Die on Mars

The old cat stood high on the chair and lifted the Orion spacecraft model above his head.

Tang Yue sat opposite it, with his arms and legs spread out.

"At an altitude of one hundred and twenty-five kilometers, Orion 2 begins to change its attitude. It will slow down like this... Whoosh whoosh!" The old cat pursed his lips and uttered incomprehensible onomatopoeia while spinning the model in his paws. , "The first simulation test failed, proving that our calculations were wrong. I corrected the perturbation guidance algorithm and can reduce the landing error ellipse of the spacecraft to within 30km × 30km."

"This is the entry point. I reconstructed the atmospheric model and Orion's aerodynamic parameter modeling. Look...this is the entry point." Old Cat said, slowly lowering the height of the model, "Boom——! Huh-huh-huh-huh! Adjust the track angle and yaw angle! Huh-huh--!"

"Thirty-nine seconds after entering the atmosphere, the Raptor-05 thrust increased to 85%, and the GNC system controlled the RCS to trim the Orion..."

Tang Yue felt drowsy after hearing this.

If it weren't for the old cat's startled onomatopoeia, he would have fallen asleep long ago. Every time he was about to take a nap, the old cat would say "Bang!" and "Boom!", making it look like an engine. exploded.

He was too tired.

While Lao Mao corrected Orion's flight control program, Tang Yue assisted Maidong in continuing to modify the spacecraft, emptying all the inflatable cabins on Orion and then tying them to the outer wall of the Eagle lander.

This workload is much greater than disassembling the Eagle lander, and the parts list is more than three meters long.

After reading the tens of thousands of columns on the form, Maidong bumped into Ah Q's stomach and sighed, "Tang Yue, do you want to murder me?"

Why should I murder your mother?

Tang Yue was helpless.

The two of them had to work together, so it couldn't be considered a deliberate murder. It could only be said that they died together.

The main purpose of the inflatable cabin on the Orion spacecraft is as a warehouse, used to store supplies and experimental samples. These cabin sections are quite large, with a length of more than ten meters, a diameter of six meters, and an internal volume of 250 cubic meters. However, The weight is very light - the biggest advantage of the inflatable cabin compared to the rigid shell is that it is foldable and lightweight. The inflatable cabin of the Orion spacecraft adopts a multi-layer structure design. The main material is a composite fabric interwoven with polyamide, polyethylene and Kevlar. .

This thin, flexible outer wall is only a few millimeters thick, and although it looks very fragile, it is far stronger than steel.

Laomao is prepared to use them as the final buffer for the lander when it lands, because these balloons are large enough and strong enough. Epoxy carbon fiber composite material is the main component of the capsule in the cabin, and its tensile strength exceeds one thousand megapascals.

The four inflatable cabins are tied to the outer wall of the lander and are airtight from top to bottom, left and right, which can provide effective protection for the lander. No matter what posture the lander falls in, the first thing to touch the ground will definitely be the air bags, as long as they do not touch the ground. If the ground explodes in an instant, the soft bulkhead will absorb most of the kinetic energy to ensure the safety of Ophiopogon japonicus.

Laomao has calculated that the lander's static release limit is two hundred meters.

As long as the height of the Eagle spacecraft when it leaves Orion is less than 200 meters, the airbag will not be exploded - if the dynamic pressure at the moment of impact is any higher, it will exceed the pressure relief valve limit of the airbag, and the air inside the inflatable cabin will not have time to be released. , it will pop like a balloon.

Therefore, the Orion spacecraft must land below two hundred meters above the surface.

Under Tang Yue's instructions, Maidong emptied out all the irrelevant parts in the inflatable cabin, even the hard inner frame of the aluminum alloy. After a while of knocking, only the basic structure of the airbag was left.

This took them all day.

From four o'clock in the morning to five o'clock in the afternoon, neither of them had messed with the inflatable cabin. They were completely unfamiliar with its structure. The detailed drawings and maintenance manuals were found by Lao Mao. Certain parts in the construction project were dismantled no matter how hard they were used. If you don't get down, these nail households are really annoying, and Ophiopogon japonicus is itching with hatred.

Tang Yue tried his best to dispel the girl's idea of ​​biting it in anger and coaxed her to rest. He flipped through the maintenance manual page by page and consulted the old cat before he found a solution.

After emptying the inflatable cabin, how to tie these ten-meter-long balloons is also a problem.

Tang Yue and Maidong discussed for a long time how to tie them the most firmly, and at the same time rejected Lao Mao's suggestion.

Tortoise shell binding is definitely wrong.

Maidong and Tang Yue fell asleep while talking over the video. I don’t know who fell asleep first——

"I said this binding method is definitely not strong..."

"Then how do you think it should be tied..."

"How...should be tied?"

"How should I tie..."

"How should I tie it...um..."

"Um……"

"Um……"

"Um……"

No matter who fell asleep first, one person must have turned into a repeater first, and then the other person also turned into a repeater. The two repeaters began an infinite loop of repeating each other until the power ran out.

Since the end of the first simulation test yesterday, Tang Yue and Maidong haven't had much rest. Lao Mao took the time to correct the program and started abusing the computer again. Tang Yue took a short nap on the way. From twelve o'clock last night to At four o'clock this morning, less than four hours later, I got up and saw that the old cat was still abusing the computer.

After all, people are not made of iron. After working at high intensity for a long time, their spirits continued to be tense. Both Tang Yue and Ophiopogon japonicus were a little unable to hold on, and Ophiopogon japonicus was a little mentally weak.

"I improved the system's three-dimensional space guidance algorithm. Since Orion does not have a geodesic radar, we mainly rely on inertial navigation. The GNC system is crucial." The old cat demonstrated with the model, but what it said was Tang Yue Not a word was heard.

Tang Yue held his eyelids with his fingers, feeling in a daze.

"Counting down 78 seconds, Orion has entered a state of constant speed landing. After I corrected the flight program, its speed at this moment should be 119.5m/s." Old Cat squatted down on the chair and held the spacecraft model with both hands to lower the altitude. "The constant speed flight segment is over. , the spacecraft begins to slow down in the second stage...Tang Yue? Are you listening?"

"Huh?" Tang Yue yawned, "Yes."

"boom!"

Tang Yue was startled and opened his eyes, "What's wrong?"

"The engine pushed back with all its strength and hovered at a height of five meters above the ground. The lander broke away within three seconds." Lao Mao slowly put the model upright on the table, clicked it, and stood firmly. "The landing was successful. "

"Is this the result of the second model?" Tang Yue rubbed his eyes.

"Yes, this must be the result of the second model!"

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The next day.

Tang Yue held the second model's transcript in his hand as if he was mourning for his heir.

Regarding the predicted outcome of the second model, only the "Boom!" was correct.

The Orion spacecraft once again fell on the threshold of 10,000 meters. The propellant tank ruptured, fuel leaked, caught fire and exploded.

"Old cat..."

"Stop talking! Don't say anything! I still don't believe it... I am the number one crosstalk master, algorithm architect and aerospace expert in the solar system. I am the best at telling jokes among cats. I am the only cat in the joke. I still can't figure this thing out?" Old Cat said fiercely, "Don't worry! The second model is just collecting data. From the perspective of the mission goal, we are considered a complete success. Don't be depressed! The third model! The third model will definitely succeed!"

"How sure are the three models?"

The old cat drew a pie on the floor with his feet.

"So big!"