As the manned space base of Han, the scale of Yedao’s space city is getting bigger and bigger. In the future, Han’s space launch mission will mainly rely on the base here. After all, it is closer to the equator and can make better use of the earth’s rotation. Speed ​​and save fuel.

Now, on the launch pad, the Long March 2 bundled rocket stands quietly on it. Outside the fairing on the top, the brightly-colored Han national flag is extremely eye-catching.

The third manned space flight experiment is about to begin like this. Although it is somewhat dramatic, it is still acceptable if the overall situation is important.

"Mr. Ilyushenko, welcome to our space city." A tall Xiong country scientist, with a few assistants, entered the launch command hall of Han country. When he came in, the eyes of the Eagle people outside There was still aggrieved.

Why can Xiong people enter, but they can't? Now, if it is not for Han's technology, they really want to confront Han!

The Eagles cannot come in, but the Bears are fine. This is the result of everyone's negotiation. After all, this time the spacecraft is going to be docked with the bears space station.

Ilyushenko, a student of Korolev, a famous rocket expert in the country of Xiong, is also one of the designers of the Mir space station. As such an aerospace veteran, he is naturally arrogant. He is very proud of Han's aerospace technology. I didn't look down on it.

Hmph, the Han people can only imitate it. For example, the Han people’s current Shenzhou spacecraft is no different from Xiong’s Soyuz spacecraft. Ilyushenko despises such blatant imitations of Han, so , Now that he heard the welcome from Qin Guan in front, he still dismissed it, but then his eyes went wide.

"What is that?" Ilyushenko looked at the big screen on the wall.

"This is our main display," Qin Guan said. This screen is so tall that it occupies the entire wall of the launch hall. The rocket standing on it looks quite intuitive and realistic. Ilyushenko rubbed his eyes. Yes, even the details of the rocket can be seen clearly. Clearly Chu, their equipment is really advanced!

However, just a display device, it doesn't matter, this is just grandstanding.

"Please show our customers the track design." Qin Guan shouted.

The rocket on the big screen disappeared and switched to other interfaces. The whole screen was divided into two parts. On the left is a curve, marked with points, where it changes orbit, clearly, and on the right, it shows Is actually a three-dimensional schematic diagram of the orbit change. The earth is displayed by the principle of perspective. Each orbit of the spacecraft is marked with a different color, which is very clear!

Now there is a three-dimensional display, but this consumes a lot of computer resources. Therefore, for professional aerospace orbits, Xiong Guo adopts two-dimensional display. Anyway, they can understand it, but now, he hastily saw this The three-dimensional interface stunned him immediately. The computer performance here is more than a hundred times that of their space center, right?

"We asked you to come to coordinate this rescue plan. The most important thing is the docking. Therefore, I would like to ask you to verify whether our parameters are correct." Qin Guan said.

"Well, we're starting to work!" Ilyushenko yelled. They were all here to coordinate. They thought they needed to calculate together after they came here. How did they know that Han had already calculated it, they just needed It is enough to verify whether Han Guo’s calculation is wrong.

The assistants took out calculation tools from their pockets, including Ilyushenko himself, also took out the calculation tool that has been used all the time: slide rule!

Aerospace engineering, like other engineering, requires a lot of calculations. Before the invention of computers, slide rules were widely used for calculations.

Its calculation is quite fast and efficient. It can not only perform addition and subtraction, but also multiplication and division, which is much faster than calculations on paper, and it can also perform exponents, logarithms, trigonometric functions, square roots, etc. Waiting calculation is a must for engineers.

Ilyushenko's slide rule was given to him by Korolev. It is now polished and shiny, and many of the scales on it are not clear, but he is quite clear about every calculation.

This slide rule is composed of five straight bars, aligned in parallel and locked to each other, so that the middle bar can slide relative to the other two along the length. The two outer ones are fixed, making their relative positions unchanged. If you move the internal deficit, the scale will change to each other. When you reach the corresponding position, you can find the above calculation results. It is a very simple analog calculator.

Although their attitude was a bit arrogant just now, they are still meticulous in doing this kind of calculation. Looking at their calculations, Qin Guan couldn't help but speak: "Sorry, do you need this kind of thing?"

Slide rules were once widely used in China. The rockets were developed in those days. Even nuclear bombs were calculated by hand-cranked computers. But now, Han Guo has changed shotguns to the latest Hanxin. There are almost a handful of technology notebooks.

But now, seeing that their calculations were really troublesome, Qin Guan couldn't help but took out the calculator and gave them one for each.

Calculator, a very simple tool. There are many buttons on it, various numbers, addition, subtraction, multiplication and division, and it can also make voices. Advanced scientific calculators can perform complex calculations. There is a black and white LCD display on it. , Used to display the calculation results, and a small piece of solar battery to supplement electricity, this kind of calculator is just a small product of Hanxin Technology.

Seeing that Qin Guan took out the calculator, these visitors suddenly showed joyful eyes: "Need, need!"

In Xiong, the highest-level aerospace department is not equipped with calculators. Most people use slide rules. The Han engineers present showed their respect. They rely on these things to complete the aerospace engineering. It’s really not easy to make progress one by one and compete with Eagle Nation’s Star Wars plan.

In fact, calculators are only for temporary calculations at your fingertips. Everyone has a computer. Inputting programs in it makes calculations easier!

With a calculator, paper is needed. They worked there for half an hour to collect the information, and then Ilyushenko said to Qin Guan: "Yes, looking at it now, the orbital parameters are completely correct."

After speaking, he handed the calculator to Qin Guan: "I'll give you this back."

"No, let's send it to you." Qin Guan said.