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Chapter 1226 The Flying Sausage

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    After all, the TNB-19B aircraft has a length of 42.3 meters, a wingspan of 38.4 meters, a maximum take-off weight of 68.7 tons, and a maximum range of 5,620 kilometers.

    Originally planned to be equipped with the WD-66 large bypass ratio turbofan engine with the same 2.5-generation 17 MW core machine as the WD-62mvp high-power turbofan engine.

    The overall architecture is inherited from the WD-60 high-bypass ratio turbofan engine before the Ascendas series, but more mature design and technology are applied. The basic technical indicators are roughly the same as the popular CFM-56 high-bypass ratio turbofan engine of the American General Company.  same.

    "Two wd-66 large bypass ratio turbofan engines are enough to easily send the tnb-19b aircraft with a maximum take-off weight of less than 70 tons into the blue sky to fly freely.

    In fact, this is indeed the case. After all, the maximum thrust of the WD-66 high-bypass ratio turbofan engine has reached 10.8 tons, which is almost the same as the latest improved model of the cfm-56 high-bypass ratio turbofan engine.

    Even the Airbus A320 and Boeing 737, which have a take-off weight of more than 80 tons, can be given extremely excellent power performance by the cfm-56 high bypass ratio turbofan engine. The wd-66 high bypass ratio turbofan engine can also provide tnb-  The same advantages as the 19b aircraft.

    However, to this day, the TNB-19B aircraft does not use a powertrain that can be solved by just two WD-66 large bypass ratio turbofan engines. Instead, it uses four WD-56ML engines with a thrust of only 6.5 tons.  Turbofan engine.

    This is not because China Takeoff is being pretentious and leaving the good ones alone, but because civil aviation engines have extremely high requirements for safety and stability.

    Whether it is the previous Ascendas Group or the current Ascendas Group of China, although it can build a high bypass ratio turbofan engine with the same thrust as the cfm-56 high bypass ratio turbofan engine, it cannot be built due to the differences in materials, design and system integration.  However, China Tengfei has not been able to make its large bypass ratio turbofan engine as stable as the CFM-56 so far.

    After all, for China Takeoff, the development of high-thrust civil aviation large-bypass ratio turbofans is the first of its kind. It is impossible to do it overnight. The entire process of the entire high-thrust civil aviation large-bypass ratio turbofan inside and outside must be considered.  After walking through it, you can officially get started, and then slowly polish it using specific models such as wd-60 and the upgraded wd-66.

    After all, General Motors can make Airbus A320 and Boeing 737 fly for decades with two CFM-56s. If China Ascendas wants to compete with other aviation giants in the future, you can¡¯t let your planes fly with two Teslas.  Is the wd-66 in the crotch running around?

    Therefore, starting from wd-60, Ascendas Group began to conduct testing according to the most stringent standards. The cumulative experiments were a hundred thousand hours, and tens of thousands of modifications were made, so that the later modified models were not even connected to wd-60.  I almost don¡¯t recognize this biological mother anymore.

    So we had to simply rename it, and today we have wd-66.

    However, after the name was changed, the testing standards were also increased. At the same time, with the establishment of China Tengfei, more resources were available, and tests that could not be done before were no longer a problem, so the various requirements were almost  Turning it over and over, adding more and more, almost to the point of complete transformation.

    Let¡¯s take the extreme failure of an engine catching fire and exploding as an example.

    China Takeoff¡¯s requirement for the WD-66 is that if an explosion occurs at any point outside the core aircraft, the engine can still continue to operate safely under the influence of the core aircraft until the aircraft lands safely.

    ¡°Just for this indicator, China Ascendas Aviation Development Department has been testing and revising it countless times for several years, and only then can we get a glimpse of it.

    Because of this, it will take at least three years for wd-66 to truly mature.

    At that time, Ascendas Group was in urgent need of a large-scale platform for testing avionics equipment. European and American civilian airliners would be able to do so. The problem was the Navy's anti-submarine equipment, the Air Force's electronic warfare equipment, the comprehensive avionics system of the next generation fighter aircraft, and the AWACS aircraft.  Radars, these military-type things, are expressly prohibited by European and American aviation giants from being applied to their civil aviation platforms.

    Similar models in Russia are not so good. The problem is that the Russian products are too rough, and the safety and stability are not as good as domestic ones. I feel a little uncomfortable after using them.

    So the Ascendas Group at that time simply started a new business and made it on its own.

    After all, the Ascendas Group was developing an enhanced full-size design of the trj-700 regional passenger aircraft based on the trj-500. The Ascendas Group used the full-size design of the trj-700 regional passenger aircraft as a model. The width of the cabin was inconvenient, which further lengthened the aircraft.  body and wingspan.

    At the same time, move the engine tail pod under the wing.

    However, lengthening the fuselage and wingspan has led to a linear increase in the total structural weight of the aircraft. The thrust of the wd-56ml turbofan engine originally used on the trj-700 regional passenger aircraft was obviously not enough, and the wd-66 at that time was not as mature as it is now. Why?  manage?

    Lin Guang, who was in charge of this project at the time?Learning from Lao Maozi's approach, if the thrust is not enough for the engine, add two more to make it a four-engine engine. Wouldn't the thrust increase?

    Although simple and crude, it is very effective.

    As for the four engines that cost too much in terms of fuel consumption and maintenance, and had some shortcomings that outweighed the gains, neither the Ascendas Group at the time nor China Ascendas today really cared about it. After all, the TNB-19B was just a test verification aircraft. In addition to the unavoidable stability issue,  In addition to performance and safety, the most important thing is that the cost of each modification of the tnb-19b is not low. In the process of disassembling, installing and disassembling various internal equipment, maintaining two more engines is really nothing.

    However, although the four wd-56ml turbofan engines can lift the tnb-19b, the thrust of the wd-56ml turbofan engines is too small after all. In addition, the 42-meter-long fuselage of the tnb-19b aircraft still uses  The 3.5-meter-wide diameter of the TRJ-700 regional airliner makes the entire fuselage particularly slender, making the already small WD-56ml turbofan engine even slimmer.

    So many people in the aviation industry will make a joke when they see TNB-19B: "It won't be driven by 5 APUs (auxiliary power units), right?"

    Of course, compared to the five APUs, the TNB-19B aircraft is still called a sausage.

    The body is really long and slender, and it really looks like a sausage.

    But whether it¡¯s a joke about five APUs or a joke about sausages, when there are no planes available in the country to go to the Balkans to pick up Chinese people there.

    This atypical aircraft with emergency characteristics is the most suitable model, because the TNB-19B aircraft is fundamentally an expanded version of a civil aircraft, with many technologies from the TRJ-700 regional passenger aircraft applied to it.  Even the spare parts of the fuselage of the two models can be used to a certain extent.

    In addition, the more important thing is the flight range. Although it is not possible to fly directly from the eastern part of the country to the Balkan Peninsula at 5,620 kilometers, it is more than enough from the border areas.

    Even if it is impossible to fly to Belgrade via Turkey for various reasons and needs to go around the Black Sea area of ????Russia, pass through Romania and enter Belgrade, leaving a big circle, the TNB-19B aircraft can still easily overcome it.

    Based on these rigid indicators, after reviewing the report submitted by Zhuang Jianye, the superiors immediately agreed to the request, began emergency modification of the TNB-19B aircraft, and then flew to Belgrade.

    As for the effect

    The leader of the foreign affairs department who had just landed summed it up in one sentence: "At that time, they saw that our aircraft was manufactured by our own country, and all those countries outside the region who wanted to watch the excitement turned green in the face!"

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