Genius is just the threshold for me!

7:30 p.m.

Everyone packed up a meal for dinner in the canteen. Lin Dong and the others tested all the parameters and transported the engine back to Xu Ziming's workshop.

Wang Xingguo recalled the data and was still somewhat shocked, saying, "The thrust-to-weight ratio is 20.1 on the ground. If we go into the air, the optimal fuel efficiency thrust-to-weight ratio for hypersonic vehicles can reach 22 or even 23..."

Grandpa's.

The most advanced low-bypass turbofan engine currently available is still the F119 series engine from the F-22 Raptor fighter jet, with a thrust-to-weight ratio of 10.8. This thing truly makes one engine do the work of two.

"..."

Lin Dong's expression subtly twitched as he listened to Wang Xingguo's words.

Raptor F119 series engine?

Ten years later, this thing was re-audited according to the new standards, and its thrust-to-weight ratio dropped directly from 10.8 to 7.95, and that was with added power. It went from being a raptor to a chicken.

Compared to the lift coefficient of the fuselage, the thrust-to-weight ratio of the engine is a parameter that is easier to present in a PowerPoint presentation.

After all, thrust-to-weight ratio = thrust / weight.

However, this weight varies. Some use the dry weight excluding fuel, lubricating oil, and starter motor, some use the wet weight, and some use the weight of the installed machine.

Based on dry weight calculations, the thrust-to-weight ratio of the WS-15 engine can reach 11.

However, if calculated based on the standard installed weight, the thrust-to-weight ratio is only 9.68, which is less than 10.

The difference between dry weight and installed weight, plus a little bit of marketing embellishment, and the PowerPoint presentation is a success.

After all, it's impossible for anyone else to disassemble the engine, weigh it, and then put it on a test bench to test its actual thrust.

This is like the data for a heavy machine gun; Big Brother gave it a weight without a support.

In China, people immediately assumed it was the standard weight with a support, and were terrified...

"The engine will be installed tomorrow. Remember to come then. If you have any questions about the plan, just give me your ideas. If there are no problems, I'll start installing it..." Xu Ziming closed the door of the cleanroom and gave Lin Dong his instructions.

Although Lin Dong's designed aircraft had not yet encountered any problems, Xu Ziming still gave a serious instruction according to procedure.

"it is good."

Lin Dong nodded and led Xu Qingling to Laboratory 78 before leaving. As they walked out of the laboratory, Xu Ziming and Lin Weiliang arrived.

As for Jiao You and Wang Xingguo...

One group consists of those who came here before June 624th to jointly tackle the project, and the other group includes those who have been arranged to have single dormitories.

One is that her godmother, Su Ruohua, who was in charge of the Dongfeng-17 project in the Northwest, did not return and moved back to her office's rest room.

"Uncle Xu, when will that workshop be finished?"

Lin Dong walked for a while, and seeing that no one was around, he suddenly remembered something and asked.

"The foundation and main structure of the workshop were completed last month. Now, large milling machines are being disassembled and installed. We'll need to conduct repeated testing and adjustments..."

Xu Ziming knew that Lin Dong was asking about the Red Ghost project, specifically the workshop where the wings were manufactured. After thinking for a moment, he replied, "It will probably take another six months, around April next year."

"July..."

Lin Dong frowned slightly upon hearing this. According to his plan, the workshop was to be in place by April, which was clearly a bit tight on time.

After all, a wingspan of over thirty meters, and a delta wing at that, means that manufacturing alone would have to be calculated on a monthly basis.

Considering the scrap rate of 70% to 80% for the entire cutting process, even if the workshop completes the work in April, there is no guarantee that a qualified wing can be delivered before December.

But after thinking it over, Lin Dong didn't urge him.

Because he knew that this was already the limit of progress.

The construction of machine tools, especially the construction of such ultra-large machine tools.

From the construction of the load-bearing base and the workshop to the installation and debugging of the machine tools, the entire process is no simpler than designing and manufacturing a large aircraft, and every step is indispensable.

For example, the construction of the foundation must ensure that it solidifies as a whole, that natural settlement meets the standards, and that thermal expansion and contraction meet the standards.

Of these three, only the first one can be controlled technically; the latter two require time to verify, and even slight deviations could affect the precision of the machine tool.

The installation of machine tools is similar. The overall installation consistency must be ensured, the debugging and calibration must be in place, and the break-in control must be stable. All of these are technically challenging and time-consuming tasks.

"Lin Dong! Qing Ling!"

After chatting with Xu Ziming and Lin Weiliang for a while, Lin Dong walked slowly with Xu Qingling. Just as the four of them reached the entrance of the residential area, a girl's shout suddenly rang out from the side.

Ok?

Lin Dong turned his head and saw Xia Ran, who was probably taking a walk together after dinner and was wearing a high school uniform, Xia Tianqiang, who was holding documents in his hand, and He Ying, who was holding hands with Xia Ran. His expression immediately became a little strange.

"Xia Gong..."

Seeing this, Xu Ziming couldn't help but chuckle and asked, "Is it you taking the college entrance exam next year, or is it Xia Ran?"

A high school senior taking a walk empty-handed, while someone who has been working for almost twenty years is walking with study materials in hand. If you didn't know better, you'd think Xia Tianqiang was repeating his senior year of high school.

"this……"

Xia Tianqiang gave an awkward laugh: "After the National Day holiday, Engineer Wang only gave me two outlines, which suddenly made the learning more difficult. I can only squeeze in some time to catch up... Engineer Xu, don't you need to study?"

More than half a year has passed since the Lunar New Year.

It took him more than four months to adjust since the outline was reduced from four to three in May.

Last week, right after the National Day holiday, suddenly, the study assignment sent to Wang Xingguo's email address had become two separate outlines.

"Ahem, it seems that Engineer Wang values ​​you quite a bit."

Xu Ziming coughed awkwardly twice, glanced at Lin Dong discreetly, and replied, "I'm fine. I didn't increase the difficulty, so I can complete the mission."

Thanks to helping Lin Dong make Hot No. 5, he hasn't had any study assignments this month... he's escaped a disaster.

"Uncle Lin, Uncle Xu."

Xia Ran then politely called out to Lin Weiliang and Xu Ziming, let go of her mother's hand, and ran towards Xu Qingling and Lin Dong.

"How is it?"

Xu Qingling called out to Xia Tianqiang and the other girl, then took Xia Ran's hand and looked at her high school uniform, smiling happily, "Are you adjusting to the senior year atmosphere?"

Since Xia Ran started high school, the distance between the teaching areas has changed, and the dismissal times are also different.

Apart from seeing each other on Saturdays and weekends, we don't run into each other on weekdays when going to and from school. Including the National Day holiday, we haven't seen each other for more than ten days.

"Well enough."

Xia Ran smiled and said, "I studied at home during the summer vacation and got second place in the grade in the first monthly exam."

"Second in the grade?"

Xu Qingling exclaimed with delight, "Don't worry, we'll get Tsinghua and Peking University!"

Shishi High School, ranked among the top three key high schools in Chengdu, consistently produces several students who are admitted to Tsinghua and Peking Universities every year.

Xia Ran is currently second in her grade. If she can maintain this position, she's definitely on her way to Tsinghua or Peking University.

"It's still pretty tough. Let's go get some milk tea..."

Xia Ran smiled and looked at Lin Dong, asking, "Lin Dong, shall we go together?"

"Alright."

Lin Dong glanced at Xu Qingling, nodded, and said, "It's my treat. Congratulations on getting second place in the monthly exam."

"Are you treating?"

Xia Ran chuckled in surprise: "If Yao Yao knew, she'd definitely yell at you..."

"Let's talk about it when she gets second place in the grade."

Lin Dong calmly replied, told Lin Weiliang and Xu Ziming, and led the way towards the milk tea shop.

"Wait! Hold on!"

I had walked less than ten meters when suddenly a shout came from the direction of the residential area.

Su Yue ran out carrying a bag of trash, quickly ran to the three of them, and cheered, "I went downstairs to throw out the trash and heard you guys saying you were going to the bubble tea shop, and someone was treating you..."

"..."

Lin Dong's lips twitched, and he said speechlessly, "Come on, all of you, come here."

talking.

Lin Dong took out his phone and tagged everyone in the group: [Bubble tea shop, come over if you want some, it's on me today.]

[Li Tao]: I'm still on the toilet, getting ready to take a shower, wait for me!

[Zhang Yihao]: Now past.

[Jiang Caiping]: I'll be there later.

[Huang Qingyao]: Lin Grandet, did the sun rise in the west today? @Lin Dong

"Yay! Lin Fuhao is paying the bill today..."

Seeing that Lin Dong agreed, Su Yue quickly went to throw away the trash. She ran back as if she had thought of something, took out her phone, found a poster photo, and asked Lin Dong, Xu Qingling, and Xia Ran.

"Hey bro, bro, I saw the promotional poster today. Lin Dong's uncle's Xingdong Company is building a sci-fi themed museum in Chengdu, and it's opening next week... Now that I'm not busy with anything and the lockdown order has been lifted, how about we make plans to go together when it opens?"

"Let's talk about it next year."

"Next year."

Xu Qingling and Xia Ran answered almost simultaneously.

As soon as they finished speaking, Xu Qingling's expression shifted, as if she had sensed something, and she turned to look at Xia Ran.

"I still need to review."

Xia Ran smiled and said, "Let's go have fun after the college entrance exam next year."

"It's newly opened, so it's not quite perfect yet. I'll go check it out next year," Xu Qingling replied with a smile.

"Oh well."

Su Yue nodded: "I'll call Li Tao and Yao Yao, and we'll go scout ahead first!"