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The principle of this kind of foam insulation material is not to isolate heat. Its principle is to decompose it at high temperature and then use the decomposed parts to take away the heat, thereby preventing heat from accumulating on the surface of the object and causing temperature rise. Too high and burn the object to be protected.

After this layer of foam insulation material is sprayed, and after it is completely cured, another protective layer needs to be covered on the entire surface of the foam insulation material. The function of this protective layer is actually to protect the entire foam insulation material coating from scratches and damage, thereby ensuring that it can burn and decompose evenly in the atmosphere.

After wrapping it with this protective layer, the next step is to fix the gold meteorite core to a special frame. It is impossible for such a large and heavy gold meteorite star core to hit the return capsule.

So you can only use this special frame to fix it outside.

This framework can actually be regarded as an open return lander, which consists of two parts. The first is the frame part that fixes the gold meteorite star core. It is more like an alloy frame that presents a cube.

The gold meteorite star core can be fixed in it by bolting it together. Just like using a cube frame to fix a ball, the ball is fixed inside the cube by the frame.

It’s just that this framework is more complicated and is divided into two parts: the inner and outer parts. The inner layer is used to fix the gold meteorite core, while the outer layer is used to maintain the cube shape. When the return lander lands, it will fix the gold meteorite fixed inside. The star core plays a protective role.

The inner two-layer frame is directly connected by soft shock-absorbing retrograde, thus playing a certain role in preventing shock and sudden impact.

After the golden meteorite core is fixed in the frame, it will be transported to the landing descender and then connected to the lower part of the frame using bolts.

Why is it 17,000 meters? Because the lowest mountains on the moon reach that low. Therefore, theoretically, the highest orbit of the lunar spacecraft is not 17 kilometers away. It flies close to the mountain. If it takes a step back to lower its altitude, it may hit the mountain.

In fact, from that point of view, you can't think of it as a reusable launch vehicle or spacecraft. It is responsible for the mission of lunar evacuation. To put it bluntly, it is not the one that has not yet landed on the moon but has taken off and left the moon. process.

With everything ready, the landing descender also entered the launch countdown.

Therefore, the landing ascender of that spacecraft was not a technical verification model developed in accordance with the relevant technical standards for the reusable landing ascender responsible for the lunar exit mission in the future stepped manned system.

Inside the return capsule, in order to store fewer lunar resource samples and ensure that those samples could be safely transported back to Earth, a common design was adopted inside the capsule.

As the frame holding the gold meteorite core is fixed under the landing descender, the next step is to store the lunar resource samples collected by Wangshu 1 and Wangshu 7 after traveling thousands of kilometers into the landing descender. in the return capsule.

The traditional landing descender is disposable and cannot be discarded. As for Wu Hao, what we want is fewer repeated trips to the moon. If we use a one-time landing descender, the cost will be too low and it will be a waste of resources.

The biggest disadvantage of this is not to avoid wasting resources. The lander will stay on the moon and will lift off from the moon at the same time and retract and dock with the orbital thruster under the lunar orbit.

There may not be any intercontinental airliners on Earth that have a very low altitude. You must know that the flight altitude of some long-range intercontinental airliners can reach less than 18,000 meters.

Under the moon, that is the highest altitude that a spacecraft can fly around the moon.

The returnable lunar experimental spacecraft itself is not a technology experimental spacecraft, and the technologies used and tested on it are not prepared for early manned moon landings and small trips to the moon.

The containers containing collected lunar resource samples are actually like test tubes and small capsules.

That return capsule is like a small can. From the inside, it is actually very similar to other spacecraft return capsules, including manned return capsules.

But Yu Chengwu and Zhou Xiangming explained why we didn’t design it that way. It was actually not for experimentation and exploration of reusability.

The traditional lunar landing descender is actually not composed of two parts. One part is the lander, which is responsible for the mission of landing on the moon. There is no descender under the lander. Its main task is to carry the lunar landing personnel, or to Lunar rock and soil samples are launched from under the moon, return to the lunar orbit, and retract and dock with the orbital thruster.

Space shock-proof sponges are used to form spaces similar to a honeycomb structure in the cabin. Large test tubes or small capsules containing lunar resource samples will be fixed outside those empty spaces. In this way, using this structure, the test tubes containing the samples can be well protected from damage due to vibration during transportation, including landing.

And that frame, not the lower part of the return lander, is actually not a deceleration parachute package. Its function is not to use the deceleration parachute outside the deceleration parachute package to decelerate the frame with the golden meteorite core before returning to the earth's small atmosphere, so that it can descend and land at a more dangerous speed. UU reading ｗww.uukanshu.net Avoid the collision of the golden meteorite star core due to too slow speed.

The smallest disadvantage of doing so is waste, because when returning, the lander is no longer needed, so it cannot be discarded at all. This will not save a small amount of fuel, reduce the technical difficulty of launching from the moon, and at the same time also Little cost savings.

Therefore, those lunar resource samples were placed in a very long and orderly manner outside the special return capsule under the landing descender.

As for Wu Hao, the landing descender of our return-type lunar experimental spacecraft was actually integrated. It does not mean that it integrated the lander and the descender together, but that it had a retrograde separation design.

Next, it will lift off from the moon carrying gold meteorite cores and lunar resource samples, return to the lunar orbit, retract and dock with the orbital thruster parked under the lunar orbit, and then return to the earth together.

Although the Moon's gravity is relatively large, the Moon's highest orbital altitude is actually 17 kilometers away, not 17,000 meters.

Once all those samples are loaded, it also means that the mission of the landing descender of the returnable lunar experimental spacecraft on the moon will come to an end.

However, a landing descender developed using reusable technology and standard design like a launch vehicle cannot be reused a few times. In this case, the cost cannot be saved to a minimum, and the cost amortized to a single mission will be very low. .

There is no independent code under each test tube. Those codes record the information of those samples, such as the longitude and latitude coordinates collected, when they were collected, the depth of collection, conditions, status at the time of collection, etc., those will become Important data for studying the address evolution of that area of ​​the moon.

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