Is there a problem?

Everyone buckled the back of their heads and looked at the Peng plane carefully, their faces dazed.

Some people feel as if there is something wrong with it, but they can't say it, so it can only be attributed to the lack of spirituality.

Li Zhen saw that they couldn't find a problem, so he simply said: "There is a problem with the model." The area of the wings is too large. ”

Everyone opened their mouths and stopped talking.

Team leader Liu Hongyun smiled dryly: "Master Li, this is an improved model. The look we designed before was later overturned. ”

Li Zhen asked: "Why was it overthrown?" ”

"Because we feel that long-distance flight stability is the first priority. The previous wings covered too little area and did not have enough bearing capacity, so they were not suitable for long-distance flights. ”

Li Zhen laughed: "Who told you that the bearing capacity is insufficient?" Did you know that when the wings are big, they are unstable? ”

"Why?"

"Because there were so many accidents. If the wings are too large, the speed will be slower. You're sacrificing speed for stability. But in fact, in the sky, speed comes first. As long as the speed is supplied, the lift will continue to increase. And when the wings are bigger, the speed will be slower and the thrust will be slower. This is a thrust plane, everything depends on the engine, and when the thrust becomes smaller, the lift decreases. Instead, it will increase the load-bearing. ”

Xun Jiayuan frowned and said, "That's not the truth. You see, the wings have become larger, and even if the engine in the air is turned off, it can glide smoothly and land. ”

Li Zhen smiled: "The previous wing size, even if it is a little smaller." After the engine is turned off, it can still glide and land. Don't forget, you are biplanes. If the size of the wings is increased, the weight will inevitably increase, and if the wings become heavy, then the loss is lift. ”

The crowd was speechless. If you think about it, it seems to be so.

Liu Hongyun asked again: "Then Master Li thinks that we need to reduce the size of our wings?" ”

"That's right. This size has to be reduced. Another important point is that your aircraft is not the right model. This model is not streamlined, but rather like a big cylinder, flying into the sky like a fat-headed goose. Silly and stupid. ”

"But there's going to be someone sitting inside."

"No matter how many people sit inside, you can't sacrifice the streamline. Streamlining is key. A few more processes, don't let the model of the aircraft become such a clumsy shape, it can become streamlined without changing the volume. ”

Xun Jiayuan was stunned: "If you don't sacrifice volume, how can you change it?" ”

Li Zhen gestured: "Look, let this place have more edges and corners, and let the cylindrical fuselage be concave in some places." The amplitude of the recess does not need to be very large, and it does not affect the ride of the personnel at all. Isn't it streamlined? You don't have to change the skeleton, the skeleton is facing it, just change the shape of the fuselage, and it's easy to be streamlined. ”

Xun Jiayuan slapped his thigh: "That's right." I always feel that it is not spiritual, but I can't say why it is not spiritual. It's because I unknowingly sacrificed the streamlined fuselage. ”

Li Zhen said again: "Also, the wings must also be changed." The shape of your wings is like a ruler. Like a machete. This actually increases the wind resistance. The wings can also be changed to be streamlined. ”

"How do you change the shape of the wings?"

"Your wings are like a machete, cutting straight forward, and the angle between the wings and the fuselage is also 90 degrees vertical, which is unacceptable. Adjust the angle of attack of the wings so that the root of the wings and the fuselage are obtuse in front and acute in the rear. In this way, it becomes a dagger and slashes forward diagonally. Do you think the machete slices forward horizontally, or the dagger slashes forward diagonally? ”

After Li Zhen finished speaking, the people in the design team were boiling.

、

"That's right. You don't have to make the wings so straight. ”

"Our wings are all regular rectangles. But that's wrong. ”

"The wings can be in a triangular shape, wider the closer you get to the fuselage and narrower at the tips of the wings. Isn't that streamlined? ”

"I'm sure that if it is changed in this way, the speed of the aircraft can be increased by more than 15 percent at the same power."

"Fifteen percent is less. I estimate 20 percent. ”

"The case has finally been solved. I just said that I felt that this model was wrong, but I couldn't figure out what was wrong. I see. ”

“……”

Looking at the excited appearance of the people in the design team, Li Zhen actually knew it in his heart.

It's no wonder that they didn't think of this, these things have been learned before, and they can figure it out with a turn of their heads.

They are the authorities who are confused. I'm designing every day, and before I know it, I'm getting into the horns. But as soon as it is brought up at this time, it will immediately wake up.

As long as they are told what is wrong, they will be able to see what the problem is and how to improve it.

Liu Jinghong also made sense, during this time, he also felt that the design and development had encountered a bottleneck, and he actually had no bottom about Pengshi. I'm even more afraid of delaying the business. But today, the problem has finally been solved, and it is worth celebrating.

Xun Jiayuan glanced at Li Zhen, and he really admired it in his heart.

Alas, how can this small young man be so talented? He is proficient in all fields, and there is basically nothing he can't do. This was still the first champion of Kyushu under his rule, and his glory was already famous all over the world at that time. And who would have thought at that time that the first champion was not his stop, but the beginning of his glory.

Terrible.

After Li Zhen finished speaking, he found Xun Jiayuan again, and said with a smile: "Is Xun Lao still comfortable staying at the Kyushu Academy of Sciences?" ”

Xun Jiayuan glanced at Li Zhen suspiciously, a little embarrassed: "Hehe, what's uncomfortable." I love it, it's a science vibe, and I love what I do. ”

Li Zhen said: "I was too busy before, I haven't known about your recent situation, and I still look at Haihan." If you have any needs and requirements, please feel free to mention them. ”

"What are you talking about? I'm very content here. The only requirement is that I can be here forever, even if I am an ordinary R&D person. As long as you work in an aviation institute. ”

"Old Man Xun is almost seventy this year, right?"

"Seventy-three."

"It's time to retire at this age, you're still on the front line, aren't you tired?"

Xun Jiayuan blew his beard and glared: "What's so tiring about that?" Don't let me retire, I'm going to be really idle, I'm going crazy every day. Now life is very satisfying, I am very satisfied, money, power, beauty, that are all floating clouds. It is not easy for people to find something they really like in their life, and it is even more rare to be able to immerse themselves in their hobbies for the rest of their lives. ”

When Li Zhen heard this, he didn't know what he thought, and his eyes were a little misty and said, "Yes." ”