Of course, in addition to the large-thrust rocket engine technology of one or two thousand tons, if Wang Bin and Tiangong Technology want to develop aerospace technology, they also need small-thrust rocket engine technology of one or two hundred tons, and even small-thrust engine technology with a thrust of only a few or a few dozen bulls.

In addition, there are also the steering propulsion device and calibrated wheel of spacecraft.

These technologies require energy coins to be purchased. Thinking of this, Wang Bin began to worry about the energy coins in his hands again, because based on these technologies needed to be purchased, it is really not enough to buy them with the energy coins in his hands alone.

After all, only one thousand tons of large-thrust rocket engine technology, plus other rocket technologies, such as rocket body technology, fuel tank technology, etc., will require nearly two million energy coins, while one or two hundred tons of small-thrust rocket engine technology will cost at least hundreds of thousands of energy coins.

If you add a few Niu and dozens of Niu and various steering thruster levels, the energy coins you need will definitely exceed the energy coins you have at your fingertips.

In addition, if you want to create and launch rockets, these rocket engine technologies alone are far from enough. Multi-stage rocket technology, bundled rocket technology, etc. According to Wang Bin's estimate, there is no energy coins without two million.

He could not buy the entire set of large-thrust rocket technology. If rocket recovery technology is added, Wang Bin will need at least eight million energy coins.

This made Wang Bin a little stunned for a moment. After all, in his original plan, Wang Bin thought that only the price of three to four million energy coins could be purchased, the entire set of fourth-generation rocket technology could be purchased. However, after calculation, the price of four million could only be purchased, which made him a little at a loss.

However, Wang Bin immediately thought that he didn't have to buy a complete set of fourth-generation rocket technology. In fact, many technologies, with the current strength of Tiangong Technology, as long as they have corresponding talents, it is not difficult to develop technology that is not much different.

Moreover, even if Wang Bin and his team were unable to develop corresponding technologies for a while, they could ask the official for help. Xianhua Aerospace has definitely related technologies.

Thinking of this, Wang Bin's originally frowning also let go, so he now used the price of one million energy coins to purchase the fourth-generation rocket engine technology of 1,000 tons, and then spent the price of fifty-five energy coins to purchase the fourth-generation engine technology of 100 tons and 200 tons.

As for the micro rocket thruster technology with smaller thrust, Wang Bin did not buy it because he knew that thruster technology like this could definitely be developed with their Tiangong Technology's capabilities. Even if they cannot develop it, he could turn to the official aerospace agencies.

In terms of various space steering thrusters, Wang Bin did not buy them in the system. As before, like this, he believes that for Tiangong Technology, it is definitely not a problem, and he doesn't have to worry at all. What's more, as long as he has high-thrust rocket engine technology, the official will definitely be very happy to help.

Finally, there is the Rocket's control system, the Rocket's fuel tank and recycling system. Wang Bin thought about the Rocket's fuel tank technology and spent 300,000 energy coins to purchase five diameters, namely 1 meter, 1.5 meter, 2.5 meter, 3.5 meter diameter, fifteen fuel tank modules and separators and other technologies. As for technologies such as larger diameter fuel tanks and separators, Wang Bin did not purchase them.

Because he knew that even if he had purchased a larger diameter rocket fuel tank module technology, it would not be used for the time being. The most important thing is that among the engine technologies he purchased, the largest diameter engine, namely the 1,000-ton rocket engine technology, has a diameter of only 2.5 meters, so Wang Bin does not need a larger diameter fuel tank technology for the time being.

Of course, with these fuel tank technologies, Wang Bin believes that it will be difficult if they want to develop larger diameter rocket fuel tank technology.

In fact, Wang Bin knew that the rocket's fuel tank technology was not difficult, and the reason why Wang Bin bought these technologies was so high is entirely because these technologies also included the production equipment technology of these technologies, so it was so high.

When Wang Bin bought all these techniques, the more than 1.5 million energy coins he had just obtained had been completely drawn, and he even consumed almost the nearly 55 energy coins left in his hand.

Of course, Wang Bin felt a little heartbroken about spending so many energy coins at one time, but thinking that their Tiangong Technology is now different from the past, and the speed of making money energy coins is no longer comparable to when he just obtained the technology mall system.

You should know that before, if he wanted to accumulate 500,000 energy coins, it would take nearly a month to accumulate it. Now! As long as he sells a Tiangong 001 drone, it is enough for him to buy a lot of technology.

The most important thing is that from the situation where he sells drones this time, as long as the price of drones he sells in the technology mall in the future is not too high, the buyers will think there will be no less.

Thinking of this, Wang Bin felt much better.

After buying the technology, Wang Bin immediately withdrew from the system, returned to reality, and prepared to rest. As for the technologies he just purchased, in addition to the technologies in his mind, physical objects such as design drawings, technical parameters, processing technology, materials and formulas were temporarily placed in the store by him. After all, compared to reality, the safety in the mall is higher. He doesn't want to spend such a big price to buy the technology, which is cheaper to others.

...........

Early the next morning, after breakfast, Wang Bin immediately arrived at the company and, with Professor Ku and others, checked the Tiangong 001 drone that flew past yesterday, and assembled the drone again.

When Wang Bin and his team assembled the drone again and moved it to the runway, General Lin and General Qiu also came to their Tiangong Technology.

"Mr. Wang! I have two good news to tell you that the engine production certificate submitted by your Tiangong Technology has been recognized by our military and has submitted our opinions to relevant departments. If there is no accident, your production license should be approved in the next few days!" When General Qiu came to the runway, he immediately told Wang Bin about the engine production license passed by the meeting yesterday.
Chapter completed!