Capital.

As soon as the Aviation Development Commission finished celebrating the Dawning 3, Lin Ju hurriedly flew over and asked for the Standing Committee to be convened.

Since the big guy also brought a few people to Huayin, the number of people present was not large, and for the time being, Academician She presided over the overall situation.

"Xiaolin, what are you going to be sure of in such a sudden meeting? What's so urgent? ”

Academician She has been very busy with things up and down the space bureau these days, and he is still yawning.

"I hope that the lunar orbital lander will be finalized as soon as possible, and the original cooperation plan no longer meets the future needs and should be abandoned."

"Oh?"

Academician She raised his eyebrows, the new reusable lander has been studied by the Fifth Academy for two or three months, and is about to enter the specific engineering design stage, and now it intends to overthrow?

"The base believes that this kind of small MTV is completely insufficient for the future large-scale construction of the moon, and the rocket configuration is also not conducive to equipment transportation and loading, so we simplified a configuration from that thing."

Lin Ju turned on the projector, and Academician She immediately recognized what the imaginary picture above was: XN-90, but now the code name written on the PPT is "XH-40".

"XH-40 (Hydrogen: hydrogen) landing spacecraft, with an empty weight of 40 tons, uses 4 25-ton closed-type expansion cycle hydrogen-oxygen engines in the abdomen and 2 in the tail, and uses the air tip working mode with a vacuum specific impulse of 470 seconds;

The maximum take-off mass is 350 tons, the uplink payload is 220 tons, and the downlink is 180 tons;

The width is 23 meters, the height is 39 meters, and the maximum height of the internal cargo compartment is 7.5 meters. ”

Academician She also knew that the secret project of XN90 was not too surprising to the appearance of XH40, but others didn't know, and suddenly their eyes widened when they saw this thing that was completely contrary to mainstream aircraft.

After a long time, someone spoke uncertainly:

"Vice Chairman Lin, this ...... XH40, isn't it a little too aggressive? ”

"Hey, there was a movie three years ago...... I remember, it's called Interstellar, and there's a lander in it that looks a lot like this thing, and it seems to be a plug-in engine. ”

"The 470-second air-tipped engine and the 0.63 load factor are really good, but the dead weight is a bit high, and the dry-mass ratio is more than 10......"

“……”

Several other committee members spontaneously discussed it, and Academician She was shocked for a moment and slowly thought of some of the advantages of this design.

The first is the landing attitude, the traditional lander engine part is installed in the tail section, which will cause the position of the load part to be too high, and it is still a small problem for personnel to climb up and down, but it is more troublesome for large equipment.

The XN40 is different, after landing, the tail or side hatch is opened, and it can be easily pulled out with a push of the trolley.

Another advantage is that the cargo compartment is more square and efficient, and the astronauts are more adaptable to the landing angle.

Of course, the most important thing is the strong carrying capacity, the uplink and downlink have a carrying capacity of nearly 200 tons, the traditional lander is completely incomparable, 6 volume-saving and high hydrogen-oxygen engines are installed on the outside and do not crowd the spacecraft internal space, and the powerful thrust of 100 tons in the vertical direction is also unprecedented.

Academician She approached Lin Ju and asked in a low voice:

"XN90 has eyebrows?"

Lin Ju: "The engine will have to wait for next year, but the prototype stress test of the spacecraft has almost been completed, this is a simplified and reduced version, because it does not require atmospheric take-off, the manufacturing difficulty and price are much cheaper, so we should build two demonstrators to practice first." ”

"And how long will it take for the XH40 to be built?"

"In November, the engine is the same as the air tip part of the TP-25, and it can be used immediately, and the fuselage can also copy the design of the 90, in fact, the base has now started."

“……”

Good guys, the construction of the base has already started before there is a result, and the efficiency of Xinyuan is indeed as high as ever.

At this time, the other committee members also discussed it more or less, but there were still some questions.

An expert from the First House raised his hand:

"Since XH-40 uses liquid hydrogen and liquid oxygen fuel, how to solve the problem of volatilization and boiling of liquid hydrogen in long-term storage?

I think it's supposed to stay in orbit for a long time, which is a big problem. ”

Lin Ju: "I think you should know a concept in the aerospace industry, zero evaporation storage technology. ”

The commissioners nodded, and any space agency that uses cryogenic fuel would be interested in such an idea.

"Then what I want to say now is that Xinyuan has solved this technology, and the first zero-evaporation liquid hydrogen storage tank has been installed on the fuel module of the 'Wutu' space station, and has performed well in the past half month of operation."

“……”

Seeing the incredulous gazes of the committee members, Lin Ju coughed and continued:

"We have not yet applied for relevant patents, but we are open to customization within the Aviation Development Commission, and this technology was developed by Seryov, and it was only recently successful, I hope you will try to keep it as confidential as possible."

Academician She thought about it, the power, body, and fuel storage were almost solved, and there was a more important thing to control...... There is no doubt about Xinyuan's intelligent technology, so look at the unexpected maturity of XH40?

But others are even more surprised by the silent emergence of zero-evaporation storage technology, a concept that has been extended from the last century to the present, and it is hard to believe that it has been easily made.

The ability to store liquid hydrogen for long periods of time is a remarkable technology, and the hottest fuel combination in the space industry in the past two years has been liquid oxygen methane, which is shown to be at the same storage temperature as liquid oxygen and easy to produce.

However, if liquid hydrogen can be stored for a long time, future deep space voyages can abandon the current normal temperature fuel combination and methane, and the impulse advantage of liquid hydrogen fuel in both conventional power and nuclear power is incomparable.

The committee's interest in this technology is higher than that of the XH40, which is simply a special shape, and it is okay to make anything in space without an atmosphere anyway, but the zero-evaporation storage technology is simply a big step forward for traditional astronautics.

So there is much less controversy about giving the XH40 the next-generation reusable lander, and basically no one opposes it.

However, Academician She left Lin Ju alone after the meeting.

"Have you tested this 25-ton closed-cycle expansion cycle engine?"

"Of course, we directly dismantled the ready-made TP25 modification, conducted a test run in a week, and started to build the official version this month."

Academician She nodded, and then said:

"I want to give the YF79-S code name to this engine."

Lin Ju was shocked: "But isn't the 101 Institute doing it, and YF79 should be more than halfway through, right?" ”

"But this is a repeated construction, all of them are 25-ton closed-type expansion cycle hydrogen and oxygen machines, and your is still in the air tip working mode, with a specific impulse of 470 seconds;

To tell the truth, the higher-ups are going to dismantle some people from the Academy of Nuclear Sciences and send them to the Space Agency to set up a nuclear propulsion 110 research institute, and the plug nozzle is more compatible with nuclear power, so they want to obtain some technology in this area from Xinyuan.

If the Sixth Academy can introduce this engine of yours and eat it thoroughly, it will save a lot of detours, and of course it will not make you suffer, and any conditions can be raised. ”

After the emergence of H2, the Academy of Sciences decided that the era of chemistry had come to an end and that nuclear propulsion must be vigorously developed, so it was ready to build a nuclear propulsion institute under the framework of the Space Agency, and the starting point was very high, aiming at the joint work mode of NPAE.

The nuclear research institute is confident in itself, but Xinyuan is the world's leader in terms of gas tip, and other countries are still suffering from the instability of the gas tip engine when working.

Now it seems that this technology can be obtained with the YF79S, which not only obtains the high-performance hydrogen and oxygen machine that can be used, but also gets the plug nozzle technology that you want.

Counting the YF100K and YF77G, this is the third engine that the space agency has "turned positive" from private spaceflight.

Lin Ju immediately nodded and agreed without hesitation, the development center of the base is shifting to nuclear power, and the importance of traditional engines has become less and less.

And is this another form of decentralization?

"Then we don't need money for this engine, let's change the conditions:

She Lao, I want some high-power laser technology, smelting satellite light source card here. ”

High-power lasers? Academician She thought about it and nodded:

"Yes, in fact, the light source of the smelting satellite can be completely customized, but you can do your own research, but this thing is not low."

Lin Ju made a very excited look, of course, the base doesn't actually need laser technology, now it's just a good excuse to take it out in the future.

(End of chapter)