It is precisely because the 929 is still under development at this time, in fact, the test flight object of Wang Bin''s engine is only those large transport aircraft of the military.


    But in fact, there are not many models for the military to choose from at this time. In addition to the No. 20 transport plane just developed by Huaxia, it is also a 76 large military and civil transport plane from the Arctic country. As for the transformation of imported civil aviation large passenger aircraft, Wang Bin still has no plan at this time.


    In other words, in fact, there are only two test flight objects for Wang Bin to choose.


    Thinking of this, Wang Bin no longer thinks much. After all, this is not his choice, but depends on the military''s desire to use that aircraft as the test flight object. However, Wang Bin still has a certain hunch that the military is likely to use the No. 20 transport aircraft produced by Huaxia as the test flight object.


    But then Wang Bin thought it impossible. After all, the number of transport aircraft No. 20 produced now is still very priority, so it is impossible to install S003 turbofan engine for verification and flight test. Therefore, the final possible flight test object is aircraft No. 76 from the Arctic country.


    However, a few days later, when Wang Bin was in a hurry, the test plane Wang Bin expected finally came, and this time the plane ready to install Tiangong technology''s S003 turbofan engine was not the No. 76 transport plane Wang Bin thought before, but the No. 20 transport plane produced nationwide.


    This surprised Wang Bin. After all, even the Chinese military doesn''t have a lot of this aircraft. Even if it''s not enough for their own use, it will be divided into one for the test flight of their Tiangong technology S003 turbofan engine.


    "Qiu Tuan! I can''t imagine that you are really willing to use plane 20 for test flight. Are you worried about accidents?" Wang Bin said to Qiu Tuan very unexpectedly when Qiu Tuan, the crew and several technicians got off the plane when the plane stopped at the airport runway today.


    "Mr. Wang! Originally, we were going to use aircraft 76 for verification and test flight, but considering that aircraft 76 is not a domestic aircraft and its design life has been a little long, the most important thing is that we have not fully understood many core data of the aircraft, so the risk of using transport aircraft 76 for verification and test flight is still very high.


    However, this No. 20 transport aircraft is different. Because this aircraft is completely designed and manufactured by ourselves, we know all the data performance of this aircraft clearly. Therefore, compared with using No. 76 transport aircraft for verification and test flight, the risk of using No. 20 aircraft is much smaller.


    Most importantly, although our No. 20 aircraft has entered the mass production stage, and the domestic large bypass ratio turbofan engine specially built for this aircraft has also entered the small-scale mass production stage,


    However, its production capacity is still very limited, which greatly restricts the production speed of this aircraft. Even if some turbofan engines with high thrust and large bypass ratio are imported from abroad, it is still far from enough.


    In addition, whether we have entered the small-scale mass-produced turbofan engine or the engine imported from the Arctic country, there are some problems. After all, people will not sell their most advanced engine to Wang Bin. At the same time, the price is outrageous.


    Therefore, we simply take this aircraft as the test object of this flight test verification. As long as the engine of Tiangong technology can be successfully tested and the data meet your expected requirements, it will greatly reduce the pressure on the engine of our aircraft.


    At that time, the production capacity of this aircraft will be greatly improved. It is in view of these that we will use this aircraft for test flight.


    At the same time, in order to ensure the state of the aircraft during installation and flight test, we specially invite the manufacturer of this aircraft to send a number of technicians to cooperate with you to install the engine, "Qiu Tuan said.


    With the arrival of the No. 20 transport plane, Wang Bin naturally began to dismantle the original engine and install a new engine for the plane. At the same time, because the aircraft was originally installed with a high thrust and high bypass ratio turbofan engine, and the strength of the engine hanger and wing are also sufficient, Therefore, this aircraft does not need to be improved like the tg-s002 installed on the No. 9 aircraft before.


    Moreover, since this aircraft is the latest transport aircraft independently developed by Huaxia, even if Wang Bin''s Tiangong technology wants to have any ideas about this aircraft, the military will never allow it.


    It was at least a simple replacement of the engine. It took only three days. Wang Bin and his team completed the replacement of the four engines of the aircraft.


    After installing these engines, the technicians brought by Wang Bin and Qiu regiment conducted a comprehensive inspection of the aircraft and confirmed that there were no problems, so they began to test fly the aircraft.


    As the test flight of the aircraft began, the engine of the aircraft was naturally noticed soon. After all, there are many people who pay attention to the aircraft. Although the aircraft has been out for several years, there are still many people who pay attention to the aircraft.


    So, in a moment, the No. 20 aircraft that was being tested appeared on the whole network.


    At the same time, many online news media, even the official news, have reported this matter one after another.


    "God! What did I find? Transport plane 20 has changed its engine, and the diameter of this turbofan engine seems to be much larger than that before. At the same time, when flying, the sound of this engine seems to be smaller, so I don''t know how the performance of this engine is."


    "Yes! But I still know some about the manufacturer of this engine. After all, the words and trademark of Tiangong technology are obviously on the hood of this engine, so it is obvious that this engine must be a product of Tiangong technology."


    "No! This engine is really a product of Tiangong technology. I just went to the official website of Tiangong technology and found that it is really an engine developed by Tiangong technology, and some basic data of this engine."


    "Yes! I also saw that according to the data of Tiangong technology, the model of this engine is tg-s003 turbofan engine, and the service life of this engine is very long. The first repair time can reach at least 15000 hours, and the whole service life of the engine can reach at least 45000 hours.


    At the same time, the thrust of this engine is also very large, reaching an amazing more than 30 tons. Although the specific data of this engine are not published on the official website, according to the published data of more than 30 tons, it can be inferred that the thrust of this engine is at least 31 to 32 tons.


    If these are true, as Tiangong technology itself said, the performance of this engine has absolutely reached the level of the world''s top engine. "