Back in 1978, I was admitted to Northwestern Polytechnical University.

Chapter 79 Pulse Detonation Engine?
Dennis was a little embarrassed.

This computer is so small and portable, it's very convenient, and it even has the Ufimochev formula built in! He was very curious about what algorithm it used, so he decided to take it back and study it himself.

Qin Liang certainly wouldn't let his achievements fall into the hands of the Americans.

"Mr. Qin, look, we gave you three computers, could you give me this calculator instead?"

"Giving it to you is no problem. I have another one here, you can have this one!"

Qin Liang pulled out another one as if by magic! This one definitely doesn't have the relevant procedures!

Dennis looked at the one in his hand and swallowed hard. "I think this one's pretty good..."

“This one won’t do. It contains a program I wrote, and that program is priceless. Don’t you Westerners value intellectual property rights a lot?” Qin Liang said, and with a whoosh, he snatched it away.

"Here, take this. It's a testament to our friendship!"

Benjamin's gaze fell on the calculator. "Easterners, indeed, are a clever people!" he thought. "Overseas, the abilities of Chinese people are also undeniable."

and many more!

"You just said you wanted to change direction?"

"That's right. Using the existing technology, achieving a thrust-to-weight ratio of eight for an engine is already quite an achievement. If we continue to work hard, we can only push it to ten at most before hitting the physical limits. Perhaps we should try a different approach!"

There are many metrics for measuring an aircraft engine: thrust, fuel consumption, and lifespan. Among these metrics, the thrust-to-weight ratio is crucial. It is the ratio of an aircraft's thrust to its own weight. The higher this value, the lighter the engine and the greater its thrust!
Currently, most mainstream second-generation engines can only achieve a score of 5, which is considered good. The Americans, with their top-notch aviation technology, achieved around 8. Later, in the era of fourth-generation aircraft, the F119 engine only achieved 10, and it was also embroiled in a data fabrication scandal.

This shows that ten is already the limit!

"What direction?"

"Well... wait, time flies! It's already dark outside! Everyone, I'll take you to try another of our specialties, roujiamo (Chinese hamburger)!"

"No need, we're not hungry yet."

"Mr. Qin, tell me, what is your new direction?"

"Well... I'll write out a formula for you to see, and you can guess it yourselves."

As Qin Liang spoke, he picked up the calculator that Dennis had been longing for and started pressing the buttons.

A scientific calculator will do! The LEDs on this screen are a dot matrix that can display letters and also edit formulas!

After he finished editing, he held up the scientific calculator and showed it to the two of them: "Look, do you see it? Do you know what this formula means?"

"Pulse detonation engine?" Benjamin knew what it was just by glancing at the formula.

Assuming that when the mixture in the detonation chamber is ignited, a CJ detonation is established at the closed end of the detonation chamber, and ignoring the interaction between detonation waves... the average thrust of this pulse detonation engine can be calculated.

If a car engine ignites too early, it will vibrate violently. In the 1940s, a German engineer began to study his own engine and believed that the knocking of the internal combustion engine contained powerful energy. Unfortunately, the technology was still immature at the time.

It wasn't until the 1980s that it gradually entered practical research. Anyway, the Americans were going to do it sooner or later, so it wasn't a big deal for Qin Liang to put forward the concept and show off. Inside the computer room, everyone's eyes widened.

Pulse detonation engine? When did our aero-engine department start researching this? I doubt anyone in the whole country is doing it.

"Ahem, that wasn't me. I didn't say anything. Everyone, let's talk about what to eat tonight. Cold noodles are good too. It's cold, we could stir-fry them..."

“The pulse detonation engine has a simple structure, a high thrust-to-weight ratio, and can theoretically easily reach over 15. Moreover, it consumes less fuel, so it does have research potential. We are willing to support your research and development and invest hundreds of thousands of dollars in you without any problem, but we have to share your research results…” Ben-Jammin made the decision on the spot.

For Skunk Works right now, an investment of a few hundred thousand dollars is nothing. With the help of people from the East, they've opened up a new track, which is great!
"Yes, you're right. Shall we have oil-splashed noodles for dinner?"

"For the initial research and development, we're willing to support you with one million US dollars! Oh, and we can also upgrade these three computers for you free of charge, making them run faster, so that one computer can be freed up for pulse detonation engine research..."

The other party mentioned those three computers again!
Night fell, and Qin Liang and the others saw the foreigners off to their cars. Zhang Chongyang's face was gloomy; it seemed he was going to report them when he got back. However... with Zhonghangji, they could operate independently without having to worry about their attitudes!
"Liangzi, I need to go to the aero-engine department," Director Luo said. "A million dollars for research, why not take it? They shouldn't refuse..."

"Well, I have to go back. There's definitely something wrong with our computer!"

What?
Everyone's face darkened.

The parts were provided by Americans, and Qin Liang did the installation. What could possibly go wrong?
Previously, Qin Liang had been curious about why the operating system source code appeared on the computer. Now it seems... there's a reason for the source code's appearance. They must have modified the operating system program, meaning they left a backdoor in the background!

Fortunately, most computers in this era are not connected to the internet, otherwise foreigners could directly steal our secrets through the network. Now we can only use the excuse of upgrading!

Qin Liang's fingers flew across the keyboard, and he quickly discovered the problem: the actual capacity of the hard drive did not match the nominal capacity! This meant that the hard drive had a hidden partition!
"Found it! This hidden partition contains our program backups!"

"These Americans are definitely up to no good!"

"Yes, thankfully we've never let them touch the computer!"

"We can't let them touch the next upgrade! We'd rather not upgrade at all than let them steal our secrets!"

Hearing everyone's excited chatter, Qin Liang stood up with a smile and stretched: "Free upgrade? Of course we'll take it! But we can definitely modify this program backup. We can add a few infinite loops, and if that's not enough, we can add a low-level format of the hard drive..."

Everyone's eyes lit up; Qin Liang's idea was really good!

Clatter... Just then, the calculator in Qin Liang's pocket fell out.

"Liangzi, this calculator is a real treasure!" Professor Sha bent down to pick it up.

"Yeah, I bought dozens, one for everyone..."

"so much?"

"Yes, we'll probably be going to Factory 132 quite often from now on. If we need to do calculations, a calculator will be more convenient..."

Just then, a voice suddenly rang out from outside: "You five elements are really too strong! We're so envious! You're eating meat, can you give us four elements a sip of soup?"

(End of this chapter)