Xia Yu, who worked hard with Cheng Fei's design team, was not snubbed by others because he was not a researcher, but gradually became the team leader like Yang Wei as the design work unfolded. With the help of the starry sky, every argument put forward by Xia Yu seems to be able to find a way to be concretely exemplified, which also makes the design work of the X20 progress rapidly.

But just when Xia Yu was busy, our Captain Wu jumped out again. At that time, our Xia Yu was eating a boxed lunch, sitting on the floor with a group of researchers and bragging about whether they would need pelvic fins after replacing the flow field thrust vectoring engine in the morning. J-20A, or even J-20B, researchers have no opinion on retaining the pelvic fin, after all, when the slender fuselage is maneuvering at a large elevation angle, the pair of swept small vertical tails are almost completely covered by the fuselage, and without the efficient cutting of the air flow through the pelvic fin, the aircraft can easily form sideslip and fall into a stall.

Although the vector spout can make up for this in a certain range, but in terms of efficiency, it is obviously not comparable with the pelvic fin, if the pelvic fin is canceled, it can only be like the F22, make a pair of vertical tails as tall as a hill, and the vertical tail also needs to be moved forward and swept forward, destroying the original design center of gravity of the J-20, which will be a big project.

However, the new engine is shorter than the original, and if it is installed on the J-20, the tail brace is enough to block the nozzle, and the pelvic fin in the original position will form a certain interference on the air flow from the nozzle, and the pelvic fin will indeed increase the RCS value, so the researchers in the research team have not been able to reach a consensus on whether the pelvic fin is still needed.

Xia Yu is inclined to retain the pelvic fin, because when it comes to the radar scattering area, even if the pelvic fin is added, together with the vertical tail of the J-20, the area is not as large as the vertical tail of the F22, just because considering that the ground radar wave only acts under the belly of the fuselage more often, and the pelvic fin without fuselage is more likely to form radar echoes.

However, this can be improved through guò design, if the pelvic fin can still achieve the stable effect of the pelvic fin on the fuselage in the absence of a pelvic fin, it is naturally better to have no pelvic fin, but according to the overall design of the aircraft, this period involves the issue of trade-offs and balance, as long as the advantages of the pelvic fin to the aircraft outweigh the disadvantages, then there is no doubt about the choice of pelvic fin.

Xia Yu, who didn't even forget to explain his point of view during the meal time, waved his chopsticks and discussed with the surrounding research institutes, a large group of people sat on the floor of the office and splattered everywhere, and rice grains flew sideways, when Wu Jianming pushed open the door of the office, he looked at a group of researchers in white coats, most of them wearing glasses, their hair was fluffy like a chicken coop, and they were still sitting on the floor to eat, and they once thought that they had entered the wrong place.

What kind of scientific research institute is this? It's obviously a mental hospital!

"Team Wu?" Swallowing an egg in one bite, Xia Yu, who was swallowing it, saw that it was Wu Jianming, so he quickly swallowed the egg, stood up and asked, "Team Wu, why are you here?" ”

Wu Jianming looked at it when he heard it, and after seeing Xia Yu stand up, his heart finally calmed down, but Xia Yu still looked very normal, at least he didn't lose the face of our troops. Nodding at the researchers who stood up one after another, Wu Jianming said, "Xia Yu, you come out with me, there's something wrong." ”

Xia Yu said "oh", quickly put down the half-eaten lunch, and followed out quickly. As soon as he walked out of the door, Xia Yu couldn't wait to say, "Team Wu, I haven't thanked you in person for the last time." ”

"Thank you, I want you to thank you?" Wu Jianming said angrily: "When did you become so polite to me?" If you're far away from me, you're rusty, right? ”

"How can you?" Xia Yu hurriedly smiled, and then asked, "I don't know if Team Wu came to me this time, is there anything wrong?" ”

"Absolutely." Wu Jianming took Xia Yu to a small car and said, "Take you to the 34th Division to report, your future identity will be over there." ”

34 Division? Xia Yu was stunned for a moment, and then remembered that the last time he was in Zhongnanhai, the second leader said that he joined the X20 research and development program as a test pilot of the 34th Air Division, and said that Xia Yu really hadn't reported to the station of the 34th Division, but if there is such a need, it would be good to arrange a person to give him an order, why would he let the Wu team, which has nothing to do with the Air 34, pick him up?

Thinking of this, Xia Yu remembered that the last time he was kidnapped by the Americans and put him in a submarine, Captain Wu also appeared at sea at sea that had nothing to do with the 2nd Air Division to rescue him, so if you think about it, Team Wu's identity is very strange, it should be more than just the flight captain of the 5th Regiment of the 2nd Air Division, right?

With doubts, Xia Yu looked at Wu Jianming, who was driving, and asked, "Team Wu, I'm afraid you're not simple, right?" ”

"What's not easy?" Wu Jianming didn't look back, stepped on the accelerator and rushed forward.

"I mean your identity." There was a row of black lines on the back of Xia Yu's head, Captain Wu must have known what he was asking, and he was definitely pretending to be stupid just now.

"My identity?" Wu Jianming finally glanced back at Xia Yu, and then continued to look at the road and drive, and said at the same time: "I am an air force pilot, what else can I be." ”

"I won't take you to play like this, Team Wu." Hearing Wu Jianming's answer, Xia Yu went crazy and said: "I really didn't think that you would have an identity other than the captain of the 5th Regiment Flight Group, even if you helped me arrange for Ye Zi to work in Zhoushan, I just thought that you were calling an old comrade-in-arms or something to do me a favor." But the last time you appeared at sea, and now you're running to take me to the 34th Division to report for duty, Team Wu, don't think I'm stupid, which flight captain can run all over the world, I think there is no one else except you. ”

"Hey, hey, hey, hey......" Hearing Xia Yu's words, Wu Jianming laughed a few times, laughing so much that Xia Yu's hairs stood on end, and after Xia Yu felt that his back was starting to chill, Wu Jianming said, "You want to know my identity?" ”

"Yes." Xia Yu nodded in fear.

"I can't sue you yet." Wu Jianming replied, and Xia Yu's brain hit the locker in front of the co-pilot. Without waiting for Xia Yu to speak, Wu Jianming said: "I do have other identities, but this identity is highly confidential, and I can't tell you for the time being." However, this time I will take you to the 34th Air Division, in addition to reporting for duty, there are other things, so I will come to pick you up in person. ”

Seeing that Xia Yu was about to speak, Wu Jianming interrupted directly and said first: "Don't ask so much, after reporting to the 34th Division, I will talk to you again, and you will know when the time comes." ”