The military-industrial scientific research system of the academic master.

According to the original plan, in the next few days, Chang Haonan should work with Sun Huizhong to design the DSI air inlet applied to the training aircraft as quickly as possible, as well as the overall structure of the aircraft, so that Guizhou Airlines can Construction of the first prototype began as soon as possible.

However, the plan could not keep up with the changes.

His previous worries are gradually turning into reality——

With heavy rains falling in most parts of the country for several consecutive days, the super flood, which is almost unprecedented in scale and scope, seems to be coming ahead of schedule...

However, what really made Chang Haonan realize the seriousness of the situation was that on a night of moderate rain as usual, he was called to the Commission of Science, Technology and Industry for National Defense for an urgent small-scale internal meeting.

Far less formal than last time, but the specifications are even higher.

Liang Zhuoping got straight to the point and took out a piece of recording paper.

The above is a transcript of the call:

"According to the report of Factory 132 this afternoon, in the past half month, the total precipitation in Chengdu has exceeded 550mm. Although the factory has done its best to drain waterlogging, the local natural water storage capacity has basically reached the upper limit, and some Water has accumulated on the ground in the lower living areas.”

"According to today's report from the Meteorological Bureau, after a brief period of cloudy weather from tomorrow to the day after tomorrow, there will be heavy to heavy rains for at least a week. According to the judgment of Comrade Yang Baoshu, general manager of Rongfei, it is difficult for the interior of the 132 Factory to bear any more With the impact of a round of rain, and as time goes by, the possibility of inducing geological disasters is also increasing, the risk of the No. 01 prototype of Project continuing to be parked in the final assembly workshop is very high."

"So Mr. Baoshu just called us and proposed two methods. One is to move the prototype to a relatively high position in the factory area, where the radar station of the 132nd Factory Militia Anti-Aircraft Battalion used to be. The ground is flat and paved with cement, so we should be able to hold on for another 5-7 days, but if the rain continues unabated after a week, we may still suffer losses."

"second……"

Having said this, Liang Zhuoping even hesitated for a moment before continuing:

"Considering that the No. 01 prototype of Project 01 is actually capable of its first flight, in order to avoid greater losses, he hopes to allow No. to take off early the morning of tomorrow and transfer to a nearby safer airport for temporary refuge. ."

Obviously, this is definitely not optimistic news.

An aircraft that has not yet made its first flight has to consider a long-distance transfer flight under relatively harsh weather conditions.

The risks involved are certainly not small.

For Rongfei to make such a shocking request only shows that the local flood control situation is already difficult to control.

Everyone's expressions became serious.

Although Chang Haonan has been paying attention to the precipitation conditions across the country from the news these days, this application from Factory 132 made him intuitively feel the huge threat of floods for the first time.

After a period of silence, Ding Gaoheng cleared his throat and first confirmed:

"According to Yang Baoshu, the morning of tomorrow should be the last window for takeoff?"

Liang Zhuoping nodded:

"That's right, the weather conditions further away do not support flight at all, and it is also very difficult to move from the radar position to the runway. Basically, if you choose the first path, you will have to fight the flood to the end."

No one spoke again for the next few minutes.

"Snapped--"

The crisp sound of a lighter rang in the small room.

Minister Cao Gangchun of the General Armament Department habitually wants to light up a cigarette.

But just when the flames reached the head of the cigarette, he looked at Chang Haonan sitting next to him. After hesitating, he still didn't light it and stuffed the cigarette back into the cigarette case:

"Comrade Xiao Chang, you participated in the entire ground test of the No. 01 prototype. I would like to ask, do you think this aircraft is currently capable of long-distance flight transitions?"

The latter lowered his head and pondered for a moment:

"Some of the hidden dangers discovered during the ground testing process have been eliminated, and the entire aircraft design has been completely verified, so I don't think there is a problem when it comes to long-distance flights."

However, before Cao Gangchun could speak again, he continued to add:

"But the problem is, first of all, Project No. 10 currently only has one prototype aircraft, and other related auxiliary equipment are still in the development process. If it needs to be transferred, I'm afraid there will be a lot of trouble."

"First of all, the No. 01 prototype does not even need to use the auxiliary fuel tank. Considering that some fuel must be reserved for backup when landing, the safe transition distance may not exceed 1000 kilometers. This distance is the plateau to the west, and the altitude of AL31FN The ability to take off and land on the plateau has not yet been verified. Going south and east, the risk of floods is greater than that of Chengdu, so we can only go northwest, and the distance is very limited. We cannot allow planes to land at civil airports."

"Secondly, even if the transition is over, the local area will definitely not have the ability to maintain and protect domestic third-generation fighter jets. It will be difficult to even supply high-quality aviation fuel. How to get the aircraft back to Chengdu in the future is another problem."

"Moreover, if Factory 132 is really damaged by floods, even if the prototype is retained, the losses to our country's aviation industry will probably not be small."

Obviously, this is a dilemma.

After all, in the face of a natural disaster of this level, it is impossible to have a foolproof strategy. You can only choose one with relatively small risks.

In the next nearly half an hour, everyone put forward one idea after another, but in general, they were not more stable than the two reported by Yang Baoshu.

But Chang Haonan never spoke.

In fact, after learning about the precipitation situation there from Sun Huizhong a few days ago, Chang Haonan has been thinking about whether there are any solutions.

For flood control and disaster relief, reservoirs are of course the most useful.

Followed by large construction machinery.

It would be better to have a heavy helicopter.

But these things obviously cannot be put together within a week or two.

What he used was cheating, not magic.

In the absence of these equipment, traditional flood control and disaster relief...

It can only be done with sandbags, rocks and human walls.

Sandbags and rocks were used to block the flow of water, while human walls were used to slow the impact of the flood peaks upstream.

This is a very effective but extremely risky approach.

Not to mention a human wall that could be washed away accidentally, even carrying rocks and sandbags is an extremely high-intensity physical activity.

You must know that emergency rescue and disaster relief will not last only one or two days.

In the case of a long period of continuous lack of rest, it is necessary to ensure the transportation speed. Many people have suffered irreparable injuries and even lost their lives.

This basic principle has not changed fundamentally even after more than 20 years, but fortunately, thanks to the development and progress of technology, the specific operating methods have improved a lot.

After a period of brainstorming, Chang Haonan finally thought of something that could not only alleviate the risk of waterlogging in the 132 plant, but also play a role in the flood fight process.

Combined flood protection module.

This idea originally originated from the prefabricated metal flood walls used in some European countries.

However, the cost of that thing is frighteningly high, and the assembly is very cumbersome. It is impossible to install it in time when a flood comes, and the actual effect is very limited.

Therefore, while learning from ideas, China also made some improvements.

The core is actually the set of stones + sandbags.

The stones were simply replaced with specially designed steel column-slab structural modules, and the sandbags were replaced with expansion bags filled with a high proportion of water-absorbent material.

When on the ground, the size and weight are very light, and a strong man can even carry 10-20 at the same time.

但是在抛入水中之后，几乎转瞬之间就能够吸水，形成密度为1/6-1.8g/cm、体积15-20升（跟沙袋基本一致）的阻塞物。

In addition to the idea, there are two key technologies for this thing.

The first is to carry out fluid-structure coupling system analysis and dynamic response design on the metal structural modules to achieve sufficient strength with the smallest possible weight and avoid being washed away by huge water pressure - this is almost Chang Haonan's best job, and Not a problem.

The second is the water-absorbent material inside the expansion bag.

Chang Haonan is not a chemical engineer, but he roughly knows that it is some kind of super absorbent resin.

And the synthesis is not difficult.

Because in the past, they were directly disposed of as industrial waste.

But I really don’t know what it is exactly and where it can be produced.

However, for this kind of thing, you can definitely ask for organizational help.

"Director Ding, Minister Cao, I have an idea."

Taking advantage of a moment when everyone was silent, Chang Haonan finally spoke.