In one sentence, everyone's eyes once again focused on Chang Haonan at the back of the conference room.

Only this time, he could barely feel the suspicion in everyone's eyes.

After clearing his throat, Chang Haonan said his specific plan:

"The main risk we face now is that we are not sure how far the results of the computer simulations will be from the real situation, so we can verify them in two steps."

"The calculation of aileron efficiency is essentially a flow field analysis, so we first select a working condition that ensures the safety of the test flight, such as 1.2 times the speed of sound, 10° elevation angle, and then I calculate the flow field distribution on the wing surface in this case, and then conduct a test flight."

"If the results obtained from this test flight are consistent with the calculation results, it means that there is no problem with the accuracy of the calculation results, and the next step can be more radical and directly carry out the test flight near the working condition point where the aileron reaction occurred."

This idea was actually inspired by the previous 603 Institute, which used a similar approach to divide the active flutter control technology into two steps, speeding up the verification process and controlling the risk within an acceptable range.

Of course, it is acceptable, but after all, it is not as safe as the most conservative successive approaching method, and it still requires Yang Fenghat, as the chief designer, to bear a certain amount of pressure.

As soon as Chang Haonan's words fell, a young-looking engineer next to him asked:

"This method is theoretically possible, but how should your first step, verify the flow field on the upper surface of the wing in the bombed state, how should you proceed?"

Since sensor technology in the 90s was not advanced enough, it was difficult to measure the flow field distribution of the entire wing surface in real time, and many times it was necessary to judge by the subjective feelings of test pilots.

The wind tunnel model is okay, but the degree of restoration cannot be compared with the test flight after all.

It's just that this question doesn't even need to be answered by Chang Haonan.

"Engineer Zhao has just joined the work for two years, so there may not be much understanding of some things, but our 601 Institute has long had experience in solving this kind of problem."

This time, it was the old engineer Xu Jin who opened his mouth to explain to Chang Haonan.

In fact, he has no prejudice against digital design itself, after all, people who are engaged in aircraft design can't really be antiques, but they simply think that Lin Shikuan and a few of them just burn money and don't do anything.

Therefore, after he just saw the report brought by Chang Haonan, he was very curious about how far the other party could go.

"When we were engaged in the J-8B before, Committee member Gu relied on sticking wool on the fuselage to observe the airflow on the surface of the fuselage, which solved the problem of vibration that had plagued us for a long time, and now we can use the same method again."

The title of academician only began to appear in October 1993, and before that, it had been called a member of the school department, so it is normal for older people to not be able to change it for a while.

Chang Haonan looked at Xu Jin, who was looking forward to it not far away, and continued to add with a smile:

"Engineer Xu is right, you can choose a few representative points on the surface of the wing to paste wool, and then find a two-seater aircraft to fly next to you, so that you can intuitively observe the airflow at the corresponding position, and then compare with my calculation results after the test flight to draw conclusions."

And Xu Jin is naturally not the only one who agrees with this idea.

"In two steps...... This idea is a bit similar to the advanced achievement declared by Ho Jing some time ago......"

Seeing that someone in the conference room had already mentioned the matter of the 603 Institute, Yang Fenghata also took the opportunity to speak:

"In fact, everyone here may not know that the main person who completed the achievement just declared by the 603 Institute is Dr. Chang Haonan."

One stone stirs up a thousand waves.

Although many people have heard about the MA60 project, they still don't know some details because it is not yet the time to focus on internal publicity at the end of the year.

Except for a few leaders such as Yang Fenghat, no one on the 601 side knew that the first person to complete the achievement of the 603 Institute was actually from Jinghang University.

"It turned out to be his ......"

"It's really amazing to be able to be the first person to complete at such a young age......"

“……”

These front-line engineers, and they are all engaged in confidential work, may not care too much if they say who has published what papers.

However, the advanced achievements assessed by the Aviation Industry Corporation or the Commission of Science, Technology and Industry for National Defense are definitely hot things in everyone's eyes.

Being able to hang a name in it is something worth writing about for many people, and Chang Haonan looks less than twenty-five years old at most, and he is already the first person to complete it.

When the voices of everyone's discussion calmed down a little, Yang Fengwan gently tapped the table with the pen in his hand:

"Considering the experience of the brother research institute, I think the method proposed by Comrade Chang Haonan should be feasible, so let's do it, as for the candidate who will go to the sky with the plane, ......"

"Since I'm in charge of the calculations, then let me do this heavenly job."

When he first proposed this plan, Chang Haonan had already thought about doing it himself:

In addition to the sense of responsibility, there was a less important reason that he really wanted to experience what it was like to fly in a fighter jet.

"The current conditions are much better than when Gu Lao was back, and I can bring a camera up and take pictures of the airflow pattern on the wing surface of the prototype."

When Gu Yongfen designed the J-8B, he brought a telescope to observe on the spot, and in 1996, cameras with optical zoom capabilities were quite popular, and they could take pictures for archiving, and then analyze them slowly after returning to the ground.

Yang Fenghata communicated briefly with the two deputy chief designers next to him, and then raised his head and said:

"We agree in principle on this matter, but we have to ask the comrades of the Air Force test flight unit to give you a physical examination and make sure that there is no problem before you can get on the plane."

Chang Haonan naturally has no opinion on this, and when the Air Force recruited for a physical examination, he only had the unqualified part of his teeth that were not fit.

……

What was originally an ordinary routine progress seminar became extremely fulfilling because of Chang Haonan's appearance, and it lasted for six hours.

By the time all the details of the verification work had been finalized, it was close to midnight that day.

"Then the situation of the wing efficiency test will be decided first, and after the meeting, Dr. Chang and Dr. Yao, as well as the digital design team, will come up with the simulation results of the flow field as soon as possible. As for the issue of airplanes, I went to contact the comrades of the Air Force and asked them to borrow a Jianjiao-7. ”

Yang Fenghata summed up in a somewhat hoarse voice:

"As for the comrades of the other groups, we will continue the work at hand first, and if the problem of aileron reaction is verified by then, we will discuss a solution."

"Adjournment!"