Mai Dong got into the Eagle lander, closed the hatch of the interface, sat down in the commander's chair, fastened his seat belt, closed the porthole baffles one by one, and the light dimmed.

"Mr. Cat, am I going to test it in a cabin suit?"

"I was wearing my cabin suit first." The old cat replied, "The current plan is quite rough, and there are still many details that need to be modified and adjusted. ”

"I see." Mai Dong leaned back in his chair and tightened his seat belt, "Then what do I need to do?" ”

"Wait for our good news." The old cat said, "Miss Maidon, this is the only thing you need to do. ”

During the official landing, 90% of the work will be done by the computer and the Orion spacecraft, and the remaining 10% will be done by Tang Yue and the old cat, and Mai Dong only needs to stay in the lander and try to protect himself.

There is no doubt that the flight control program that has just been released is just a prototype, and it is not mature, and the old cat does not expect to succeed at one time, the simulation test is trial and error, and the problem is constantly corrected, and the problem is solved until it can take on the heavy responsibility and bring the Mai Dong seat belt down.

The old cat stood facing the wall with its paws on its back.

Half of the inner wall of Kunlun Station is covered with manuscript paper, the paper is full of dense calculations and graphics, these are all the results of the work of Lao Mao and Tang Yue, in the past few days of making a landing plan, Kunlun Station has completely become an aerospace engineering research institute, one person and one cat repeatedly and fiercely argue about every small detail of the plan, often fighting and scolding, they draw and calculate on the white paper, and then paste the scratch paper on the wall, and the decimal point can be discussed until late at night.

Later, Tang Yue called this wall "Goddard's Wall".

Mai Dong has never seen this wall because all the sweat is behind the camera.

Since graduating from college, Tang Yue has never studied physics as hard as he does today, and he has been making up for orbital mechanics for a while, just to be able to understand what this ghost-only cat is saying.

At first, he was pressed to the ground by the old cat and rubbed.

Now Tang Yue can finally fight back.

Then the old cat pressed it to the ground and rubbed it.

Knowledge changes destiny.

The ancients were honest and did not deceive me.

Xuan doesn't save the wrong, Krypton doesn't change his life.

The ancients were more sincere and did not deceive me.

The old cat stretched out his paw and tore a piece of scratch paper.

"Bernoulli's equation."

It folded the paper into a paper airplane and threw it with its claws.

The white paper airplane floated up in the warm wind spit out by the OGS cabinet, swirled in the hall of Kunlun Station, and the height slowly decreased, it silently crossed the chairs on the floor, over the messy desktop, over the horizontal and vertical displays, over the chassis of the workstation, and turned into a whistling Orion spaceship in the eyes of the old cat, at a high speed of more than three kilometers per second, it crossed the horizon of the Martian land and flew towards the rising vast dawn!

"Orion landing program, the first mock test, start now!"

·

·

·

"This is the Orion Landing Plan Command Center, please answer when the lander hears it." Tang Yue was sitting in a dangerous spaceship, although there were only two people in Kunlun Station, there was still a sense of tension in the ground operation control hall of Jiuquan Center, it may be that the space in Kunlun Station was too small and there were too many sundries, so it seemed crowded and oppressive.

"Lander received."

The communication system of the Eagle spacecraft has been completely dismantled, and Mai Dong is currently communicating with the Kunlun station through the Orion spacecraft, which is the only channel of communication between the two sides when it actually lands, and the communication will be maintained until the Orion spacecraft crashes.

"How's the signal? Can I hear clearly? ”

"Very clear." Mai Dong replied.

"Okay, Mai Dong I'll repeat the plan again, you don't have to do anything until the timer starts." Tang Yue advised, "The first twelve and a half minutes after the timing starts, that is, the first seven hundred and forty-five seconds, you don't have to do anything, and at the seventh hundred and forty-fifth second, the computer or we will prompt you to disengage the operation, do you remember the essentials of the disengagement operation?" ”

"First left and then right."

"Yes, remember, left first, then right." Tang Yue nodded, "In case the computer fails, you also have to have your own timer, synchronize the timing, and you have to keep an eye on the time." ”

Mai Dong raised his right hand, and the electronic watch on his wrist was beating.

"I'll take it."

"Very well, at the 750th second, we will prompt you to leave, in case you don't receive any prompt at that time, remember, after five seconds, you will leave on your own!"

"Five seconds."

"Five seconds." Tang Yue said, "You have already understood all the steps, and then we are going to let you into the atmosphere, girl, good luck to you, and good luck to us." ”

After speaking, Tang Yue switched the communication channel and entered the working state.

"The Orion system goes into EDL mode."

"The GNC system is fine."

"The engine is in normal condition."

"The fault distribution rate of supply system components is 66.47%, the fault distribution rate of hot components is 12.80%, the fault distribution rate of control and regulation components is 2.17%, the fault propagation time of gas generator is 0.02 seconds, the error detection rate is 0.99995, and the initial parameter input is completed."

According to the calculations of the workstation, the entire landing process took 12 minutes and 56 seconds from beginning to end, spanning an altitude of 127 kilometers, and on average, 160 meters per second, less than Mach 1, which is an acceptable figure.

The dismantling of the Orion spacecraft is not yet complete, so far, Mai Dong has only unloaded the three stages of the Orion service module, but in the simulation test, the landed spacecraft will be completely complete - all the service modules and power modules have been removed, and it will be lightly equipped to face the most serious challenges with the most perfect attitude.

Tang Yue and Lao Mao have already entered the parameters, and this virtual spaceship composed of codes and numbers will be tested for re-entry.

"Are you ready?" Tang Yue asked.

"Hmm." Mai Dong nodded.

"Raptor-05 starts, engine throttling." The old cat tapped the keyboard, "Orion turned, and began to slow down." ”

In the memory of the HP workstation, the Orion II's Raptor engine ignited, methane mixed with liquid oxygen burned, and the nozzle spewed out a scorching high-speed jet, and the spacecraft began to turn and slow down.

"The orbital height is 375512 meters!"

"Orbital altitude 370,470 meters!"

"The orbital height is 398953 meters!"

Mai Dong sat in the lander, the surroundings were very quiet, there was no vibration or roar, the United Space Station was still operating normally in orbit, only the hurried voices of Tang Yue and the old cat sounded alternately in the headphones, they seemed to be using their voices to star in a tense radio drama, Mai Dong felt inexplicably relieved, the person and the cat used their shoulders to help her carry the weight of the entire Orion.

It is conceivable that in Kunlun Station, Tang Yue and the old cat were nervous, trying their best to control the Orion spaceship, although it was only a virtual spaceship, it might be carrying the weight of life.

"The combustion pressure is 40MPa, the nozzle pressure drop is 24.7MPa, and the pressure sensor is normal."

"The mixing ratio is 3.12, the methane flow is 7.24, and the coolant flow is 8.2...... The turbine pump power is reduced by 10 percent. ”

Tang Yue and Lao Mao sat on either side, and the two of them were monitoring part of the data of the Orion spacecraft, which was lowering its orbit and preparing to enter the atmosphere in the simulated environment of the workstation.

There were no images on the monitor, only numbers jumping rapidly, and the old cat and Tang Yue stared at them tightly, sketching out the state of the spaceship in their minds.

Orion slowly lowers in altitude.

Minutes and seconds passed.

Mai Dong sat in the seat of the commander of the lander, looking at the darkness in front of him, thinking about the tail flames of the spacecraft engine and the vast Martian land.

"The orbital height is 135,670 meters." Tang Yue said.

"The orbit height is 128012 meters, the speed is 4965 meters per second, Orion enters the landing corridor, passes the first waypoint, all departments pay attention, old cats pay attention!"

"Roger, throttle valve is normal, pressure sensor is normal, gas-liquid circulation is normal, Raptor-01, Raptor-03, Raptor-05, Raptor-07, Raptor-09 ready-"

"The orbit height is 127989 meters, and all departments pay attention, Orion enters the landing corridor and successfully passes the second waypoint." Tang Yue's voice became higher and higher.

"Raptor-01, Raptor-03, Raptor-05, Raptor-07, Raptor-09, Ignition Countdown ——!"

"The height of the track is 127746 meters! Attention departments, Orion enters the landing corridor! Pass the second waypoint! ”

"Orbital altitude 127,300 meters!" Tang Yue stared at the screen, the orbital altitude of the spaceship dropped all the way, and he secretly pinched a handful of sweat, there were still three hundred meters.

The model is very important, and it is said that the score of the model is the closest to the college entrance examination, Tang Yue does not know whether the results of this exam can really represent the final result.

Mai Dong raised her right hand in the lander, the electronic watch glowed blue in the dark, and she pressed the button to enter the countdown state.

"The orbital altitude is 127,000 meters! Old cat! ”

"Units are on fire! The countdown starts in 776 seconds! The old cat slapped the ignition button and gave the engine a start command, and the signal transmission was not even delayed in the simulation test, and at the moment when the old cat gave the order, the five engines of the Orion spacecraft let out a roar, and the huge thrust changed its attitude in an instant, and Orion entered the Martian atmosphere vertically, towards the predetermined landing site - the Ihidi Plain, and the Kunlun station plunged headlong.