I ask you to build tractors, but you build rockets?

35 billion to 45 billion. This is the space agency’s assessment of the development and manufacturing costs of the Advance space station.

The space agency is extremely excited about such a man-made product that can be used as both a super-large space station and a spaceship. The superiors are also very interested in such a huge man-made product, and have specially approved 20 billion yuan. If they can jointly operate the Advance space station, they can Directly contribute half of the funds.

Of course, this 20 billion is not direct money, but part of it is funding, and part of it is the space agency participating in manufacturing some of the modules according to its own ideas.

Speaking of this, Lin Ju felt that it was not a big problem.

Xinyuan is strong in aerospace technology, but it lacks high-precision scientific research equipment. It has always been buying, and developing it by itself is very energy-consuming.

Cooperating with the space agency will provide more channels for obtaining cutting-edge scientific research equipment.

Lin Ju: "Let's do this. All six crew cabins will be manufactured by Xinyuan, and half of the service cabin will be filled with your equipment and requirements. But I have a condition. The progress must be fast. The Qianjin space station should be built around October next year. finished."

"so fast?"

"As you know, most of the conditions that limit spaceflight are transportation capacity. We have achieved most of the automation in the cabin section and the efficiency is very high."

Academician She sighed again. The advantage of treating aerospace as a general industry is that it can reduce costs. SpecaX and XAP are both examples in this regard.

"The cooperation with the Qianjin is roughly like this. The Fifth Academy will have the energy to discuss the details with you at the end of the year. By the way, is your Xinyuan 4 still in development? Is the 3rd enough? 247 tons of low-Earth orbit transportation capacity , it’s really unprecedented.”

"No. 4? Maybe. The 800-ton low-Earth orbit transport capacity is indeed too exaggerated. It is all hard-roofed with hydrogen and oxygen machines. The cost is too expensive."

…

"I never thought that one day we would be able to use a solid booster with such a large thrust. It is a perfect match for a hydrogen-oxygen machine."

In the desert base, a gray long building was built outside the launch tower in the Gobi Desert. A 47-meter-long white object with a diameter of 5 meters lies on a V-shaped cement fixing groove, and is fastened by multiple strong giant expansion screws. Firmly fixed.

This is a solid rocket booster, the kind intended for the Xinyuan 4 super giant rocket.

As a violent product of the system, the SRB has a single-stage thrust of 700 tons. The S700 is expensive, but it is really worth it.

This 47-meter booster connects three S700 sections in series, with a total thrust of an astonishing 2,100 tons!

If two rockets are tied to any rocket, the thrust will directly increase by 4,200 tons!

If two cables are tied to Xinyuan 3, the LEO transport capacity can be increased from 247 tons to 324 tons, a direct increase of 77 tons.

Not to mention that solid thrusters are rocket artifacts. They can increase transportation capacity simply and violently. The classic way of using them is to use high-thrust solid thrusters as boosters, paired with core-stage small-thrust high-specific-impact hydrogen-oxygen engines.

The high-thrust fixed thruster will find a way to send the core stage out of the atmosphere, and then the high-specific-impulse hydrogen-oxygen engine will send the rocket into orbit. There is no need to develop a high-thrust liquid engine.

The only drawback is that it is too expensive. Although the casing can be dropped into the sea and fished out for reuse, the most valuable thing about solid rockets is not the casing.

However, the S2100 in the desert base is not used to build rockets, but is planned to be a launcher for the unmanned version of H1, which is the New Shenlong project.

The SL-1A was deployed in space for three months and returned to the ground the day before yesterday for maintenance and airframe inspection.

The performance of this hastily modified prototype is very good. It has high power generation and strong maneuverability. It has been tested that it can operate continuously in space for about one year without any problems.

Moreover, the internal volume brought by the lifting body fuselage is also very large. After several months of preparation, the base is preparing to deeply modify the SL-1A, fill it with equipment, and have practical combat capabilities.

The most important one is an 80KW laser, which charges the capacitor through the solar panel and then stores the energy to launch an attack. Taking into account heat dissipation and charging, it can be activated once in 15 minutes at the fastest.

Lasers of this power can already cause significant damage to satellites. When the base prepares to send SL-1A up next time, it will conduct an experiment with a "Fengyun" satellite that is about to be scrapped to see if it can be destroyed.

In addition, the manipulator has not fallen down. If the Fengyun satellite is really destroyed, it can be diverted and captured into the narrow cargo hold of the New Shenlong, and brought back to Earth to study the damage effect.

Although little is known about the X37B, Desert Base believes that the H1 has surpassed the former in terms of combat effectiveness and can be deployed in actual combat.

Actual deployment means building about four aircraft in small batches first, and then using solid rockets as strategic duty equipment, which can be launched quickly.

The 20-ton weight of the H1 is too heavy and requires medium and large liquid rockets to be launched. Its preparation time and launch site requirements are far from meeting combat readiness standards.

Although there is currently no war in which the SL-1A may be used, it does not mean that such preparations are unnecessary. In a sense, the importance of the SL-1A is on the same level as that of nuclear bombs.

Four SL-1As are enough to destroy most enemy satellites before the fuel is exhausted. Missile strikes against satellites are far less efficient and much more expensive.

However, the problem with the standing deployment of SL-1A is that there are no super-large solid rockets available. In fact, if a pure solid rocket is to be used to reach a 20-ton payload to low orbit, the requirements for rocket push and pull force are much higher than that of liquid rockets.

At first, the desert base wanted to find the Fourth Institute to develop a single-body rocket, with three-stage solid and one-stage liquid rocket. A total of four-stage rockets would send the SL-1A into space. The four-stage rocket would be added before launch. Liquid fuel saves time.

But after Guo Shen heard about it, he directly took out the S700, a great artifact, and decided to work hard to create a miracle.

A three-stage solid rocket, three S700 sections are connected in series, with a thrust of 2,100 tons and a dead weight of 1,000 tons. The second stage is coupled with a small solid rocket motor, and the two stages are put into orbit.

There is no skill, pure force can produce miracles, it is almost a single stage into orbit, using the powerful thrust of the S2100 to forcefully send the SL-1A under 25 tons into space. The solid push of the two-stage rocket only needs to work for a short time. Just throw it away after use, it's not too expensive.

Because the vibration was too great, the S2100 was transported to the desert base in the cargo bay with the 1250 installed for testing. At that time, the solid rocket experts from the Fourth Institute gasped when they saw this thing.

The Fourth Institute also has its own high-thrust solid rocket engine plan, with a diameter of 3.35 meters and a single-stage thrust of 500 tons (the original world line will be successful in 2022), which is still in the early stages of the project.

The S700 has a diameter of 5.05 meters and a single-stage thrust of 700 tons. It is simply an unimaginable giant.

When the base ordered the ignition test run, the S2100 started, and the internal star-shaped cavity grain began to burn from the inside out. The entire shell was the combustion chamber and engine of the solid rocket.

Even though they were hiding in the underground control room, the violent thrust of more than 2,000 tons when the S2100 was started almost tore the earth apart. People underground could clearly feel that the earth was shaking. The smoke column of the S2100 was so big that within a few seconds It covered the entire test site, rolled up yellow sand all over the sky, and mixed with the gray smoke, which was particularly spectacular.