At the Northwest Research Center Airport, Wu Hao's special plane landed on the runway smoothly. The cabin door opened, and a gust of cold wind blew in, causing Wu Hao to pass through his clothes involuntarily.

At this moment, the Northwest Research Center has been covered by a thin layer of snow, and there is a vast expanse of whiteness everywhere.

After encountering the cold wind from Siberia, the warm and humid air flow from the southeast gathered into precipitation here, and finally scattered into pieces of snowflakes.

The desert is not what people imagine. It also rains and snows here, but the annual evaporation is too large, and all the little precipitation is evaporated.

Of course, this is when it is warmer. At least in this long winter, the snow will always cover the entire desert because of the low temperature here. It will not be revealed until the ice and snow melt in the coming year, and this is also the reason for the rise of sandstorms every year. when.

As he walked down the hanging ladder, several people who had been waiting for a long time came up to greet him and surrounded him to block the fierce cold wind.

"Mr. Wu, you've worked hard all the way." Yu Chengwu said enthusiastically to Wu Hao. Wu Hao shook hands with him with a smile and said, "Didn't I tell you, don't pick me up, I'll just go directly. I'm already familiar with this place, so I won't get lost." Hehe, it's for us that you can come The biggest support, I must come to pick you up.

Besides, the test site this time is still more than 100 kilometers away from our base, and the road below will be a bit difficult.

Yu Chengwu smiled at Wu Hao and said. Oh, did you change the landing field? Wu Hao was a little surprised when he heard the words.

Yes. Yu Chengwu smiled and nodded and explained: "We will put two satellites into orbit for this launch, so the first half of the whole mission is a normal commercial payload launch, and our experiment will officially start only after the satellites are put into orbit. Previously, we only used the ground orbit test near the Karman line, but this time the orbital altitude of these two satellites is above 180 kilometers, which also means that our second-stage rocket will fly to this altitude Then, return to the atmosphere. So in order to save fuel, we must try our best to choose the landing site of the secondary rocket as far as possible to the far end of the launch trajectory, so that the secondary rocket can land better. But, generally The wreckage of the super rocket is more than 1,000 kilometers away from the launch, and they are basically located in places with relatively poor population. It is obviously not appropriate to set up a normalized fixed landing site. Therefore, we can only use the landing site , chose this kind of place that is open and uninhabited, and is relatively close to the far-end secondary splashdown point. Moreover, the new landing field is larger than our original landing field, which is more conducive to our landing and recovery work. In addition, It can also solve the safety problem in the recovery process of the second-stage rocket in the future. However, because this landing site is under construction, the current infrastructure has not been perfected, and even the road to the landing site has not been repaired. Let's go to At the landing site, we have to cross a section of desert dirt road, which may be a bit bumpy, please forgive me." What's the matter, I'm not made of tofu, so I'm afraid of bumps.

Wu Hao replied with a smile, and then said: "How is the preparation at the launch site? Although our main purpose this time is the return landing experiment of the second-stage rocket, after all, we still have to launch two satellites. , cannot be taken lightly." Please rest assured.

General Yu Cheng, Wu Hao, please get in the car, and then he got into the car and sat beside Wu Hao and said with a smile: "The rocket launch mission is our experienced and mature technical team, which has been responsible for more than a dozen large-scale launch missions before. , have all been successful. This time they are responsible for the launch mission, there should be no problem." Well, Wu Hao nodded with a smile, and then asked: "How is the preparation for the safety work? Lax, let alone be careless."

"Don't worry, we also attach great importance to this. In addition to the repeated inspection and demonstration experiments in the early stage, we have checked and calculated several times during the entire launch including the return and landing process, and prepared a lot of countermeasures accordingly. Once there is a problem, we will Immediately deal with it according to the plan to ensure that the entire launch and experiment process is foolproof. Of course, we are also prepared for the worst. Evacuate and clean up all personnel within tens of kilometers from the landing site, including the entire return and landing process , we will also monitor it in real time and track the flight status of the secondary rocket in real time. If necessary, we can also intercept it independently, or ask the Air Force Air Defense Force to help us intercept it, so as to ensure that the secondary rocket does not It will fly around and fall to other areas due to loss of control. Of course, this is the worst plan, and we will definitely not choose until the last moment." Yu Chengwu said with a smile at Wu Hao.

As for Wu Hao, he saw a trace of pressure and tension from his smile. You must know that this re-entry and landing test mission is very difficult, far more difficult than the technology of returning and landing a manned spacecraft.

Because the second-stage rocket increases the thrust-to-weight ratio in order to reduce weight and increase fuel, the entire structural material is relatively light, which also makes its strength far inferior to the return capsule of a manned spacecraft.

In the process of high-speed descent, especially during the high-speed friction of re-entry into the atmosphere, it is very likely that the entire rocket body will disintegrate in the atmosphere and burn out due to insufficient strength.

In addition, low and medium altitudes will also be affected by the airflow, so that the flight attitude, trajectory, and landing point launch will be offset during the period.

And this requires constant testing of the entire secondary rocket flight control system, which needs to monitor the flight attitude, trajectory, and estimated landing point of the secondary rocket in real time, and perform control corrections in real time.

In addition ~lightnovelpub.net~ The entire secondary rocket needs to decelerate multiple times in outer space, atmosphere, hollow, low altitude, and near the ground. This process is also very important, and it is directly related to whether the secondary rocket can be safe. A smooth return to landing landing.

If the speed is too slow, it is easy to consume fuel, causing the fuel of the second-stage rocket body to be exhausted before landing.

The deceleration that resulted in the later stage did not have much fuel support, and it also caused the speed to be too fast, causing the secondary rocket to crash.

Similarly, if the deceleration fails and the speed is too fast, then it is likely to disintegrate and burn directly in the atmosphere, or hit the ground directly like a warhead or a meteor.

Such a large arrow body, plus the remaining fuel in it, fell from such a high airspace at such a fast speed, and its power is very terrifying.

That's why he attached so much importance to the return and landing experiment of the second-stage rocket, and why he came to the scene to sit in charge in person.

Military technology