After listening to Xiang Shixiong''s words, Wang Bin thought about the performance of his glass.

    Indeed, as Xiang Shixiong said, if the fuselage of this UAV really uses this glass, as long as the engine is strong, it is not impossible to reach the speed of Mach 4, but the temperature of the aircraft fuselage at this time will also rise to the limit that this glass can bear.

    And such a speed can only be achieved at an altitude of more than 10000 meters. If the altitude of UAV is less than 10000 meters, the temperature generated by the friction between glass and air will exceed the temperature limit that their glass can withstand.

    Of course, if the speed is below Mach 4, the high temperature resistance and other properties of this glass can still be tolerated.

    So Wang Bin said: "indeed, if we use this glass as the fuselage, the speed of Mach 4 at high altitude is not a problem. Even at low altitude, the speed of Mach 3 can still be borne."

    "The specific data have been calculated by our scientific researchers of XAC, which is absolutely no problem. The biggest problem now is whether Tiangong technology is able to use this glass to make the fuselage of this UAV.

    After all, the fuselage of this UAV is not made up of flat glass. Take the wing of this UAV for example. The wing is an integrated wing, which must be completed at one time in the production process without any deformation. Otherwise, the UAV is very easy to get out of control in the flight process, especially in the high-speed flight process.

    In addition, there is the segmented part of the fuselage, which is also very difficult in technology. The segmentation of the UAV fuselage requires that there are no pricks or bulges on the surface. This is a little burr of the aircraft with a speed of Mach 4, which may lead to problems of the aircraft.

    Finally, there should be no errors in the nose and tail,... "

    With the introduction of Xiang Shixiong and the two engineers, Wang Bin has a basic understanding of the technical difficulties in manufacturing the UAV fuselage and wing. At the same time, he is also thinking about how to solve these technical difficulties.

    After Xiang Shixiong introduced all the technical difficulties of the UAV fuselage, Wang Bin fell into thinking. The manufacturing of this UAV fuselage is a great challenge for Wang Bin.

    The first is the thickness of the fuselage glass. According to their previous introduction, Wang Bin believes that the thickness of the fuselage glass of this UAV cannot be too low, at least not less than one millimeter.

    Otherwise, the heat generated by the aircraft when flying at high speed will definitely make the internal parts of the UAV unbearable. After all, the thinner the original thickness is, the worse the thermal insulation performance is. Therefore, to ensure the safety of internal parts, the glass should be at least one millimeter thick, preferably two millimeters thick, but in this case, Compared with the glass one millimeter thick or even thinner, the weight will definitely more than double, which will also have a significant impact on the overall performance of the whole UAV.

    However, Wang Bin suddenly thought that in fact, a millimeter thick is enough, and there is no need to increase the thickness of the glass, because in terms of heat insulation, in addition to the glass of the fuselage itself, Xifei will certainly use other technologies to increase the heat insulation performance, such as coating the heat insulation layer on the fuselage.

    After a long time, Wang Bin said to them: "President Xiang! Regarding the fuselage of this UAV, we Tiangong technology can use glass to try. Please don''t have too much hope. Although the glass of Tiangong technology is advanced, we really haven''t thought about whether it is feasible to use this glass to make the fuselage of the aircraft. Most importantly, although this UAV is small, the fuselage is very small The structure of many places is somewhat complex! "

    "Well, I know. In fact, we have a try attitude towards this. After all, using pure glass to make the fuselage is the first attempt! As long as you try your best," Xiang Shixiong said.

    Then Xiang Shixiong finally opened his briefcase, took out a document data and said to Wang Bin, "President Wang, these documents are the glass data we ordered this time. Please keep them. At the same time, pay attention to confidentiality. I won''t say more about specific information. We hope to wait for the good news of Tiangong technology."

    Then Wang Bin and Xiang Shixiong talked for a while. Just when Xiang Shixiong wanted to get up and leave, Wang Bin said to Xiang Shixiong, "President Xiang, I don''t know if your company needs bearings for aircraft and engines?"

    "What? Engine bearings? Has your company developed anything good these days? Has Professor Hu made a breakthrough in his research? I remember Professor Hu was engaged in this research when he was on the job. Even after he retired, our company wanted to hire him. Finally, you Tiangong technology picked him up."

    Speaking of this, Xiang Shixiong continued with great interest: "Mr. Wang, can you talk about the specific performance of this bearing? If the performance meets the requirements of Xichang, we don''t mind using your Tiangong technology bearing."

    Wang Bin did not refute Xiang Shixiong''s view that this glass was developed by Professor Hu. He said: "The performance of this bearing is very excellent. Its maximum high temperature resistance reaches 2300 degrees. Before the temperature reaches the limit, the performance of the bearing will not change much. At the same time, the minimum life of this bearing has reached more than 5000 hours according to our expectation.

    Of course, this is only our expectation. After all, it has only been a week or two since our bearing was developed. Even if it is tested 24 hours a day, it is only a few hundred hours. Therefore, the available data are still under test, but according to Professor Hu''s calculation, the service life of this bearing will never be less than 5000 hours. "

    With that, Wang Bin took out the bearing he had asked Jiang Zongliang to fetch from Professor Hu from the drawer of his desk, handed it to Xiang Shixiong, and then said again: "Mr. Xiang! This is the aviation bearing we manufacture. However, because manufacturing this bearing requires a variety of strategic scarce materials and ultra-high-precision CNC machine tools, we have not made it on a large scale. Until now, we have only made a few for testing.

    Mr. Xiang, the bearing in your hand is actually just a test object, and it is also a bearing that has been tested for a week. There are still some deficiencies in accuracy. The bearing is only made by a machine tool with three-level accuracy. "