Chapter 744

2020！ A new start! Happy New Year! Good luck! Happy every day!!!

"How does this look like the design in those science fiction movies?" Make complaints about the combination of the solar sail and Lei Tian Tang could not help laughing and Tucao Dao.

"Ha ha! Don't say, boss, this design is really borrowed from science fiction movies! If according to our design, after the installation of solar sail, the flight speed of the combination will be about doubled, which will save more time for our deep space exploration program!

After all, the diameter of the solar sail we plan to reach is about 300 meters! " Zhang hanxiu pointed to the design drawing and said.

As we all know, light is composed of photons with no static mass but momentum. When photons hit a smooth plane, they can change the direction of motion like a ping-pong ball rebounding from the wall and exert corresponding force on the impact object.

At the distance from the earth to the sun, the thrust of light on a square meter sail is only 0.9 dyne, less than the weight of an ant.

Therefore, in order to get the maximum acceleration from the sunlight, the solar sail must be built very large and light, and the surface must be very smooth.

If the diameter of the solar sail increases to 300 meters, its area will be 70686 square meters, and the thrust obtained by light pressure will be 0.034 tons.

It may seem like a small thrust, but because of the inexhaustible energy provided by the sun's light, spacecraft with large solar sails could eventually travel at 240000 kilometers per hour. This is four to six times faster than the fastest rocket propelled spacecraft today. It is six times faster than the second universe and four times faster than the third.

It's not hard to understand that. Because the spacecraft running in space is in a state of weightlessness and no air resistance, as long as a small amount of force is added, the direction and speed of motion will be changed.

This is similar to the ion engine used on the combination. It seems that the thrust is very small, but as long as the acceleration time is long enough, the flight speed will be faster and faster!

"It seems very troublesome to design the direction control and other operations in the flight of the combination like this? And how to solve the problem of the weight of the solar sail? "

After seeing the original projection of the combination with a solar sail, Lei Tiantang always thought that the design was a little strange, because compared with the huge and incomparable solar sail, the volume of the combination itself was very slim, so it was very difficult to control the combination of them.

And even if the solar sail itself is made thinner, it also has weight. If the thrust generated by it is offset by its own weight, then the design is not worth the loss, because it is not a simple thing for such a large body to control it in high-speed flight.

"In terms of control, we have done a lot of design to ensure the precise control of the solar sail after it is fully deployed. Anyway, this design is also used to launch the combination far away from the sun. For example, the mercury and Venus probes we are still designing do not have this design.

Generally speaking, when flying in the direction of sunlight, the angle adjustment of the solar sail is relatively easy to solve, which we have verified in the simulation system.

As for the weight of the solar sail, because of the latest graphene composite material from the materials company, the 300 meter diameter solar sail can be combined with its eight supports, and the weight is only 25kg. Compared with the acceleration it brings to the assembly, its weight is completely negligible. " Zhang hanxiu enlarged the projection details of the solar sail and explained.

"But how can you ensure that the combination can fly safely with so many detectors? If there is an accident during the flight, the loss will be great! "

Lei Tiantang is still not optimistic about this design. A combination carries so many detectors. After looking at the simulation picture on the combination, a total of 40 detectors of different types are carried, and the smallest of these detectors is 15 tons.

Even if they are launched into the earth transfer orbit only by rocket and launched by the company's "julingshen 2" heavy-duty recoverable rocket with the largest load, it can launch up to two detectors at a time.

With the combination bracket, four ion engines, solar sails, two rocket boosters, and its fuel filling, all of which add up to about 30 launches!

Even if the launch cost of the company has been reduced to about 5 million US dollars per time, the launch cost will reach about 200 million US dollars. After all, even if the rocket is recyclable, there are losses, and these costs should be added in.

Even if the cost of manufacturing these detectors and ion engines is more than 500 million US dollars, it is still because most of the products are made by the company itself, so much can be achieved in terms of the manufacturing cost!

It seems that $700 million is not much for the infinite gravitation group, but if the time cost is added, the loss will be unpredictable. After all, it will take at least half a year for 30 launches and combination of them. After all, it does not mean that these things are launched into the earth transfer orbit, and any one of them will be finished.The relevant testing work needs to be confirmed again and again. It's ok if you can find the problem at home. If you find the problem after the release starts, it will be troublesome.

After all, there are many possible problems in the flight. If there is one problem, all the probes will fail.

No matter how much money the company has, it can't accept the failure of so many detectors. The waste of manufacturing cost and launch cost has nothing to do with it. However, if it takes at least half a year to make the company's space program go wrong, Lei Tiantang can't accept it, so he asked this question on purpose.

"Of course, we also have a comprehensive consideration of this problem. The problems you are worried about may happen, boss. Even if we do more tests and tests, we can not fully predict the dangerous situations that may occur during the flight of the combination.

However, boss, you have forgotten that our detectors are also capable of flying. If there is an accident during the flight of the combination, these detectors can be directly separated from the combination according to the predetermined procedure, and then they can use their own ion engines to adjust their orbits and continue to fly! "

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