Therefore, the interface of the cable can be changed according to the radius of the track, so that the cable reaches a structure that scales from the synchronous rail station to the ground.

The purpose of the cable is to straighten the cable and prevent it from hitting the ground, so this step of the project must be carried out after the construction of the synchronous rail station and counterweights has been completed.

Ye Fan's plan was to split the cable into many sections, and then hang down on the synchronous orbital station and connect them in turn.

Therefore, in order to achieve fixed and continuous elongation, the specific construction plan can refer to the self-elevating tower top mechanism of the tower crane.

However, it seems simple, but in fact there is a problem, that is, when the lower angle is called during the construction period, the cable will have different angular velocities, which will deviate from the axis, and even destroy the entire structure.

Therefore, it is necessary to set up a long-term resident near space vehicle to act as an observation station, and at the same time limit and correct the cable, and Ye Fan's space-based weapon can be modified to complete this task.

After the ground station and the cable, there is the question of the synchronous orbital station.

The construction difficulty of the geosynchronous orbital station is the lowest among all parts, because the geosynchronous orbital station is located in geostationary orbit (GEO), which is convenient for fixed position, and the part located in space should be built from the synchronous orbital station.

Its function is similar to that of the ground station, which has to carry out the function of a port, except that one is a ground port and the other is an airport.

At the same time, it also stores the car, releases the car, installs dampers and, most importantly, carries out space activities, such as space research, the launch of probes, etc.

The scale of this construction is very large, but because it is in a proper synchronous orbit and in a state of equilibrium, the impact on the overall part is not very large.

If the third batch of mining spacecraft does not return, even with the current technology of mankind, all the technology of the rocket engine to press the bottom of the box is taken out, and the construction of this project is far away.

Taking into account the various payloads of the synchronous orbital station, it is estimated that its mass should reach at least 20 to 30 times that of the ISS, that is, 8,000-12,000 tons, and with the current launch capacity, it will take at least 200 launches before the synchronous orbital station can be built.

If today's fossil fuel rockets are based on the launch records of (including private companies), the Huaxia Space Agency, the European Space Agency and the Ross Federal Space Agency (19 times, including no more than 10 heavy rockets), it will take at least ten years to complete.

Therefore, if Ye Fan did not get the system and did not promote scientific and technological progress, even if mankind developed a rocket with a 100-ton GEO carrying capacity in the next 20 years, under a more intensive launch plan, the construction period of the synchronous orbital station would take less than five years.

Such a long time is something that humans cannot afford to wait for at the moment.

In the whole space elevator project, the more difficult point is the problem of counterweights, and the difficulty of its construction lies in how to connect with the synchronous orbital station, and how to keep synchronized with the synchronous orbital station after the connection.

The counterweight is located at the apogee end of the axis of the synchronous orbital station, and its distance from the synchronous orbital station is determined by the mass of the synchronous orbital station to the Amin cable, its own mass and the tension that the ground can provide.

The counterweight can be equipped with some functional modules that are required by synchronous orbital stations, but are not easy to build, such as large-area solar panels.

After all, it is currently impossible to move a nuclear fusion reactor to it, so except for the particularly large spacecraft, the rest of the spacecraft rely on their own super batteries to provide electricity, or install solar panels to collect stellar energy to improve the endurance of the spacecraft.

As for the counterweight, it can also be used as a synchronous orbital station, but this synchronous orbital station is relatively far away.

The environment in space is extremely complex, and the construction and maintenance of two synchronous orbital stations is also very difficult, so it is better to do a good job of the space elevator, and then after building a number of space mining spacecraft, carry out space heavy industry plants at the far end of the earth to produce related rare metals and materials.

The last difficulty in the space elevator project lies in the car.

Don't look at this thing, like the cabin of an elevator, it looks untechnical, but in fact, the difficulty of building this thing is no less than that of a counterweight.

The biggest problem with the car is how to rise and how to increase the tangential speed during the ascent.

And it is necessary to ensure that its ascent speed is not too fast, otherwise the occupants in the car will die due to atmospheric friction or because of too much G overload.

At the same time, when descending, it is necessary to maintain a certain speed, not only to ensure the speed of time, but also to maintain a reasonable speed, otherwise the car is no different from a meteorite that smashes directly into the ground.

For now, the origin has two solutions, which is to install the relevant equipment to increase thrust under its car, like a rocket, and thus propel the car up.

The anti-gravity engine is the first to be ruled out, after all, the volume of the anti-gravity engine is very large, and at present, with the strength of Datang Technology, it is not possible to miniaturize it, and the most important problem is that its rise is too slow.

In addition to these two shortcomings, its balance is stable, and it can be as stable as Mount Tai at an altitude of 10,000 meters, which is not comparable to other engines, but it is bulky and slow, which is enough to exclude the anti-gravity engine.

After all, today's anti-gravity engines are still in their first generation, and even if a synchronous orbital station could exert the relevant pull force on it to accelerate its ascent above the atmosphere, it would take at least eight hours.

For such a long time, it is a bit difficult to give it away, and it can only be used to deliver goods or something.

The fossil fuel engine is not realistic, after all, the space elevator can be reused, if you engage in a fossil fuel engine, carrying a large fuel tank, although the size is much smaller, but there is no practical application value.

So for now, the focus is on the ion engine, and when the third batch of mining spacecraft comes back, the thrust provided by the third generation ion engine is enough to push the relevant equipment out of the atmosphere, and it can also maintain the right speed.

However, there is a problem with this method, that is, since the angular velocity does not change, the linear velocity will increase as the radius increases during the rise.