Voyage of the Stars

"Battleship?" Gao Kun was stunned. Since he had not yet shifted from the positioning of the Callisto base, he really did not think about the battleship, mainly because he did not realize that the Callisto survivors were now an independent group.

Yue Yuan didn't know what Gao Kun was thinking. He nodded and said: "Yes, the existence of alien civilization is an indisputable fact. As an independent civilization, we definitely need battleships to protect ourselves. However, we will discuss this matter later. Let’s talk about the spaceship first. With our current technology, is it feasible to build such a spaceship that can accommodate everyone?”

"Not feasible!"

"feasible!"

Gao Kun and Yu Nanfeng almost answered together again, but their answers were different.

Gao Kun, the dean of the design institute, was the first to explain: "I believe you, Mr. Yue, also know that when building a large turntable spaceship, the smaller its radius, the greater the Coriolis force we will receive. If we want people to almost feel Without the Coriolis force, we would have to build a very large turntable, but we can’t build a spaceship that big.”

Gao Kun has done ship design before on Earth, including the design of large cruise ships, large transport ships, and even some medium-sized cruisers, so he is familiar with ship manufacturing.

"First of all, the larger the spacecraft, the greater its mass. We don't have such a powerful propulsion system. Even if we use multiple fission boilers, it will be difficult to meet long-term long-distance voyages due to fuel carrying problems." As he spoke, Gao Kun said He pulled up the chair in front of the workbench, sat down and continued to tell Yue Yuan.

"Secondly, the larger the spacecraft is, the more complex the internal structure and layout will be and the more fragile the main structure will be. Therefore, it is impossible to build a large spacecraft on the surface of the planet. Yes, we have the ability to build a space dock in the synchronous orbit of Callisto, but this way As a result, the cost and time-consuming will definitely become three to five times more than building on the surface of the planet.

Moreover, due to material strength issues, the main thruster of this large turntable-type spacecraft can only be mounted on the central axis. As a result, it may be difficult to propel such a huge spacecraft with our current fission thrusters. "

"No, no, no." At this time, Yu Nanfeng, who was leaning on his desk, interrupted: "Dean Gao, please don't take it out of context. Who said we want to build a big turntable? What we want to build is a big cylinder, a coaxial big circle Barrel. I have checked with Dr. Xu Zhenyi before. If we make a large barrel spacecraft, the material strength is no problem. In addition to installing the main thruster on the central axis, we can also install a ring of auxiliary thrusters on the outer wall of the large barrel to fully power the barrel. enough."

Yue Yuan interrupted: "Have you ever calculated the weight of such a large spaceship?"

"We calculated during the design process that the overall mass of the large barrel spacecraft is about 50 million tons." Yu Nanfeng answered.

"This is as massive as a small asteroid, can we push it?" Yue Yuan raised his eyebrows and looked at Yu Nanfeng.

This guy has a PhD in engineering mechanics and an expert in missile dynamics. Yue Yuan believes that he must have figured out this problem.

Yu Nanfeng thought for a moment and said: "It can be pushed. As long as there are enough thrusters, powerful force will do wonders. We have calculated that if every secondary shaft is equipped with thrusters, theoretically we are fully capable of pushing the spacecraft to the speed of light." 1%, but the acceleration time is a little longer.”

"how long?"

"Thirty years."

I go to this is a little longer?

Yue Yuan pressed his temples with a headache. He accelerated for thirty years, then decelerated for another thirty years. Those sixty years would have passed. How many sixty years can there be in life?

Based on the current average human lifespan of ninety years, just one acceleration and deceleration stage will consume all your life.

"We have a hibernation cabin. Most of the people spend the voyage in hibernation, so it's not a big problem." Yu Nanfeng added.

"Okay, do you include the mass of the massive hibernating cabins?" Yue Yuan put down his arm.

"Of course." Yu Nanfeng patted his chest, looking confident.

Yue Yuanchen stood up and walked around the office of the design institute twice, then returned to the two of them and said again: "How big is a spaceship that can accommodate more than 80,000 people? Well, we also need to include some reserved redundant space. Let’s talk about this plan in detail.”

Seeing that Yue Yuan was inclined to build a large spaceship, although Gao Kun was unwilling to do so, he had the sense not to interrupt and talk about the multi-spaceship plan. In fact, he also understands that battleship-type spacecraft cannot solve the problem of gravity effects, and this problem is related to the development of a new generation of humans, and it is indeed too fatal.

Magnetic boots can only solve the problem of walking, but cannot make people feel the effect of gravity as a whole.

"Two hundred and ninety-four!" At this time, Yu Nanfeng first raised three fingers and said a number, and then continued to explain: "We know that people on rotating objects will be affected by the Coriolis force, causing dizziness. Symptoms such as dizziness and nausea, but as long as the angular speed of the rotating object is slow enough, the adverse effects of the Coriolis force on people can be ignored. This speed is 2 rpm, which is 2 revolutions per minute."

"So for the big barrel spacecraft we built, we only need to keep its rotation speed below two revolutions per minute. To keep the spacecraft at such a low rotation speed and generate a gravity equivalent to the earth, then the radius of the spacecraft It has to be at least two hundred and ninety-four meters.”

"That is to say, as long as we place the living cabins three hundred meters away from the center of the rotating axis, we will not feel dizzy and nauseated.

And another advantage of such a spacecraft is that all the habitation compartments are at the same length as the axis and have the same linear speed. Therefore, it is equivalent to all living on the equator of the earth. The movement of objects along the entire line is It will not be affected by the geostrophic deflection force. "

"Slight gravity deviations cannot be felt by humans, so the habitation module can not only be at 294 meters, but can also extend slightly outward for about 50 meters. The gravitational acceleration experienced further outside will exceed 11.5 hours.

Of course, we can fine-tune it up and down, and then reduce the speed a little bit, and then keep the gravity acceleration of the innermost living cabin and the outermost living cabin within a range where the human body cannot feel much difference, which is probably 9.3m/s on the inner side and 11.3m/s on the outer side. m/s, so that we have a construction height of 60 meters. "

In Yu Nanfeng's description, a large barrel or large cylindrical spacecraft gradually appeared in Yue Yuan's mind.

The centermost rotation axis of the spacecraft is made of high-strength special alloy. Extending outward from the central axis are wide rotation arms. Because of the spacecraft's propulsion issues, these arms will be designed to be flat, just like thickening. The tire spokes are the same.

Along the direction of the long column, the rotating turntable of the spacecraft is divided into multiple synchronized segments. It's like putting N tires on a coaxial axis, and the sidewalls of the tires are the living cabins.

Asking for votes and investment...Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh, in this chapter the spacecraft rotation angular velocity, radius, centripetal force and other parameters are calculated incorrectly, but after careful calculation several times, the difference is not very big, the radius and rotational speed are within the realization range, I won’t change the specific values, as long as everyone understands the meaning.