Vol 2 Chapter 2080: Jianmu-2 fully recovered launch vehicle

Zhou Xiangming opened his mouth and tried hard to say something, but in the end he shook his head and reluctantly responded: "Okay, when will they want it?"
This is not urgent, it will be enough to transport it to the capital together with the return cabin of Walker 4. Wu Hao said with a smile.
Hearing his words, Zhou Xiangming nodded, and then said to the two of them: "Mr. Wu, this kind of thing won't happen in the future. The return capsule of our Walker spacecraft is reused. If it is given to people like this, Then our loss is too great."
Don't worry, this kind of thing only happens once, we're not so generous, we take the spaceship as a gift to play with. Zhang Jun said. The two return cabins alone made Zhang Jun feel distressed, but he had no choice but to reluctantly give up.
Hearing his words, Zhou Xiangming, Yang Xiaoyun and the others were relieved, and then smiled and introduced some related exhibits in the hall. When walking in front of a uniquely shaped rocket, Wu Hao asked Zhou Xiangming, "This should be the Walker 2 fully recoverable launch vehicle. How is its research progress?"
The so-called fully recoverable launch vehicle means that all parts of the original rocket can be recovered, that is, all recovered and reused. Under normal circumstances, for recyclable and reusable rockets, generally only the first-stage rocket of the rocket can be returned to the landing, and then reused, thereby reducing the cost.
Later, people began to recycle the fairing of the rocket, which also greatly reduced the launch cost of the rocket.
In addition to the first stage rocket and fairing, there is currently no way to recover the second stage rocket, as well as the upper stage used to launch multiple satellites and special orbit satellites.
Among them, the upper stage can be ignored, because the upper stage can be regarded as part of the rocket or part of the satellite. It is called the space shuttle, which can be regarded as a special vehicle for satellite transportation and release. platform, or satellite.
Also because of this feature, the upper stage can be regarded as a kind of orbiter. After completing the relevant tasks, the best destination of this orbiter is to re-enter the atmosphere and burn up, and it has no recoverable value. Moreover, the cost of such an orbiter accounts for a very small part of the entire launch cost, which is basically negligible.
In contrast, the second-stage rocket still accounts for about 30 to 40 percent of the launch cost of the original rocket, which is the bulk. So for a long time, in fact, many launch vehicle companies have been studying how to recycle and reuse secondary rockets.
Wu Hao and the others are the same. They have been conducting research in this area. They have even conducted several experiments before and achieved certain results.
So he was very interested in the fully recovered Jianmu-2 rocket displayed. In fact, not only Wu Hao, but Zhang Jun and his entourage are also very interested.
Zhou Xiangming saw the expressions of interest on Wu Hao and the others, and immediately introduced with a smile: "You are right, this is our Jianmu-2 fully-recoverable launch vehicle. The model you see now, It is the 1:3 model of our Jianmu-2 fully recovered launch vehicle.
As the name suggests, the Jianmu-2 fully-recoverable launch vehicle means that all the main rockets can be recycled and reused, and the main part here is the secondary rocket.
Usually, the second-stage rocket is the most difficult to recover, because the second-stage rocket generally reaches space directly, and sends the satellite or spacecraft to orbit, which is the end of the work. What it works is the distance from the atmosphere to space.
If you want it to be recovered, you must first let it land. And this means that the second-stage rocket must return to the atmosphere, then undergo the harsh test of the atmosphere, and then land safely.
In this regard, its difficulty is actually the same as, or even more difficult than, the return landing of manned spacecraft, as well as space shuttles and returnable satellites. "
Speaking of which, Zhou Xiangming moved the crowd and led the crowd to the front of a large screen, and then slid the transparent folding tablet in his hand. Immediately, the related presentation pictures of the Jianmu-2 fully recovered launch vehicle appeared on the large screen.
"Why do you say this, because the structure of the second-stage rocket body is more special, and it mainly contains fuel, which accounts for more than 90% of the weight of the entire rocket body. If the rocket body itself is too heavy, It will greatly affect the filling of the fuel and the carrying capacity of the rocket. In fact, every kilogram of the weight of the rocket means that its carrying capacity is reduced by one kilogram. Therefore, the materials used in the current launch vehicle are They are all light materials. Of course, it is not to say that the lighter the better, but to ensure the strength while being light. If the strength of the rocket body is too low, it is easy to cause the rocket body to break, bend and deform, and even launch The process can not bear the huge pressure, and rupture and so on.
If it is only a one-time launch vehicle, considering the one-time use, there are naturally not so many requirements, so the relative requirements for materials are not so strict. However, for the rocket body to be recycled repeatedly, the requirements in this regard are relatively high. It should not only be as light as possible, but also have high strength, which can meet the pressure and pressure brought by multiple take-offs and landings. Shock ~EbookFREE.me~ In addition, the fuel tank inside it also has to bear the weight and pressure brought by filling the fuel multiple times, and the same is true for other pipelines, lines and systems. Not to mention the core of the rocket, the engine.
Wu Hao and the others have fulfilled these requirements, and have already handed in a very satisfactory answer sheet. But if applied to the second stage rocket, these technologies are far from enough.
Because the second-stage rocket not only has to be launched into space, but also has to return from space and travel back and forth through the atmosphere. This is even more demanding for the rocket body, which is why no company has completed the secondary rocket recovery experiment for so many years. "
"In order to solve this problem, we can imagine that we have researched many feasible solutions, and then, based on a little experiment, we finally selected a set of solutions that we think are feasible and meet our relevant needs in all aspects. Technical solutions."
Speaking of this, Zhou Xiangming changed a picture. In this picture, the secondary rocket of the Jianmu-2 fully recovered launch vehicle came out directly and displayed on the big screen from a full perspective.
"This is the second-stage rocket of the Jianmu-2 fully recovered launch vehicle that we developed. The biggest difference between it and the second-stage rocket of ordinary launch vehicles is that we have added a pair of cruise missiles to it. The wing structure on the wing projectile."
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