Tower Defense Strategy

"Tower Defense Strategy (!

The madman is still studying secretly, planning unknown actions, but the world will not wait for him. Every day, human beings move forward.

After two months of use and improvement, country C upgraded three 3.35-meter-caliber electromagnetic orbital launchers in September to match the orbital changes of future space stations.

On September 20, country C used rockets to help a small country near the sea, which is separated by a country, to destroy a small monster of the first level. At the same time, the country initiated the upgrade of the future space station in accordance with one of the response plans for the development of the black sheep. action.

Certain changes were made to the early plans, and country C finally decided to use the future space station to directly hunt down the asteroid "Developer One" that had a revised orbit and stayed at an altitude of 500 kilometers.

The name of Developer One was changed after manual changes.

There have been many things, and finally the international community generally agreed to include artificially mined asteroids in another naming system. Developer One was the first asteroid to be renamed.

The other is the icy asteroid "Supplyer One" sponsored by West Central.

There was a small problem in the capture of Supplyman One.

After the asteroid passed through the atmosphere, after the catcher succeeded in pursuing it, in the first acceleration stage, there was a situation where the grabber detached...that is, the ice was broken.

In this accident, the trap and asteroid lost a large amount of ΔV (velocity variable caused by the propulsion), and the end velocity after the orbit change was completed was two hundred meters per second longer than expected.

Two hundred meters per second does not seem to be much, and the result is that the far point of the asteroid is more than two thousand kilometers away from the surface.

Sending the subsequent replenishment fuel to the elliptical orbit to complete the docking requires a Homan transfer maneuver with a longer time span, and the fuel consumption is greater than that of a circular orbit.

But this is not the point. The point is that the Tuqiu people have not accumulated enough experience in chasing elliptical orbit targets for rockets launched on the surface, and various preparations are difficult to simplify, so the fuel supply speed is much slower, and it is expected to be revised at the end of October. A circular orbit with an altitude of 500 kilometers.

In short, this upgrade has nothing to do with Supply One.

After several rounds of fuel replenishment and two maneuvers, the orbit of Developer One has been adjusted to an altitude orbit of 500 kilometers, with an inclination angle of about octave to the equatorial plane of the earth ball.

There is a point of knowledge here.

When an aircraft is closer to the planet, its speed is higher, and the fuel used to adjust the inclination angle will be more. The fuel used to adjust the octave inclination angle is even enough to raise or lower its orbit by hundreds of kilometers. .

In pursuit, there is no need to separate the inclination adjustment and the ascent, just calculate the direction and angle directly, and the acceleration is finished.

After two major maneuvers and several fine adjustments within two seconds, the future space station came 100 kilometers behind Developer One.

At this time, the height difference between the two is one kilometer, which means that the orbit circle of the future space station will be smaller.

Since it orbits the same planet, the influence of gravity is the same, and the speed of the smaller orbit circle will be slightly faster, so it can catch up without worrying about it. The actual amount of maneuvering required is only one kilometer in altitude.

The natural pursuit takes more than ten days. At this time, the future space station is already working.

By the way, I want to introduce the situation of the future space station at this time.

After confirming the death of the black sheep, country C sent the first batch of personnel dispatched to the future space station back to the ground in batches for training and treatment.

Now in the space station, there are only four original full-time astronauts from country C, two astronauts from country R, ​​and one research astronaut from country F and country Ita.

During the pursuit, there are two tasks.

First, adjust the propeller manually to achieve a fixed attitude of the asteroid.

For this task, the propeller must be split into four propulsion units and installed in different positions on the asteroid. The specific positioning also needs the assistance of exploration equipment and ground supercomputing.

Second, after completing the adjustment of the asteroid's attitude, set the "dock anchor point".

The so-called docking anchor point is a device that supports the future space station and collides with asteroids at a speed of less than 0.2 msec. Of course, it must have a lock.

The future space station is now a monster of several hundred tons, not much lighter than an asteroid. Even a low-speed collision will test the structural stability very much.

The mission was selected in the pursuit phase, mainly for safety reasons, no one knows whether some fragments will be broken out if the asteroid is moved manually or not. Although the relative speed of the two is very low, the power of the fragments is also limited, but it is a risk after all.

Using a three-ton spacecraft section (escape capsule) to carry out preliminary work between the two will not consume more fuel than pushing the future space station twice. Even if there is a serious accident, at most two spacecraft will be lost. member.

It's not that astronauts are worthless, but that compared to the entire future space station, astronauts are more adventurous and more acceptable.

Although Maozi astronaut is very carefree, but in times of crisis, sometimes he does need to be reckless...Of course, the reason cannot be said so bluntly.

Anyway, the two National R astronauts are in the two action groups, and one National C astronaut is grouped to perform the first stage of the thruster separation and resetting work.

It took seven days, eleven sorties of manned spacecraft, and more than 100 hours of exit operations, before completing the first phase of the mission.

Three spacesuits were scrapped at this stage, all of which were cut by splashes. Fortunately, they were all experienced astronauts. They were handled properly and there was no air leakage that caused the pilot to drift away and die.

At this time, there is still a large pile of asteroid thrusters, including more than 20 exhausted fuel and oxidizer tanks, a dozen thrusters, and a core frame and docking structure with a volume of tens of cubic meters.

You don't need to worry about these, after the docking, it will belong to the resources of the future space station.

The second phase of the mission was smoother. The anchor device that had been assembled in advance was sent to the asteroid. The two groups of astronauts worked together to complete the mission after two rounds of out of the cabin.

Back to the future space station, there are rare days of rest. At this time, the space station does not need to perform any operations to avoid affecting the docking accuracy.

On October 5th, there were more than a thousand meters left in the straight-line distance between the future space station and the asteroid. The attitude was confirmed and the propulsion started.

At a distance of 20 meters from the asteroid, four of the eight astronauts exited the cabin, all equipped with propulsion backpacks to assist outside the cabin.

At 11 o'clock in the morning of the same day, the first manned space station in human history completed docking and fixing with an asteroid!

The two Homo sapiens staying in the future space station watched the whole show...Because the task is too important and the complexity is high, the ground simulation results of the Homo sapiens robot cannot meet the requirements. The main reason is the hardware.

After a brief and warm celebration on the ground, people and supplies began to be sent to the space station again.

The real space metallurgy is about to begin next.

The previous vacuum processing equipment trial operation, and some subsequent space construction work, used finished metal ingots, but this time it should start with ore.

From ore to metallurgy to cold rolling and hot rolling, a lot of water is needed.

In this regard, the information provided by the aliens did not give a direct answer.

But Tuqiu people are not mentally retarded. On the one hand, they have the results of previous aerospace scientific research, and their basic knowledge of celestial bodies is much higher than that of decades ago. Sufficient, it contains the water and oxygen that the asteroid comes with.

The main component of iron asteroids is iron, but after floating in space for billions of years, it will inevitably capture some other substances, including but not limited to gaseous substances such as methane, small ice crystals, and carbon dioxide.

Is the little ice crystal gaseous?

Of course not, asteroids mainly capture gaseous and ionic substances, and some hydrogen and oxygen particles will become small ice crystals after being captured.

In short, asteroids contain a certain proportion of carbon, hydrogen and oxygen, and the light and radiation resources in space are unlimited. These things can be easily converted into various useful materials in space, including water, oxygen, graphite and even Simple battery and so on.

With the quality of Developer One, even if it was hit by a missile earlier, the remaining useful ingredients are still more than 100 tons, which can be used to save tens of billions of surface funds.

In order to make good use of these hydrocarbons, country C has prepared two sets of new equipment on the ground.

One set is equipment for re-decomposition and synthesis of hydrocarbons, hydrogen and oxygen.

It sounds very high-tech, but under solar conditions in space, production capacity is not required, and a large number of lightweight materials are used, and a complete set of equipment is less than three tons.

The main function of this equipment is to separate hydrocarbons, hydrogen and oxygen into water, oxygen and alcohol. Excess carbon is made into graphite and packaged with tin foil.

Graphite is a high-risk item in space. Powdered graphite is pervasive in a gravity-free environment, which can easily cause short-circuit failures of the equipment. It is useless until the special graphite processing chamber is completed.

The other set is a new type of water circulation equipment.

In the past, space water recycling equipment was mainly for human excrement, with a comprehensive recycling rate of 95% to 97%.

The new equipment is mainly for slag, ore powder mixture, etc., to carry out water recycling cycle, which is more technically difficult and has more potential.

The new water circulation equipment has not been completely completed. What is about to be put on track this time is only its main structure, which can separate ore powder and **** for later use while recovering water resources.

As we all know, the essence of human industrialization is to boil water. This time, the new water circulation equipment also has a step to boil water, the purpose of which is to remove water-soluble substances.

Part of the electricity consumed for boiling water can be recovered from the steam, and the overall energy consumption is not large.

These two sets of equipment will be launched from electromagnetic well 5 (number 4 is skipped).

The fifth electromagnetic well, which has just been completed, will be tested for the first time after the future space station is docked with Developer One.

The rocket tested is called Yuanzheng No. 1B, with a diameter of 5 meters and a length of 30 meters. The visual obesity is similar to that of a solid rocket of 3.35 meters. Among them, 13.5 meters is the load section, and the entire upper stage is just over 17 meters. The first stage rocket that actually burns in the atmosphere is particularly short.

Different from the emergency situation of the 3.35-meter well, the No. 5 well fully takes into account the internal liquid phase change of the liquid rocket when it passes through the circular acceleration orbit, and finally there is a two-kilometer pure linear acceleration orbit, so the liquid rocket can be used directly.

As mentioned earlier, liquid rockets can adjust their thrust at any time or even ignite after flameout. The disadvantage is that the fuel tank will be much larger, but this is not a burden for super acceleration orbits of more than ten kilometers.

With the liquid solution, in addition to the advantages of the liquid rocket itself, there is another reason that no one in this world has made a solid rocket with a diameter of five meters. There are many technical difficulties in it. For example, the thicker the solid rocket is, the shape of the solid fuel when it burns. The changes will be more complicated, which is not conducive to precise control of thrust.

The test shot is mainly ice, about 20 tons, a cold storage for ice and an empty cargo hold. On the one hand, the solid water replenishes the space station, and part of it will be used for electrolysis to generate fuel directly on the space station, which is much safer than direct delivery of liquid hydrogen and oxygen fuel. The cold storage will be dedicated to freezing after the ice cubes are transferred, and it will contain a medicine refrigerating room whose set temperature can reach one hundred degrees below zero.

The length of Well No. 5 reaches 12.5 kilometers, which is a few hundred meters longer than the earliest plan. The first test fire only depends on whether the working conditions are normal, and does not have to challenge the limit.

The rocket and the acceleration shell are ejected out of the wellhead at a speed of Mach 2.5, separated from the acceleration shell, and used a three-stage radial (cylindrical side) propulsion to fine-tune the attitude at an altitude of one kilometer, and the main engine is ignited.

After several hundred seconds of burning, the first stage rocket pushed the upper stage to an orbit of 170 kilometers farther and 60 kilometers nearer to separate.

This is separated from the normal first-stage rocket, and even a full rocket stage is delayed, and it takes several months to fall back to the ground. In order to avoid threats to the surface during the fall, a small amount of fuel is reserved for adjusting the landing point.

What? Rocket recovery?

I have to admit that the rocket recovery technology developed by country A is indeed a good idea to save money.

But that was only before the emergence of electromagnetic orbital launchers.

What needs to be understood is that the rocket recovery of country A only involves first-stage rockets, and when their first-stage rockets were separated, the height was about 80 kilometers, and this location strictly did not leave the atmosphere!

The current No. 5 well can directly throw 400 tons of projectiles to the same height when necessary, without additional thrust in the middle~www.wuxiaspot.com~Of course, this is the case. The relative speed is gone, meaningless.

In short, the launch process was improved according to the alien’s suggestion. Based on the aerodynamic heating point, the speed was only maintained at less than Mach 3 at low altitude, and the thrust was increased to the maximum after the altitude increased.

Doing so will produce waste in the atmosphere, but it can leave more fuel to accelerate in the near-vacuum zone. The rocket has a characteristic. The closer the external environment is to the vacuum, the greater the characteristic specific impulse, that is, the same fuel can bring more.的ΔV.

When electromagnetic wells give supersonic base speeds, this late-force launch strategy saves more fuel than traditional models.

After the first stage rockets are separated, the upper stage will go up and chase, and the next stage will be based on the script. There is nothing new.

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