"Yes! I don''t know whether you need to buy special glass or bearings this time? Or both?" Wang Bin nodded and said.

    Then Donald ordered about 5000 energy coins of special glass and bearings from Wang Bin, and then he took out the technology he brought this time.

    Donald took out a stack of drawings, handed them to Wang Bin and said to Wang Bin, "this is the technology I want to use to offset the purchase of these products this time!"

    Wang Bin took the drawing in Donald''s hand and looked at it for a while. He found that the technology in the drawing was somewhat unexpected.

    Originally, he thought that Donald''s deduction for the first time would not be too advanced, and it could not be their world-class technology.

    However, in fact, the technology Donald gave him is not simple. Even if it can''t be compared with Wang Bin''s world-class technology, there may be a little gap, but it also has very high value. Even most countries in the world can''t make the things in the drawings at all.

    All Wang Bin can be sure that the technology in the drawing is definitely the top technology in Donald''s world, or strategic technology.

    Donald''s technology is an aeroengine technology and a turbojet aeroengine technology.

    Most importantly, according to the data on this drawing, the specific impulse produced by this engine actually reached about 11, which surprised Wang Bin most.

    Even in Wang Bin''s world, there are not many countries that can produce jet turbojet engines.

    However, there are not very few, at least a dozen, but few countries can produce high-performance engines.

    In particular, there are few countries that can produce engines with a specific impulse of more than ten, even the fourth generation engine of the bald eagle.

    Although the thrust of a single F-22 engine reaches about 18 or even 19 tons, its engine specific impulse is only about 10.

    However, Donald''s world, his country, has the ability to produce aeroengines with specific impulse up to 11. How can it not surprise him!

    According to the normal development of science and technology in Wang Bin''s world, although their country had developed and produced jet aircraft engines in the late World War II.

    However, the technology is still in a very primitive stage, and it is impossible to achieve this level.

    Donald saw Wang Bin''s expression and knew what Wang Bin was thinking. At this time, Donald said, "President Wang! In fact, this drawing is not completely designed by our country.

    As you must know, President Wang, the level of science and technology in my world, even if I have gathered most of the excellent aero-engine experts in my country, the jet engine designed by me still has many defects, and the highest specific impulse is only 7-8.

    Therefore, after the experts in our world designed this engine, I found a professional engine design shop in the mall and made substantial design modifications to it before completing the design of this engine.

    However, even so, with the technological level of our world, the performance of the engine can only reach about 80% of the design data, that is, about 9 impulse ratio.

    This is the reason why we have used a lot of bearings and other accessories provided by President Wang. If we don''t use these materials and accessories provided by President Wang, it will be very difficult to reach nine. "

    Wang Bin nodded and asked the system secretly at the same time; "System, how about Donald''s technical drawings, their performance, technical integrity and how many energy coins can be deducted?"

    Although Wang Bin has a certain understanding of aeroengines, in fact, it is only limited to ordinary people. Even compared with those military enthusiasts, he is not as good as them. Therefore, of course, he can''t know the technical performance of this engine accurately. The best way is to ask the system.

    "Host! According to the data of this drawing, the maximum length of the engine in the drawing is 4.9M, the maximum diameter is 1.1m, the maximum diameter of the nozzle is 0.61m, the self weight is 1.0T, and the maximum thrust is 120kn.

    The technical performance is very good for the host world, and has reached the international advanced level of the host world.

    At the same time, the technical integrity of the engine in this drawing is 100% except for the material technology of the engine. According to the system identification, the deduction price of this engine drawing shall not be less than 10000 energy coins. The system recommends that it be purchased at the lowest energy currency price of 10000. "Just after Wang Bin asked, the system gave the price for purchasing this engine.

    For the price given by the system, Wang Bin is still a little surprised. In the system, the price of an engine with similar performance to this engine is as high as about 100000.

    However, the price of purchasing the technology of this engine from Donald is only 10000 energy coins, which makes him feel that it is really expensive to buy technology from the system.

    But then he understood why the technology sold by the system was so expensive.

    This is because the technology sold to him by the system will directly instill the technology into his mind. There is no situation that he can''t understand.

    It even includes some other related technologies, such as how to build the production line.

    Therefore, in fact, the price of these technologies purchased in the system itself is not high, even lower than what he bought from Donald.

    However, the price of these knowledge instilled into the mind of the system is not comparable to these technologies themselves, so the price purchased from the system will be higher.

    Wang Bin, who regained his mind, said to Donald, "Mr. Donald, your engine technology may be the top aviation technology in your world.

    Compared with the world where I live, your engine technology can''t be compared with those engines with real high performance.

    However, as our Tiangong technology, the most primary air launch in my real world in the future is also enough, so I also accept this technology. As for the deduction price, it is calculated according to the price of system identification, 10000 energy coins! "Wang Bin said.

    Donald nodded and said, "yes, Mr. Wang! It''s based on this price."

    Donald was not surprised by the price given by Wang Bin. In fact, when he brought the technical drawings and data of this engine to the mall, he had the system identify it, so he knew the price long ago.

    Then Wang Bin and Donald talked again, and they returned to their own world.

    As for the extra part of energy coins, Wang Bin did not directly give it to Donald, but directly buckle it in his own hands. He will settle it after he purchases their Tiangong technology products next time.