Chapter 239 Question

"FGD, HGD?"

Lin Ju, who was still staying in Beijing, opened his mouth slightly and looked at the report reprinted in China.

On September 8, NACA announced that in the subsequent Artemis plan and manned Mars mission, artificial gravity spacecraft will be used, and the gravity can be freely adjusted between 0.3G and 1G.

Lin Ju, who had just seen these contents, was shocked, thinking that NACA had come up with some unknown black technology again, but...

Rope connection, free adjustment, this way of generating gravity is too simple!

Are there really astronauts willing to stay in a small jar and be tossed around?

The Orion spacecraft is fine, but what the hell is a starship.

The report also has an imaginary picture of Musk's two starships connected and rotated by ropes. Two things weighing more than a thousand tons are pulling each other, and the thickness of the rope is at most about the same as a baby's forearm.

Apart from anything else, the psychological endurance of astronauts riding this thing must be passed. It's sweaty to see that their lives are tied to a thin rope.

But strangely, the Aerospace Development Commission is quite optimistic about this plan.

Experts from the Fifth Academy immediately simulated their new generation of manned spacecraft. I dare not say much. A 100-meter flexible cable rotates at a speed of 2 circles per minute and generates 0.45G gravity without any problem. The most important thing is that it is low-cost.

Of course, in terms of style, FGD is not comparable to HGD, but it is really easy to implement, and there will be no difference in the gravity feeling of astronauts.

The Aerospace Development Commission even held a small discussion meeting to exchange ideas and explore whether there is any application space in China.

The boss first concluded: "In the early stages of the development of the aerospace industry, both flexible and rigid gravity devices have certain limitations. Flexible devices have lower requirements for technical strength and funds, but rigid centrifugal devices are the future."

This was unanimously agreed by everyone. If HGD continues on this path, as the diameter becomes larger and the weight becomes higher, it will be the only way for future space cities, and can even be used as a spacecraft for interstellar voyages.

Moreover, the rotating ring space composed of the cabin segment is also incomparable to the flexible device. The latter can only have two spacecraft at most, and its potential is limited. Unlike the former, the whole body structure can evenly share the load, and it can be very large, and it is very easy to make tens of thousands of tons.

Fifth Academy: "We have already participated in the Fram project, and there is no need to do FGD again."

"But FGD is very simple. We can do the experiment next year, and maybe it can be used on the moon."

"What if it succeeds? Can it be used for the first moon landing? We still have to wait, and Fram will be running by then."

"..."

Experts from various academies will be sent to the headquarters of the Aerospace Development Commission in turn, and they will jointly decide on certain things or conduct routine discussions with the people of the Beijing Space Administration. This kind of small meeting can be more relaxed because it does not involve specific decisions. It is actually quite interesting.

After a meeting, it was finally considered that FGD was too useless for the Fram space station that was already prepared for joint operation, so it was abandoned.

After the meeting, Lin Ju, the boss, Academician She and several experts stayed alone, as well as Shelev who had just flown from Xinyuan.

What they were going to discuss next was the space plane.

This is a project that both sides are hesitant about.

Now, the space agency will soon have a new generation of manned spacecraft + Long March 7 combination, and Xinyuan has H1 as the main means of transportation for personnel to and from.

No matter which one, the cost of each flight is more than tens of millions.

The space plane in the space agency's goal is the kind of artifact that can enter space and return intact without abandoning anything, and can reduce the cost of a single manned flight to less than 1 million.

The old Tengyun is not good, and the new Tengyun is not good either.

Once the participation of a rocket is required, it must be a high-specific impulse liquid oxygen and liquid hydrogen rocket. The fuel cost alone is more than this number, and the dead weight is extremely large, and it is difficult to store a large amount.

The problem of near space has been solved now. The WCR09 engine design is quite excellent, and it can carry a 100-ton space plane to an altitude of 50,000 to 60,000 meters. The trouble lies in the remaining section.

To cross the 100km Karman line and enter the low orbit of 200km, or 300, 400km, a liquid oxygen and liquid hydrogen engine that works for a long time is required, which brings a great increase in difficulty and cost.

Single-stage orbital entry is the direction that countless generations of astronauts have been working towards since the birth of rockets. From rockets to space planes, they have been exploring but have never succeeded.

Although Xinyuan's XN90 spacecraft can be achieved with the ultimate black technology NAPE, the cost is far from meeting the requirements.

Academician She looked at the equally young face next to Lin Ju, and he couldn't help but feel a little confused.

It was hard to accept that Shelev was directly appointed as vice president not long after graduation, and he was a technical talent. Management was okay, but technology, no matter what kind of genius, needs to be settled.

But he could only suppress his doubts in his heart. After all, his superiors had instructed: Don't say anything that is not conducive to unity.

Anyway, it's Lin Ju's private company, so he can do whatever he wants.

Academician She: "We have a plan here, which was proposed by Academician Ma Weimin. He is an expert in electromagnetics and is currently busy with some confidentiality work, but there are still some suggestions:

He suggested that perhaps an electromagnetic acceleration track could be built in a high-altitude area, with a length of about 50 kilometers, to accelerate the 20-ton space plane and small booster rocket to ultra-high speed, with the entire part not exceeding 40 tons, and then start the engine above near-space to enter orbit. "

Shelev: ...

Lin Ju: (⊙ｏ⊙)

Others: ...

Obviously, Academician Ma's plan is not very realistic. Just a 50-kilometer-long acceleration track, built in a high-altitude area, Lin Ju can already imagine the trillion-level construction funds.

Maybe Academician Ma is really busy, so he came up with a plan to make up the numbers...

Shelev: "I think this plan is good for the moon. A 5-kilometer-long acceleration track can directly put a manned spacecraft of about 5 tons or a cargo of about 10 tons into the near-moon orbit. Maybe it can be done before 2025. ”

Everyone understood what this meant by saying that the plan was impossible to achieve, and then the expert from the Third Academy coughed and said:

“The investment cost of this plan is indeed a bit high. Compared with it, I still think that the Tengyun Project has potential. Whether it is the second-stage orbital entry or the overall orbital entry with boosters, if we work hard, it can be done with about 10 million.

Both options can carry at least ten people, so the cost of a single flight is about 1 million, which is already low enough. If it is lower, I think it should be something that people in the future should do. ”

Shelev: “Hmm... (shakes his head)”

Shelev expressed his disapproval twice, focusing everyone's attention on this young man.

Among all the technicians on the scene, Shelev was too young to be looked down upon.

But Shelev himself felt that he was the same age as them and did not have any uncomfortable behavior.

He raised a finger and pointed out the first problem.

Getting up late...