Genius is just the threshold for me!

As the heat of summer intensified day by day, Xu Qingling stayed with Lin Dong until August.

Finally, Zhou Xiaoyan adjusted her work schedule to free up her vacation time and took her back to her hometown in the province of a thousand lakes to spend time with her grandparents whom she hadn't seen for almost a year.

[Xu Qingling]: Dongdong, the announcement is urging me to board. The flight is supposed to take about two hours, but Mom bought a Shandong Airlines ticket, so judging from the urging to board, we're going to arrive early.

[Lin Dong]: Comrade Zhang Xiali said she wanted to buy some lotus root starch, but I forgot to tell you. She said she would send two jin back later. She said she was scammed when she bought it online.

[Xu Qingling]: Hmm, I'll talk to my mom and ask her to buy it, but I don't know how.

[Xu Qingling]: I'm on the plane now, I need to put my phone on airplane mode, I'll be back in half a month.

[Lin Dong]: Okay, let me know when you arrive.

Lin Dong replied to a few messages, turned off his phone, checked that it was almost noon, picked up his keys, and leisurely headed to the canteen at the Chengdu Aircraft Industry Group base.

Because of the launch of two projects, the logistics department is working overtime. Comrade Zhang Xiali has not been going home for lunch recently. Now Comrade Zhou Xiaoyan has also taken Xu Qingling back to her hometown. He has been having lunch in the canteen these days.

"Looks like I have some free time. I should learn how to cook. Coming to the cafeteria at noon in this weather is just too much..."

Lin Dong looked up at the blazing sun and couldn't help but shake his head. Whether in his past life or this one, his cooking skills were limited to boiling instant noodles and, at most, frying an egg.

It wasn't that he was a chauvinist and averse to cooking in the kitchen; rather, it was that he had never had the chance to enter the kitchen in either of his lives.

Before university in his previous life, Zhang Xiali took care of his daily needs and meals. He ate in the university cafeteria for four years. Not long after graduation, he got together with Xu Qingling and doted on him, never needing him to enter the kitchen...

From this perspective, he was a happy man in his past life. The two most important women in his life doted on him. It's just that he was a bit too proud and couldn't let go of his pride, so he really sponged off his parents and lived off them. Unfortunately, his work wasn't going well either.

Not only did I experience several periods of unemployment after graduation, but after finally settling down, the grueling work schedule caused me to die in my early thirties.

After having a quick lunch in the cafeteria, Lin Dong didn't go home. Instead, he turned a corner and went to Laboratory No. 78.

Ding-dong-

As soon as I entered the lab and turned on my computer, a new email notification sounded.

[Chengfei Cai Engineer]: Engineer Wang, please check the latest batch of aerodynamic layout test data...

"New data already?"

Lin Dong opened the email, glanced at it, frowned, asked about Wang Xingguo's standby status, and replied immediately.

"Confirm with the flight control system design team the current latest fly-by-wire response time and control bandwidth."

The center of gravity of this aerodynamic layout is slightly rearward, which may exceed the response of the flight control system.

The aerodynamic layout and static instability trim design of manned fighter jets must ensure sufficient safety redundancy. Don't push them to the limits; if this malfunctions, the aircraft will disintegrate instantly in mid-air.

[Chengfei Engineer Cai]: Received, I'll connect right away!

:

Lin Dong ignored Cai Feng's reply and shook his head slightly: "These guys, their technical skills have improved after studying, and their design parameters are getting bolder and bolder. They even want to push the limits of static instability balance design."

Static instability is a core design feature of fighter jets, and it is a key parameter that determines maneuverability, flexibility, and consequently cruising speed, maximum speed, and fuel consumption.

Simply put, the center of gravity of a fighter jet, as well as the lift focus of its aerodynamic layout, must maintain a degree of instability.

Because the aerodynamic lift focus shifts backward at subsonic speeds, the backward shift of the focus will be greater when entering supersonic speeds. At this time, if the center of gravity of the fighter jet is relatively forward, it will be in front of the focus.

So, if a fighter jet wants to control its nose and change its angle of attack, it's like holding a hammer, but holding the end of the handle.

Because the entire hammerhead and center of gravity are positioned at the front, it takes a lot of effort to lift it horizontally, making the fighter jet's movements appear cumbersome and significantly increasing fuel consumption.

Only when the center of gravity of a fighter jet is behind the aerodynamic lift focus can the nose turn more flexibly. This is like holding the hammer head; the hammer can be easily lifted.

The distance between the center of gravity and the focal point is the static instability of the fighter jet. Normally, to ensure maneuverability, the center of gravity of the fighter jet must be further back than the focal point.

However, it's also not good if the center of gravity is too far back.

One issue is that if the center of gravity is too far back, the nose will have a constant upward inertia. When the fighter jet is flying at level, the elevator must be kept significantly deflected downward for trim. As a result, when a rapid maneuver is needed for dogfighting, the elevator will not have enough margin.

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Another issue is excessive static instability, which means that if a fighter jet encounters a sudden situation, it may become uncontrollable within milliseconds. In this case, the flight control system and servos are required to keep up with the balance immediately.

If the fly-by-wire flight control system fails to respond in time, the entire fighter jet will instantly lose control and then disintegrate in mid-air due to the tearing force caused by different torques...

Ding-dong-

Lin Dong replied to Cai Feng's question, then replied to a few more emails. Just as he was about to log out of Wang Xing's email, an external email popped up.

[Shenyang Aircraft Corporation's Yuan Li, the old guy]: Old Wang, let's hold an online meeting to discuss the stealth coating design of the J-35 fighter jet. We evaluated the US's iron-based coating solution, but it's too easy for it to rust when used on carrier-based aircraft.

Show us your Chengdu J-20 fighter jet, and those stealth unmanned combat aerial vehicles, and their stealth coating solutions... We've got our eye on them, and we'll send you a technology cooperation project proposal.

Discuss stealth coating solutions for the J-35 fighter jet?

Shenyang Aircraft Corporation's R&D speed is so fast, it only took four years to complete the fuselage and start researching stealth coating solutions?

Lin Dong recalled the official start time of the J-35 fighter jet's development, and a hint of surprise appeared in his eyes. He quickly checked the historical communication records between Shenyang Aircraft Corporation and Chengdu Aircraft Corporation regarding the J-35 fighter jet, and a look of realization appeared in his eyes.

"Good heavens..."

"Shenyang Aircraft Corporation (SAC) is actually skipping its older brother's research and coming to Chengdu Aircraft Industry Group (CAC) for research instead!"

Based on historical communication records, Lin Dong immediately understood why the J-35 fighter jet project was progressing so quickly.

That is, Wang Xingguo, Lin Weiliang, Jiao You and others published a lot of papers on aircraft design and engine-related topics, and Shenyang Aircraft Corporation studied and worked hard on those papers.

If they encounter something they don't understand, they'll send over an online meeting and a technical cooperation project proposal, emphasizing flexible application and paid consultation, but they never give up.

:

Thinking of this, Lin Dong picked up his phone and sent a message to Wang Xingguo.

【56】: Shenfei sent an online meeting email. How should I handle it?

[001]: What? I'm coming right now!

Crack—

Wang Xingguo replied to a message, and less than ten seconds later, the door to the adjacent final assembly workshop opened.

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