One hundred seconds countdown to primary and secondary separation.
One hundred seconds to prepare!
On the big screen, the red numbers on the countdown board kept flashing, reminding everyone that their work was about to officially begin. Although the first-stage rocket and the fairing would not land at Yatu Sea Landing Airport this time, there was still something about the first-stage rocket.
The remote control of the aircraft and fairing will be handed over to the Yatuhai Landing Site Command and Control Management Center.
Although this is a first-stage rocket body that has been successfully recovered six times, the measurement and control team in the command and control management center hall still dare not be careless. At this moment, they are watching the big screen with all their attention, paying attention to the various aspects of the main rocket.
Item data changes.
Normally, the first-stage rocket separates between one hundred and two hundred seconds. This is mainly based on the size of the first-stage rocket, which determines the amount of fuel, the thrust of the engine, and the orbital height to be launched, so a
The working time of the first-stage rocket also varies. For this mission, this first-stage rocket has to work for 167 seconds.
It takes almost three minutes, so during these three minutes, the entire measurement and control team needs to focus on the data information for fear of omissions and misinterpretations.
One minute to separate and prepare.
At this moment, the rocket has risen to a high altitude. Through the optical telemetry imaging screen, everyone can clearly see the rocket and the tail flame. In fact, at this altitude, the optical telemetry equipment has very limited ability to observe the rocket body, so during this process
The main thing is to observe the working status of the engine at the bottom of the first-stage rocket.
To put it simply, it is to observe the tail flame ejected from the engine. Under normal circumstances, the tail flame should tend to be stably burned and ejected without any fluctuations. Only when the engine fails, the tail flame ejected will naturally have an impact. This
It is extremely conspicuous in optical infrared observation equipment.
Thirty seconds!
Ten, nine, eight...three, two, one, one and two levels of separation.
With the announcement from the Northwest Space Launch Site, the successful separation of the first and second stages of the rocket can also be seen on the big screen.
Yatuhai, the first-stage rocket has successfully separated, and the control rights are handed over to you.
Yatuhai received it!
The large screen in the hall is divided into two halves. One half is the previous monitoring interface, including the Jianmu-2 rocket that has been successfully ignited and is continuing to rise with its load, as well as the various measurement and control data synchronously transmitted back from the Northwest Launch Site.
data.
The other half argued for the first-person view shot by the surveillance camera on the landing first-stage rocket body. In the picture, the rocket's grid plate was successfully opened, and the rocket began to be controlled to adjust its posture in the air, and then as shown below
Landing.
Further below is a yellow desert, and you can vaguely see the outlines of some towns, roads, and lakes. In the distance, there is a misty semicircular blue skyline, and further up there is a deep blue sky.
This time, the first-stage rocket body uses the latest improved technology, which is to get rid of the previous technical means of the first-stage rocket body of the Jianmu-2 rocket, which relied on parachutes to decelerate at medium and high altitudes.
This time, the first-stage rocket body of the Jianmu-2 T-type rocket has been upgraded and transformed, so that it can have the same characteristics as the first-stage rocket body of the Jianmu-7 rocket. During the entire return process, the rocket engine is ignited.
Recoil deceleration.
This change makes the return and landing of the first-stage rocket body more direct and does not require so many movements. In addition, it also saves the space and weight of the parachute bag, allowing it to carry more fuel and increase the overall rocket's carrying capacity.
And compared with other return-type reusable first-stage rockets, this first-stage rocket, including the new first-stage rocket of the Jianmu-7 series rockets, adopts a linear descent method that gradually decelerates. Simply put, the rocket’s
The engine does not start 100% from the beginning and then slow down the rocket.
That's not the case. The thrust of the rocket's vector engine may be only 5% at the beginning, and then as the landing height changes, the thrust increases little by little. When it is about fifty meters above the ground, the thrust reaches 100%.
Ninety-eight, then continue to accelerate, wait until it is one meter above the ground, the thrust rises to about 99.5%, and then slowly land, the rocket engine shuts down.
The advantage of doing this is to save fuel. It can greatly save the fuel consumption of the rocket during the landing process, and continuously decelerate the rocket at a minimum cost. Another big reason is that the speed is faster at the beginning.
It is convenient for the rocket to control its own landing attitude, avoid being affected by mid-to-high airflow, and can greatly shorten the entire landing time.
The No. 2 report from Landing Site No. 1 showed that the core first-stage rocket was 3,000 meters above the ground, the landing attitude was normal, the landing speed was normal, and the landing gear was open normally.
Yatuhai understands.
Landing site No. 1 reports that the landing site area is clean, the ground wind speed is one meter, the humidity is suitable, and landing is possible.
Yatuhai understands.
As the height of the first-stage rocket continues to decrease, the numbers on the big screen also continue to decrease, and the entire speed changes very quickly. In the blink of an eye, the height of the rocket from the ground is only a thousand meters.
At this time, two drones were hovering in the high altitude of the No. 1 landing site. Through the lens on the drone, you could watch the rocket during the entire landing process more closely.
The two drones also received the command and immediately flew towards the rapidly descending first-stage rocket.
Through the drone lens, everyone can clearly see that the grid wings on the first-stage rocket are constantly changing, controlling the rocket's flight attitude.
Five hundred meters, three hundred meters, one hundred meters!
The landing speed of the first-stage rocket body is getting slower and slower. Finally, the long tail flame ejected from the first-stage rocket body blows up dust on the ground, and the rocket is also covered by these flying desert dust.
The rocket slowly landed close to the ground. As a burst of white smoke rose, the first-stage rocket landed smoothly on the landing site.
OK, bang bang bang bang!
There was a burst of warm applause at the scene. For the entire first-stage rocket reward recovery and measurement and control team, their main task has been completed. Next, they only need to cooperate with the rocket recovery and transportation technical team on site to transport the first-stage rocket
The body can be transported to the rocket workshop at the northwest R&D base for maintenance, storage, and waiting for the next mission.
Wu Hao naturally took the lead in giving warm applause for completing the recovery mission of the first-stage rocket so beautifully. Yu Chengwu and others on the side also applauded when they saw this.
Just when everyone was laughing and admiring, the original first-stage rocket measurement and control screen on the big screen was switched. In the main window screen, two huge red and white parafoils were flying in space with two fairings.
stand up.
In a window screen, three orange helicopters have begun to hover in the sky, waiting for the target to arrive.