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"Professor Lu has brought the latest recyclable rocket design scheme, you all come and have a look!" Senior Colonel Liu stepped back a little and gave them the computer screen, "According to my preliminary judgment just now, this scheme is theoretically very feasible! You can also analyze and analyze it!"

"That's something that can be analyzed in a moment!" someone muttered, but he bent down and stared at the monitor tightly.

The space in front of the computer is so big, and the display screen is too small, and the few people in the back stretched their necks and didn't see anything, so they couldn't help but protest, "I said Chief Engineer Liu, don't you have a projector here?"

"Oh, yes, yes, yes, I forgot about this when I was excited!" Colonel Liu patted his head, smiled embarrassedly, and quickly took out the projector to connect it, and the others also hurriedly stepped forward to help, and after a while, a clear big picture appeared on the projection screen on the office wall.

Well, the **** big picture looks cool! Everyone found a place to sit and looked carefully, Colonel Liu returned to his computer, took out a laser pointer and began to act as a commentator, "Professor Lu's design idea is to equip the first-stage rocket with 9 engines, and when the first-stage rocket returns after separation, you can only ignite 3 of the engines, and when you want to slow down before landing, you may only need 1 engine, and the combination of multiple engines can realize the recovery and use of the first-stage rocket!" At the same time, there are 4 deployable flanks on the rocket body, which are used to assist the control of the rocket to land towards the predetermined location through satellite guidance, so that the accuracy of its final landing is within 8 meters, which is much stronger than the parachute landing plan we have formulated before."

"Can this method ensure the stability of the rocket after the separation of the first and second stages?" someone listened and raised their own questions, and one of the biggest difficulties in recovering the rocket was here. The first stage of the rocket must remain vertical when it re-enters the atmosphere, and if it rolls sideways into the atmosphere, the rocket will be subjected to too much resistance by itself. Violent friction with the atmosphere is very likely to cause an explosion.

Keep the elongated rocket body perpendicular to the ground at all times. The difficulty of this can be imagined, and the aerospace industry uses this phrase to describe this difficulty - "make the broom handle stand upright on the palm of the hand in a strong wind", and if you want to meet this standard, unless this broom is Harry Potter's "fire bolt"!

"For this problem, Professor Lu has given a solution below!" Colonel Liu changed to the next picture and said with a laser pointer to draw circles on several parts of the picture, "During the return process, the first stage of the rocket adjusts its attitude through the liquid nitrogen thruster on the guò arrow to cope with the effects of aerodynamic torque and rotation. It leaves it with almost no roll, and remains in an ideal state perpendicular to the ground during the landing, and the formula for calculating the aerodynamic torque and rotation is also given, which, according to my rough calculations, is quite capable of achieving the goal. ”

"Let me do the math! If the weight of the first-stage rocket is 42.6 meters in length and the diameter is the speed at which it returns to the atmosphere," someone immediately started his own calculation according to the formula proposed by Lu Qiujian, closed his eyes and did some mental calculations in his mind, and then he opened his eyes suddenly, "I substituted the number jù of a certain type of rocket for calculation, and the result was completely in line with Professor Lu's plan! It seems that this thing is really useful!"

"Is three engines enough to slow down a rocket?" asked a second question.

"The first restart is designed to reduce the landing speed of the first-stage rocket so that it can land at the intended recovery site, when the first-stage rocket comes to the air above the intended location. Then restart its other engine to slow down even further. Eventually, the speed of the rocket should be reduced from the initial 1300 m/s to 2 m/s. In addition, before the first stage of the rocket approaches the landing site. The four landing brackets installed at the bottom of the rocket should be opened, and it is equipped with hydraulic shock absorbers, which can further reduce the huge impact during vertical landing, thereby weakening the impact of the landing momentum on the rocket body and achieving a soft landing!"

Next to the picture, there is a detailed calculation formula, and the person who asked the question calculated it based on his own experience, and the result is the same as just now, and this design can completely allow the rocket to achieve a successful soft landing.

After reading all the design drawings, the confidence of all the aerospace experts present in this plan has reached its peak. I can't wait to start making real rockets right away.

"If Professor Lu's program test is successful, then the cost of our rocket launch will be greatly reduced!" Senior Colonel Liu said excitedly, adding that the cost of space launch is very high. This cost mainly includes the development cost of the launch vehicle, the launch cost of the launch vehicle, the measurement and control cost of the launch vehicle, and so on.

The Saturn V rocket used by the United States for the moon landing cost $185 million for a single launch, and the Long March 3BE of China. The price is about 400 million yuan, and it will cost humans about 10,000 to 20,000 US dollars to send one kilogram of material into space.

Take the Long March 3be as an example, the largest weight of the rocket is the fuel weighing 400 tons, including metamethylhydrazine, about 250,000 tons, liquid hydrogen about 100,000, other liquid oxygen and nitrogen tetroxide are about 10,000, and the total price of the entire rocket fuel is about 60 million yuan.

The remaining costs of the launch site, measurement and control, and transportation are actually not very high, and the remaining more than 300 million yuan is spent on the rocket body, engine, etc., of which the cost of the first-stage rocket is the highest.

If the first-stage rocket can be recycled, then the next launch only needs to continue to fill the fuel, and then the second and third stage rocket bodies can be used! In this way, at least 70 percent of the launch cost can be saved, and the launch price of the Long March 3be will immediately drop to 120 million! This is still counting the cost of increasing the engine and fuel!

Of course, doing business will certainly not do this, and Senior Colonel Liu will never sell a rocket launch at a time at the price of a cabbage! However, even if it drops to 250 million yuan, the global low-end satellite launch market will be completely monopolized by them! The profits in this can be imagined.

For example, in the past, launching a rocket was like using a match, and lighting the match once was useless! Now it is like using a lighter, and the oil in the lighter is gone! Even if the price of the lighter is a little more expensive than the match, they will gladly accept it!

[It's about to be 515, I hope to continue to hit the 515 red envelope list, and the red envelope rain will be able to give back to readers and promotional works on May 15. A piece is also love, and it must be better!] (To be continued.) )