A big country of aerospace with black technology

The new launch mission is scheduled for the night of August 28th.

The location is still at the Xichang launch base.

Rocket components transferred from the manufacturing plant to the launch base by special train.

It is transferred to the test plant at the launch site by a special vehicle.

After the components are assembled and laid down in the test workshop.

The stage rockets and boosters, which are basically assembled, are transferred from the test plant to the launch tower.

Do the final assembly work.

But the closer to such a final critical moment, the more prone to problems.

The ancients said: half a hundred miles is ninety.

Now the launch mission of ChinaSat-8 has reached such a critical moment.

Even Zhang Xingyang, who never cared much about failure, felt a little nervous at this time.

After all, in the original history, this launch mission actually failed.

Although in the previous inspection, many possible problems were also detected.

But I still don't know whether this launch will be successful. The original problem is that the ignition and separation of the three-stage rocket engine failed, resulting in a failure to perform normal separation.

In the end, the satellite failed to enter orbit.

The inspection of the three-stage rocket engine was almost done by Zhang Xingyang himself, staring at them, and there must be no problems.

But who knows if there is something wrong with the rocket engine itself?

Maybe there is a problem with other systems?

No one knows the answer to these things. After all, the last rocket has fallen into the ocean, and it is difficult to trace the specific cause of the accident.

The hoisting work of the rocket is still going on in an orderly manner, and the people in charge of the rocket assembly work are veteran workers who have many times of rocket hoisting experience.

It is basically impossible for any accidents to happen, but Zhang Xingyang still couldn't help worrying about deviations during hoisting.

"Xing Yang, drink some water."

Su Xiao handed over a bottle of mineral water.

"Thanks."

Zhang Xingyang took the bottle and thanked him, but he didn't drink it immediately, but looked up at the rocket standing like a hill.

"Su Xiao, do you think we will succeed this time?"

Zhang Xingyang frowned, as if he was asking Su Xiao beside him, or asking himself.

"Everyone has put in a lot of hard work this time, and it will definitely be a success!"

Su Xiao didn't know the original ending of this rocket, so he was naturally more optimistic.

But Zhang Xingyang, who knows the development trend behind, is not so optimistic, but now that the rocket is on the launch pad, it is like an arrow on the bowstring, and it cannot be launched.

The workers who assemble the rocket move very quickly, and then the rocket is left with the last job to do.

That is to fuel the rocket.

The fuel used by the Changsan rocket is unsymmetrical dimethylhydrazine, a high-performance chemical propellant developed 20 or 30 years ago. It has a very high specific impulse, and it will automatically ignite when it comes into contact with an oxidizer.

Its conventional oxidizing agent is dinitrogen tetroxide.

Although unsymmetrical dimethylhydrazine has great advantages as a fuel agent, it also has a disadvantage that cannot be ignored.

That is, it is poisonous, and the toxicity is not small. It will be poisoned if it is slightly touched, and it has a certain risk of cancer.

This is also an important reason why the use of unsymmetrical dimethylhydrazine as fuel is gradually abandoned and aerospace kerosene is used as fuel.

Compared with the toxic and relatively expensive unsymmetrical dimethylhydrazine, the non-toxic and cheap aerospace kerosene is more favored by everyone.

Of course, the specific impulse of aerospace kerosene is also lower than that of unsymmetrical dimethylhydrazine, which is unavoidable.

After the fuel injection of the rocket is completed, everyone needs to evacuate the scene.

Especially after the last accident, within a relatively short period of time, the launch base no longer dared to let everyone stay closer to the rocket.

Unlike the last national live broadcast of the rocket launch, this time apart from several official newspapers, no other media were invited to report.

Rocket launch control center hall.

Everyone is nervously awaiting the launch time.

There was almost no sound in the vast hall, especially in the area around Zhang Xingyang, there were only bursts of silence.

Seeing such a chilling atmosphere at the scene, the few young reporters who came to report on the rocket launch didn't know what they should do.

It seems impossible to interview Zhang Xingyang, the center of attention of this launch.

So I had to turn to the staff who didn't look particularly busy.

"Hello, I would like to ask if you are confident in the success of this rocket launch?"

The little reporter holding the microphone, handed the microphone to Su Xiao's mouth and asked.

"Of course! This rocket launch will definitely be a success!"

Just when the little reporter smiled and was about to ask some more questions.

Zhang Xingyang said in a calm tone:

"Prepare in a minute!"

The control center seemed to hear the clarion call of the beginning of the war, and the state of war was activated.

Everyone is back at their jobs and ready to get to work!

The rocket launch tower began to slowly let go of the original shelf, allowing the rocket to stand independently on the launch pad.

"50 seconds!"

"40 seconds!"

"10!"

"9!"

"8!"

"3!"

"2!"

"1!"

"ignition!"

Following Zhang Xingyang, he pressed the red plastic button on the control panel.

The engine of the rocket standing on the launch pad started to work, ejecting jets of orange flames.

At this time, everyone in the control center had their hearts in their throats.

After all, the last time the rocket ignited, the accident that happened, it's hard not to make people have some bad associations.

"Xicheng, the optical tracking is normal!"

Xicheng is the first ground station that the rocket passes through during its launch.

The normality of the Xicheng report represents the initial launch stage of the rocket, and there have been no major accidents like the last time.

Everyone in the control center also breathed a sigh of relief at this time, only Zhang Xingyang was still not relieved.

After all, only he knows that the most critical time for this rocket is when the third stage is separated.

Along with a series of follow-up reports, everyone's expressions became more and more relaxed. Zhang Xingyang could even see a smile on someone's face, as if he had seen the success of this launch mission.

Only Zhang Xingyang was still frowning.

"Yuance 6, the radar tracking is normal!"

The rocket successfully entered the sky over the Eastern Ocean and entered the range of the ocean-going measurement and control ship.

"The separation of the first stage rocket is normal!"

Radar tracking showed that the first stage of the rocket had successfully separated, and the second stage rocket had completed its launch.

The more it came to this kind of time, Zhang Xingyang became nervous, and he could feel his heart beating non-stop.

It seems to be jumping out.

Fortunately, there were no problems with the secondary rocket.

"The separation of the secondary rocket is normal!"

With this reminder, Zhang Xingyang's heart reached its peak.

After all, it was here that the problem arose last time.