I ask you to build tractors, but you build rockets?

Because all nearby areas were closed to air, Teng Yun broke through the speed of sound at an altitude of less than 10,000 meters. The entire city could hear huge noises from the sky, and then saw a white trail that was extending.

The ultimate hypersonic aerodynamic design allows Tengyun to accelerate very fast. The accompanying J-20B had to turn on the afterburner to keep up with it before it had time to take a few more photos.

However, this only lasted less than three minutes. After reaching more than 25,000 meters, Tengyun began to inject its own oxygen into the turbopump, causing the turbojet part of the engine to work in the maximum efficiency range and cool down strongly, leaving no power at all. Any attenuation due to increase in height.

The media photographers next to the airport on the ground had obviously never been to air shows. They lacked the experience of following airplanes and lost them several times. After a few minutes, they could only see a small, dim dot on the horizon, like a clear blue sky. Spots of chipped paint in the background.

Only the deafening sound of air explosions was still heard in the sky. Snow Hu had a supersonic silent design at the beginning, but Tengyun did not have this need, so its sound characteristics were extremely manic.

The general heading of Teng Yun is diagonally pointing to the southeast at the equator. This allows people in the south who missed the previous flight of snow swans to feel the shock of hypersonic flight, and it is more intense.

The Yuanwang-3 survey ship, which had already arrived, was even more eagerly awaiting it. They received the signal that Tengyun had taken off within ten minutes, and the radar had also discovered the target, but many crew members were waiting to hear the sound.

Finally, about sixteen minutes after takeoff, Tengyun had flown over their heads. At this time, the altitude was close to 72 kilometers, which was the final range of the turbofan mode.

Suddenly there was thunder like thunder in the endless sea and sky, as continuous as firecrackers. It took three minutes to completely disappear. The movement was not inferior to that of the rocket launch site, but it was weakened a lot by their place. No obvious vibrations can be felt on the hull.

However, unlike his irritability on the ground, Chang Lihai had the illusion that he was sitting in a simulation cabin, because the silence in the cabin was far less exaggerated than imagined.

Perhaps because he was worried about the vibration coupling problem caused by 10 engines, Serev specially worked hard on the cushioning. It was unusually quiet when flying at supersonic speeds in the atmosphere. Although it was still not small, it was far from the characteristics of a rocket.

However, this process only lasted about half an hour, and now the time is almost up.

Chang Lihai moved his body slightly to fit the unloading chair better, and confirmed on the radio:

“Our current speed is 4845m/s and altitude is 74900;

It will enter the air tip flight state in 30 seconds, so be ready! "

"clear!(!!)"

Chang Lihai pressed the button for switching the working mode, and then pulled the rudder back slightly until the pressed button lit up red.

This means that the elevation angle is manually confirmed to prepare for orbit entry, and the subsequent orbit entry process is left to the computer. Manual operation will only be used in emergencies.

And that is definitely one of the worst situations. Whether it is manual entry into orbit or return, it means that all electronic equipment is dead. In addition to the original mechanical-hydraulic control system, the driver can only rely on a mechanical navigator and assistant. The captain's naked eye observation was second only to Gagarin in difficulty.

After the computer interface entered, Chang Lihai's hand left the rudder, and the latter slowly retracted forward at the same time.

A few seconds later, the turbofan parts of the 10 engines cut off power at the same time. The original sense of acceleration came to an abrupt end. The entire cabin became quieter than ever before. Except for slight body vibrations transmitted through the sound insulation cotton, only the air conditioner was left. The whirring sound.

But all four astronauts immediately began to tense their muscles in preparation for the acceleration that followed.

It felt like a minute, but actually 15 seconds later, liquid oxygen was first pumped into the gas tip combustion chamber through the pipeline, followed by methane, and ignited naturally due to the high temperature of the converged nozzle.

The thrust of the rocket engine immediately made the astronauts feel the traditional sense of acceleration, but it was still much gentler than the rocket. Even at its highest, it would not exceed 2.5G. Any ordinary person who could fly a civil aviation airliner could bear it. For a complete set of equipment It is even more relaxed for the astronauts.

Chang Lihai turned his attention to the sky on the left. The sky below had turned into a deep blue, mixed with several huge cyclones. After ignoring them, it was almost the same as the normal flying ocean.

Only the sky was different from before. It was now infinitely close to black. The lower layer, which was dark blue just now, was now emitting a soft milky white light, covering up the brightness of the stars.

The height of the clouds continues to rise, and the elevation angle gradually decreases. Gradually, only the edge of the atmosphere can be seen in the scenery of the earth, and the rest is covered by stars.

After about six minutes, the engine stopped working.

Sunlight shines in through the portholes and passes through the masks of several astronauts in turn. This is because the body is rotating and the computer does not want direct sunlight to shine through the portholes.

The things in the porthole changed from the starry sky where the embryonic form had just been seen to the earth again, and now the entire aerospace plane was orbiting backwards.

The status indicator light on the console turned from red to green, and the force exerted on the astronauts by the unloading chair also disappeared, replaced by the feeling of weightlessness.

Chang Lihai gently unbuckled his seat belt, and then watched the rope and buckle fluttering wildly together.

30 minutes. In the past, he should have just arrived at the patrol area, but now he has crossed Hawaii and is patrolling the land at a higher and further place.

"Reporting to the commander-in-chief, I am Dongyao. I have arrived at the predetermined orbit. The flight is normal. The crew is in good condition. It is over."

…

At the B-level base, Lin Ju, who was trying to chat with the female assistant, had a message flash in his mind:

[A single-stage orbit-entry vehicle was detected entering low-Earth orbit, number of crew members: 4

Under the leadership of the system, your base successfully manufactured an aircraft that was of epoch-making significance in the history of aerospace, which will go down in history.

This is a great progress, which has made the cost of going to space drop by an order of magnitude again. The technical level of the aircraft is being evaluated... The evaluation is completed:

Comprehensive evaluation: Excellent. Although many of its processes and designs are not optimal, it actually takes into account cost and performance. It has higher durability than the pursuit of perfection, and is mature beyond the times.

Depending on your base's level of participation, you will receive the following rewards:

Academic paper: "A possible implementation method of quantum synchronous communication (authored by Jacky Cheung)"

Attachment: In order to solve the delay problem of interstellar communication, Jacky Cheung, the famous modern experimental physicist and one of the founders of quantum mechanics, published this article in 1954. He then spent 7 years to carry out related research, and successfully established the first human mission to Mars in 1969. The landing mission provided usable delay-free synchronous communication equipment and won the Hermann Meyer Prize in Physics that year.

Note: Long-distance synchronous communication based on quantum entanglement is of great help to the exploration of the universe, and in a sense is considered to be the prerequisite technology for interstellar travel. Please work hard to realize it. 】

"..."

"What's wrong?"

Yu Man felt the shoulder he was leaning on suddenly shake.

"Nothing...well, I almost forgot, it's just that the new technology has arrived, but I only gave a small change.

Damn, why is the world line where the technology comes from this time so crooked. "