Vol 4 Chapter 2366: Arrow Falls 9 Days (Medium)

Compared with the landing of the first stage rocket, the landing and recovery tasks of the two halves of the fairing are relatively much slower.
First of all, they rely on paragliders to decelerate, so their speed is relatively slow. Secondly, the fairing itself is a relatively large and light-weight object. When it falls down in the air, it will also encounter large air resistance, so as to achieve its own deceleration effect. This is like an iron ball of the same weight and a plate falling down at the same height at the same time. It must be the smaller iron ball that hits the ground first. The larger plate has air resistance, so the speed of descent will be slower. Much slower.
The recovery of the two halves of the fairing has been carried out dozens of times. At present, both the measurement and control team and the helicopter team on standby for recovery have accumulated very rich experience.
So for this process, everyone did not have much surprises, or the performance was calm.
I saw that the two halves of the fairing entered the predetermined positions one after the other, and the three helicopters immediately began to recover. A drone dragged the hook, and approached the paraglider with half of the fairing hanging from the back. Immediately after hooking, the tow hook was directly attached to the paraglider. The paraglider deforms and loses lift, resulting in a change in the attitude of the fairing below. As the helicopter was pulled up, the entire fairing was hung on the hook together with the paraglider, and then transferred by the helicopter to the landing site for unloading.
In the same recovery steps, another helicopter successfully hooked the paraglider on the other half of the fairing, and then hoisted the fairing and began to fly towards the landing site.
In this way, the recovery of the first-stage rocket and fairing has been completed. Let's look at the protagonist of this experiment, the performance of this second-stage rocket.
At this moment, the second-stage rocket has pushed the payload through the atmosphere and into space. On the big screen, you can clearly see the running state of the secondary rocket and its flight trajectory.
Now everyone is waiting for the last moment, staring at the countdown numbers on the big screen.
In the expectation of everyone, the broadcast that everyone is looking forward to came.
The secondary rocket is shut down and the components are separated!
clap clap clap...
In the command and control hall of the Northwest Launch Site, warm applause broke out instantly, and everyone in the hall stood up, applauding and cheering.
For them, most of the mission has been completed at this moment, and the launch mission has basically been completed. Next, it is necessary to control the upper stage to release the two satellites in the relevant orbits.
However, this is the work of satellite measurement and control, which is handled by a professional team. Wu Hao and the others don't have to worry about it. Now their eyes are focused on the second stage rocket.
Yatuhai, the second-stage rocket successfully completed the launch mission, and now the measurement and control rights are handed over to you, I wish you success!
Yatuhai understand, thank you, hard work!
The second-stage rocket attitude control engine engine is ready to fire for ten seconds!
Three, two, one, fire!
As the order was issued, on the large screen, the flight attitude of the second-stage rocket began to adjust. Before it was going up, now it needs to turn around and go down the same way it came.
This requires complex orbital attitude control, all relying on the small attitude engine on the secondary rocket. In fact, these attitude engines are not really aerospace engines, because of the special environment of space, what it ejects is compressed gas. The attitude is adjusted by the thrust of the compressed gas.
And it is those orbital control engines that really adjust the orbit. These orbital control engines will be responsible for the entire return journey of the secondary rocket in space.
Among the several window images are real-time images captured by several surveillance cameras above the secondary rocket. In the picture, the sky and the earth are turning, with the dark starry sky on one side and the bright blue earth on the other. The two are constantly changing their angles, indicating that the second-stage rocket is changing its orbit at the moment.
How long will the entire return landing process take? Wu Hao looked at the pictures and data parameters on the big screen, and then asked Yu Chengwu who was accompanying him.
Yu Chengwu replied with a smile: "The entire return process will take about thirty minutes."
So long, this one is much longer than the entire launch process. An accompanying girl who followed Wu Hao and the others said in surprise. But when he said it, he immediately covered his mouth, realizing that he had made a mistake and shouldn't speak out on such an occasion.
The girl glanced at Wu Hao and Yu Chengwu with a guilty conscience, and was about to breathe a sigh of relief, but she saw Shen Ning cast a serious look, which made her happiness go out again.
Hearing the girl's question, Wu Hao and Yu Chengwu smiled. Wu Hao glanced at the girl, and then said to Yu Chengwu, "Every girl has asked, so please explain it to everyone."
OK, then I'll say it. Yu Chengwu found a ballpoint pen on the table, and then gestured to the girl and everyone: "Establishing this ballpoint pen is the second stage rocket in space at the moment, what we are doing now is to turn it in one direction, and then let it Fly back along the trajectory you just ascended.
When it flies to the predetermined position, we need to reverse the orbit again, let it slowly descend, and then start to pass through the atmosphere.
During this process, because of the dense atmosphere, the flying wings on the secondary rocket will automatically bounce off. Then, under the action of the lift of the flying wing, the falling speed of the secondary rocket will continue to decelerate, and then rely on the flying wing to start a long-term glide in the atmosphere.
After reaching the predetermined airspace and altitude, a parachute will be thrown from the top of the secondary rocket. This parachute can not only continuously decelerate the secondary rocket, but also adjust the attitude of the rocket, so that the rocket can move from a to the rocket. In the gliding state, it becomes a parabola and is a downward trajectory.
After adjusting the attitude of the second-stage rocket, the tail displacement engine ignited, and then gradually decelerated, landing smoothly and slowly like the first-stage rocket just now. So this will cause the entire landing process to be much slower than the launch process. "
"Is it so complicated!" Seeing that things were already like this~EbookFREE.me~, the girl became even bolder.
"Haha, aerospace engineering itself is a complex project, and there are no more complicated and difficult projects." Yu Chengwu replied with a smile.
The girl wanted to say a few more words, but when she saw Shen Ning's stern gaze, she immediately gave up her thoughts and stopped talking.
As for Wu Hao, he waved his hand at Shen Ning with a slight smile, indicating that he was fine, then turned his head to look at the big screen.
Compared with this difference, he is obviously more concerned about the secondary rocket in space.
At this moment, the attitude adjustment of the second-stage rocket has been completed, and it is starting to descend along the preset trajectory.
In the hall of the command and control management center of the Yatuhai landing site, it was quiet, and everyone was concentrating on the big screen, for fear of missing any moment.
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