The old cat stood tall in a chair and lifted the Orion spaceship model over the top.

Tang Yue sat across from it, leaning on his back.

"At an altitude of one hundred and twenty-five kilometers, Orion II begins to change its attitude, and it will slow down like this...... Woohoo——! The old cat made an inexplicable onomatopoeia while spinning the model in its paws, "The failure of the first simulation test proved that our calculations were wrong, and I corrected the perturbation guidance algorithm, which can reduce the landing error ellipse of the spacecraft to less than 30km × 30km." ”

"Here is the entry point, I reconstructed the atmospheric model, and the aerodynamic parameters of Orion, and looked at the ...... Here's the entry point. The old cat said, letting the height of the model slowly decrease, "Boom——! Whew, hoohoo! Adjust the track angle and yaw angle! Whew——! ”

"In the thirty-ninth second after entering the atmosphere, the Thrust of Raptor-05 rises to 85%, and the GNC system controls the RCS to trim the Orion ......"

Tang Yue listened drowsily.

If it weren't for the old cat's startled onomatopoeia, he would have fallen asleep a long time ago, and every time he was about to take a nap, the old cat would have a "bang!" "Boom!" It popped up and made it look like the engine had exploded.

He was too tired too.

When the old cat corrected the flight control program of Orion, Tang Yue assisted Mai Dong to continue the modification of the spacecraft, emptied all the inflatable cabins on Orion, and then tied them to the outer wall of the Eagle lander.

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

Mai Dong finished reading the tens of thousands of columns on the form, hit his head on Ah Q's stomach, and sighed Tang Yue Do you want to murder me.

Tang Yue was helpless.

This life has to be done by two people, so it can't be regarded as a deliberate murder, it can only be said to be the same death.

The main purpose of the inflatable cabin on the Orion spacecraft is a warehouse, used to store supplies and experimental samples, these modules are quite large, more than ten meters in length, six meters in diameter, and an internal volume of 250 cubic meters, but the mass is very light - the biggest advantage of the inflatable cabin compared to the hard shell is that it is foldable and light, and the inflatable cabin of the Orion spacecraft is designed with a multi-layer structure, and the main materials are polyamide, polyethylene and Kevlar interwoven composite fabrics.

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

The old cat is ready to use them as the last cushion for the lander to land, because the balloons are big enough and strong enough, and the epoxy carbon fiber composite material is the main component of the cabin capsule, which has a tensile strength of more than one gigapascals.

The four inflatable cabins are tied to the outer wall of the lander, surrounded by airtight air up and down, left and right, which can provide effective protection for the lander, no matter what attitude the lander falls into, the first grounding must be the airbag, as long as they are not blown up at the moment of touching the ground, then the soft bulkhead will absorb most of the kinetic energy to ensure the safety of Mai Dong.

The old cat calculated that the stationary release limit height of the lander was two hundred meters.

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

Therefore, the Orion spacecraft must descend below the altitude of 200 meters above the surface.

Under Tang Yue's instructions, Mai Dong emptied all the irrelevant parts in the inflatable cabin, even the hard inner frame of the aluminum alloy was also removed, and there was a banging and banging, and finally only the basic structure of the airbag was left.

It took them all day.

From four o'clock in the morning to five o'clock in the afternoon, the two of them have not tossed the inflatable cabin, they are completely unfamiliar with its structure, the detailed drawings and maintenance manuals are still found by the old cat, and some parts in the construction project can not be dismantled.

Tang Yue tried his best to dispel the girl's idea of wanting to bite with her teeth in a hurry, coaxed her to rest, and then flipped through the maintenance manual page by page, consulted the old cat, and found a solution.

After emptying the inflatable chambers, how to tie up these 10-meter-long balloons is also a problem.

Tang Yue and Mai Dong discussed for a long time how to tie it most firmly, and at the same time rejected the old cat's suggestion.

Tortoiseshell binding is definitely not right.

Mai Dong and Tang Yue fell asleep while talking through the video, I don't know who fell asleep first-

"I said that this kind of binding is definitely not strong......"

"Then how do you think you should tie ......?"

"It should ...... How to tie it? ”

"How should I tie ......?"

"How should I tie it...... Hmmm......"

"Hmmm......"

"Hmmm......"

"Hmmm......"

Whoever fell asleep first, one of them must have been the first to become a repeater, and the next one became a repeater, and 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 Mai Dong have not rested much, the old cat seized the time to correct the program, and began to abuse the computer again, on the way Tang Yue slept briefly, from twelve o'clock last night to four o'clock this morning, less than four hours, got up and saw that the old cat was still abusing the computer.

After all, people are not iron, working for a long time and working at high intensity, and their spirits continue to be tense, Tang Yue and Mai Dong are a little unable to hold on, and Mai Dong is a little mentally weak.

"I improved the system's three-dimensional space guidance algorithm, and since Orion doesn't have a radar for geodetic, we still have to rely mainly on inertial navigation, and the GNC system is crucial." The old cat held the model to demonstrate, but Tang Yue didn't listen to a word of what it said.

Tang Yue supported his eyelids with his fingers, in a trance.

"Counting down to 78 seconds, Orion entered a state of constant landing, and after I corrected the flight procedure, its speed at this moment should be 119.5m/s." The old cat squatted down on the chair and lowered the altitude with both hands on the spaceship model, "The constant speed flight segment is over, and the spacecraft begins to slow down in the second stage...... Tang Yue? Are you listening? ”

"Huh?" Tang Yue yawned, "Yes." ”

"Boom!"

Tang Yue opened his eyes with a spirit, "What's wrong?" ”

"The engine thrust back with all its might, hovered at a height of five meters above the ground, and the lander disengaged within three seconds." The old cat slowly erected the model on the table, clicked, and stood steadily, "The landing was successful." ”

"This is the result of the second model?" Tang Yue rubbed his eyes.

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

·

·

·

Following.

Tang Yue held the report card of the second model in his hand, like a mourning exam.

The old cat's prediction of the second model is only the "boom!" "That's right.

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

"Old Cat ......"

"Don't talk! Don't say anything! I still don't believe it...... I'm the first cross talk master and algorithm architect and aerospace expert in the solar system, the most proficient feline in the feline, the only feline in the hand, I can't handle this thing? The old cat said viciously, "Don't worry! The second model is just collecting data, and from the point of view of the mission goal, we are considered a complete success, so there is no need to be frustrated! Three modes! The three models will definitely succeed! ”

"How sure is the three modes?"

The old cat drew flatbread on the floor with his foot.

"So big!"