There are no surprises,

Yang Xiaoman was scolded again, although Xu Mang had already persuaded him, but the effect of persuasion was that Xiaoman was scolded even worse, and almost Yang's mother staged a scene of righteous annihilation, but fortunately, at this time, Yang's father came, which prevented the tragedy.

soon

Everyone went to work, leaving Xu Mang alone in the ward, enjoying the rare quiet, in fact, he didn't have anything to do, he just wanted to stay here for a few days, although sleeping here would make Xiao Man physically and mentally exhausted, but he could enjoy her gentle care.

Xu Mang, who was lying on the bed, crossed Erlang's legs, thought for a long time, and finally decided to make a call to Zhang Ju of the Space Agency to inform him of his current situation.

"Hello?"

"Zhang Ju... So what... I was hospitalized. Xu Mang said seriously: "I have to take a leave of absence for a while, it's okay... The body is stiff, that is, the walking is thinking about how to scale the Mars rover proportionally according to the requirements of the indicators, and he is too engrossed in thinking about it, and he falls into the sewer. ”

"yes!"

"No way... I'm the kind of person who makes it easy to get on the job. Xu Mang sighed and said helplessly: "What... Can I not come back? When the time comes, I will send the materials directly to the mailbox of Academician Jin at the Mars Engineering Center?"

"Good!"

"Thank you... Zhang Ju. ”

syllable

Hanging up the phone, Xu Mang breathed a sigh of relief, he finally got it done, and gave Xiaoman a surprise at night!

“...”

"Forget it... At noon, she came to deliver food and told her. Xu Mang shook the hospital bed into a sitting mode, and then the bed dining table was propped up, and he began his own work journey to reduce the weight of the rover.

According to technical standards, the life span of the Mars rover is two Martian years, and the Mars orbit period is 687 days, that is, the service life is 1,374 days.

Curiosity was designed to last a Martian year, but he's still working, and Curiosity only landed on Mars seven years ago.

In terms of power, Xu Mang directly uses NASA's multi-mission radioisotope thermoelectric generator, which is actually a nuclear battery, a heat source filled with plutonium-238 dioxide and a set of solid thermocouples, which can convert the heat energy generated by plutonium-238 into electricity.

It will last almost 14 years, but Xu Mang's nuclear battery is slightly larger than NASA's, so that it can run more devices at the same time.

The rest,

It is simply to move the accessory equipment to the top and control the weight at the same time.

Bang bang bang,

suddenly

There was a quick knock on the door, and then a middle-aged man walked in, with a smile that he didn't understand, and just when Xu Mang felt confused, the stranger was followed by a large number of doctors.

"Professor Xu!"

"Are you okay?" the person who came was the director of this hospital, when he heard that Yang Mu said that Xu Mang was hospitalized, he hurriedly gathered a large number of elite doctors, and then came to Xu Mang's ward, he would not miss such a great opportunity.

“...”

"Are you?" Xu Mang asked with a confused face, "You are the director of this hospital, right? In fact, I didn't have anything to do, I just scratched a little skin, I don't need to use such a position, it's a bit of a waste of public resources. ”

"No waste!"

"In contrast, if Professor Xu has a problem, it is called waste. When Dean Li saw that Xu Mang was working, he couldn't help frowning, and said seriously: "Professor Xu... What you need most right now is rest, not working hard. ”

"Oh..."

"Anyway, can you leave for a while?" Xu Mang said with a smile: "These materials in my hands, if you see and say it, you may be sentenced to prison, starting with five years, with no upper limit... If it's serious, you'll die. ”

moment

Everyone is gone, and most people think that Xu Mang is not joking, and at his level, it is estimated that his hands are full of confidential projects.

"Professor Xu?"

"Do you need to change the ward?" Dean Li did not leave, but stood by the window, turned his back to Xu Mang and asked, "Our hospital has a special cadre ward, which is suitable for recuperation and living, if you need it, I will transfer it for you." ”

"No..."

"I'm just an ordinary person, and I can't afford to go to that kind of cadre ward. Xu Mang said indifferently, "Is there anything else going on with Dean Li?"

“...”

Then Professor Xu took a slow rest, and if there was anything needed, he spoke directly. Dean Li didn't stay long, and chose to leave directly, if he was a simple university professor, he wouldn't be quiet, but this person's surname was Xu, and his single name was gone.

The room was calm again,

rise

Locked

Xu Mang continued to alleviate the problem of counterweights about the rover.

In one morning, about 70% of the work was completed, and the remaining 30% was self-rescue equipment and sky cranes, which is a pity... NASA did not give Xu Mang any drawings for the design of the two key devices.

According to the information given by Academician Jin, they originally used the lander's thrust reverser engine to buffer and slowly reward on the surface of Mars, which is similar to the previous lunar landing plan, but how far is the Earth to the moon and how far is it from Mars, the two are simply incomparable.

Thinking about it,

In the end, the sky crane equipment was chosen.

According to a few pictures on the Internet, Xu Mang has a rough understanding of the so-called sky crane, and thus also understands how Curiosity landed on Mars, and after entering the atmosphere first, it will throw away its heat shield and back shell with the help of a large parachute to slow down the descent.

Then the sky crane is used to slowly descend, and the sky crane uses the cable to send the rover to the surface of Mars, and finally it flies away...

in a word

Complex!

But this was a guarantee for the equipment, and almost no impact of the landing undermined the equipment on the hull.

"Hello?"

"Academician Kim... Yes, yes, it's out of the way. Xu Mang received a call from Academician Jin and said with a smile: "Speaking of Academician Jin, I read your information, and I suddenly came up with a bold landing plan, how about learning NASA's sky crane landing method?"

“...”

"It's too complicated!" Academician Jin said seriously, "If something goes wrong, who can afford to take this responsibility?"

Xu Mang opened his mouth, but found that he couldn't speak, thought for a long time, and finally said: "NASA also used this sky crane landing method for the first time, and they succeeded... I think we can too!"

"I'll take this responsibility!" Xu Mang said solemnly: "I'll be responsible!"

In a flash

There was silence on the other end of the line.

"Professor Xu..."

"Are you sure?" Academician Jin asked, "From entering the atmosphere to landing, it takes less than ten minutes in total, can you grasp that there are no accidents during this period of time?"

"Yes!"

Academician Jin is caught in a contradiction, this is not an ordinary matter, it is easy to crash, if you accidentally make a mistake or if any detail is not handled well, it will become a laughing stock all over the world, and the media in the Western world will not sympathize with you.

"Xu Mang!"

"I hope you can think again, if it fails, those Western media will not sympathize with you, but will fall into the ground. Academician Jin said: "You have dealt with them many times, you should know their routines." ”

Xu Mang smiled and said indifferently, "I understand... However, I think that the Sky Crane landing method is the most reliable method at present, and if the method of landing on the moon is adopted, the impact force will destroy the equipment on it. ”

"That's right. ”

"The rover I designed is nuclear-powered. Xu Mang said with a smile: "There is a multi-task radioisotope thermoelectric generator on it, and the design service life is twenty years. ”

Hearing Xu Mang's words,

Academician Jin was stunned for a moment, and asked curiously, "You... How did you get to grips with it?"

"Hey, hey!"

"Anyway, I will, don't ask why... To ask is not to know. Xu Mang smiled: "Academician Jin... Give it a try, I promise in my honor that nothing will happen. ”

“...”

"I need to discuss it with Zhang Ju, how about giving you an answer tomorrow?" Academician Jin said.

"Oh..."

syllable

Hang up.

Xu Mang sighed, he could understand why Academician Jin was so cautious, after all, no one could guarantee that in the process of landing, there would be any problems, once it appeared... That would be fatal and cause irreparable damage.

"Ugh..."

"It's so stressful!" Xu Mang sighed, thinking that his goal was the sea of stars, this was just landing on Mars, what should I do if I landed on a more distant star in the future?

...

Nasa

Academician Jin came to Zhang Ju's office, and after a call to enter, he walked into the room.

"Huh?"

"Old Jin, why are you here?" Zhang Ju saw Academician Jin and asked curiously, "Did you encounter any problems?"

Academician Jin shook his head and said solemnly: "Xu Mang and I had a phone call just now, and he proposed a very bold and complex landing method, which uses the same sky crane landing method as NASA. ”

"What?"

"How to land the sky crane?" Zhang Ju was stunned for a moment, and was silent for a moment, then raised his head after ten seconds and asked, "Is he sure?"

"I don't know. ”

"But... Even if you are sure, from the atmosphere to the landing, in this short period of less than ten minutes, who can guarantee that there will be no problems?" Academician Jin sighed: "As long as a detail is not done, it will be a catastrophic consequence. ”

Oh, yes!

All the hard work of the past few years has come to naught, and the investment of tens of billions has also been wasted.

What to do?

According to the general situation, Zhang Ju will not agree to the so-called sky crane landing method, but if the proposer of this plan is Xu Mang, it needs to be carefully considered.

"That's right. ”

"He said he would take all the consequences. Academician Jin said: "Zhang Ju... What do you think?"

Time

Zhang Ju didn't know what to do, and this decision was too difficult to choose.

"Since..."

"We gave him the rover mission, so we have to trust him unconditionally. Zhang Ju said: "I agree to adopt his method. ”

......