in some respect.

However, as "the first plane to eat crabs", there is naturally no previous experience to refer to.

can only let Lei Qiang go up and explore it by himself.

"The pressure on the test pilot comrades in terms of the control stick is really great, after all, this is the first aircraft in the world to adopt this control logic."

Perhaps feeling that the atmosphere at the meeting was a little heavy, Yang Wei suddenly changed his words and changed his tone to a more relaxed tone:

"But there is also good news, thanks to our latest version of the flight control update, the operation of the throttle stick has become much simpler than in the past, although because the engine is not produced by us after all, so we have not been able to achieve full digital control of the function, but in some extreme working conditions, the flight control system has been able to automatically control the working state of the engine, to avoid breaking the safety limit."

After finishing speaking, he turned his gaze to Chang Haonan next to him and motioned for the latter to give a detailed introduction.

Although it has played an important role in the ground test process, as a function that has only recently been added to the J-10 flight controller, there are indeed a considerable number of people who lack a comprehensive understanding of it.

For the average user, there is no need to force it to know why, but since it is a test flight, it never hurts to know so much.

Moreover, it also increases the confidence of test pilots in the aircraft.

"That's right, the system uses specialized algorithms that can detect surge precursors that were difficult to perceive in the past, and when they are found, they can automatically deal with them and inform the pilots in the cockpit of potential risks......"

In as brief language as possible, Chang Haonan introduced the basic principle, working logic and applicable situation of the active stability control system in about half an hour:

"This system relieves pilots of engine stability concerns, allows the throttle lever to be adjusted in greater motion, and automatically selects the most efficient way to do it safely......

"The pilot just pushes the throttle, and the flight controller does the rest!"

Chang Haonan borrowed an advertising phrase that did not exist in this era, and said in a slightly joking tone.

The atmosphere in the venue was finally lively.

Actually, his set of things is a bit like an airplane version of the quattro.

When Chang Haonan introduced, the comrades of the test flight institute listened very carefully.

Especially when he said that he could predict potential risks in advance and automatically reduce the speed to avoid them, many people had complicated expressions on their faces.

As the test pilot unit that took the greatest risk, many of their predecessors died because of the surge, the biggest enemy of flight safety.

If there had been such a set of things before, many accidents would have been avoided.

"Comrade Chang Haonan, this is a talisman for our test pilots......"

(End of chapter)