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Chapter 477 Earn some pocket money

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    But this time, the central wing box Lin Guanghua took out was not the traditional small wing box embedded inside the fuselage, but a top-mounted central wing box placed outside the fuselage.

    The advantage of this is that it can ensure the integrity of the cabin to the greatest extent, increase the volume of the cabin, ensure the loading capacity of cargo, and give more flexibility to transportation tasks.

    At the same time, the large roof-mounted central wing box is also the largest fuel tank in the entire aircraft. Because it is roof-mounted, there is no need to consider the structural bearing issues of the entire cabin section as in the past. Therefore, compared with the traditional embedded central wing box,  The box can be made larger.

    Although this gives the aircraft the appearance of a hunchback, the benefits of this hunchback are also obvious. It not only allows the wings to withstand greater external forces, but also improves the performance of the wings.  The airfoil selection is more flexible and the carrying capacity is greater. In other words, the fuel capacity of the wing fuel tank can be increased.

    After such a series of optimizations, even if the advanced light transport aircraft has the same take-off weight as the Y-7 and An-26, its fuel capacity is 1.5 to 2 times that of the former two. Coupled with a turbine with a fuel consumption rate of 0.308 kilograms per hour,  With propeller engines, it is really not a problem for an advanced light transport aircraft to fly a range of 5,000 kilometers.

    only¡­¡­

    "Old Qian~~" Zhuang Jianye closed the car door, then rubbed his swollen forehead, and after feeling a little more comfortable, he said: "I understand your mood, but some things cannot be rushed. If you don't say goodbye,  Yes, when the D-50 was tested, the overhaul interval was 1860 hours. Can you guarantee that it will be the same as on the test bench when it is sent to the power plant?"

    "this¡­¡­"

    Qian Qiang was speechless when Zhuang Jianye said that the data on the test bench is true and credible, but the actual application is another matter. Sometimes the situations encountered are simply not something that the test bench can take care of.

    Of course, this is not the most important thing. The key is that the old problem that plagues Tengfei Aviation Power has never been solved. Even if many advanced composite materials are used, there are still all kinds of Kaspersky. Qian Qiang and others have not thought of ways to solve it.  Solution, but after many attempts, all failed without exception, and in the end we had no choice but to maintain the status quo.

    Seeing Qian Qiang not speaking, Zhuang Jianye reached out and patted Qian Qiang's thin shoulder: "Actually, Lao Lin's side is similar to yours. There is no denying that the top-mounted center wing box has many benefits. Otherwise, there would be nothing on the strategic transport aircraft of the United States and the Soviet Union.  Use this kind of structure? But from another perspective, no other country can make this kind of structure except the United States and the Soviet Union. Why? It¡¯s very simple. The first material cannot keep up, and the second process is not up to standard.¡±

    Qian Qiang frowned. Although he was helpless, he still admitted that Zhuang Jianye was right. The top-mounted central wing box structure proposed by Lin Guanghua was good, but this idea was similar to Qian Qiang's desire to find a turbine front that could withstand 1,600 degrees Celsius.  Just like the temperature of turbine blade materials, there are many insurmountable gaps.

    First of all, the wing box placed on the top is tantamount to increasing the structural weight of the entire aircraft, affecting the flight quality and basic performance of the aircraft; secondly, as the most important main load-bearing structure of the aircraft, the strength of the entire component must be very strong.

    When these two points are superimposed, an irreconcilable contradiction appears, that is, how to find an excellent balance point to reduce the weight of the structure while ensuring strength.

    In this regard, the United States and the Soviet Union have found their own methods and applied them to their own strategic transportation and equipment, such as the United States' C5 "Galaxy" and C141 "Joint Stars"; the Soviet Union's An-124 and IL-76 Du  The roof-mounted central wing box structure is applied to varying degrees.

    Even Europe is lagging behind in this regard, let alone China, where the gap is even greater.

    Under such a big background, even if Ascendas Airlines is an alternative, it cannot withstand the influence of the general environment. At most, it can only touch the edge of the top-mounted central wing box technology.

    Even though there are already many usable metal matrix composite materials on hand, extremely low production capacity and high price are the biggest obstacles to their large-scale use. In addition, a series of processing techniques for new materials also need to be solved urgently.  One of the most important is the crucial electron beam welding process.

    This welding technology, which is crucial in aero-engine and aircraft manufacturing, is currently not available at Ascendas Aviation Manufacturing Corporation. This is why the old engine problems of Ascendas Aviation Power cannot be solved for a long time, and the top-mounted central wing box cannot be substantively  The main reason for research.

    Because without the intervention of this technology, all the beautiful plans of Ascendas Aviation Manufacturing Corporation cannot become reality.

    The most critical reason why the United States and the Soviet Union are able to dominate the world in the field of large aircraft is that they have mastered the manufacturing technology of large-scale electron beam welding equipment.

    If nothing else, Soviet bombers?The pinnacle drawing - the wing box of the 160 strategic bomber is basically welded using large electron beam welding equipment. If it were not like this, the 160 strategic bomber would never have such an elegant body and domineering combat effectiveness.

    "Don't do porcelain work without diamonds. Do you think those three people don't know what our situation is now? They have been working in various production plants all year round, studying equipment from other countries. I don't want to say what kind of experts they are, but they can still be regarded as experts.  He is a senior person, and he is like a mirror in his heart, and if he can avoid revealing anything, he has already given us face."

    Qian Qiang still frowned and thought, Zhuang Jianye added with a wry smile. Qian Qiang immediately raised his head and looked at Zhuang Jianye depressedly: "So, we suffered a loss this time?"

    "How is it possible?" Zhuang Jianye looked at Qian Qiang in surprise: "Although the investment in the aircraft has not been raised, the engine and composite materials can still make pocket money."

    Hearing this, Qian Qiang sighed in disappointment: "That's still a loss. The Navy only has fifteen An-26s. Alas~~~it can only be regarded as pocket money."

    ¡­¡­

    The pocket money in the mouths of Zhuang Jianye and Qian Qiang was very painful in the eyes of the navy and aerospace departments. The D-46ml turboprop engine used for the An-26 modification has the same power and shaft horsepower as the current An-26 equipment.  The engines are roughly the same, but the unit price is 224 yuan, which is 40% more expensive than the turboprop-5 of the same level.

    As for the D-50 used in marine gas turbines, the price is as high as 3.76 million yuan, which is almost the cost of a small torpedo boat.

    The carbon fiber-reinforced aluminum composite materials ordered by the aerospace department are not much better. The quoted price is 1,500 yuan per kilogram, which is 15 million yuan per ton. This price is considered to be a sky-high price among domestic materials.  .

    The two departments said it was a lie if they said it didn¡¯t hurt, but they still gritted their teeth and took out the special funds to spend frantically on Ascendas Airlines.

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