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Chapter 714 C-17 same style

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    What was also incredible was Maxim, who was standing blankly on the edge of the grassland. Forgetting the incredible landing, he actually carried the wounded and then took off in such an incredible way. How far was the taxiing distance just now?

    Four hundred meters or five hundred meters?

    But whether it is 400 meters or 500 meters, as a light transport aircraft with a maximum take-off weight of 32 tons, it can be regarded as a miracle among miracles, so much so that the Y-15plus has been flying away for a while, Maxim  They all felt like they were sleepwalking.

    There is no other way. The scene he just saw has exceeded the coverage he tried, so he can only find the answer from the scriptures.

    The problem is that the scriptures formed more than a thousand years ago cannot describe today's events. Therefore, Maxim spent countless brain cells and found no answer. In the end, he could only look at the cold sky and silently say something that he had suppressed for a long time.  : "How on earth was it done?"

    "Yun-15plus uses a technology called external air blowing flaps." Just as Maxim was muttering to himself, a rude voice suddenly came from behind him. When Maxim looked back, he realized that he had  Zarif, the Pakistani military attache to China, also arrived here on the plane just now.

    It¡¯s just that at this time, Zarif had resigned as Pakistan¡¯s military attache to China and returned to China to serve as the director of the Emergency Management Bureau of the Ministry of Interior of Pakistan.

    Because they both belong to the Ministry of Interior, Zarif and Maxim¡¯s old father are old acquaintances. Of course, they also know the young rich man in front of him who once worked for the Ministry of Interior of Bahrain.

    Maxim didn¡¯t expect Zarif to come over in person, and was a little surprised. When Zarif saw this, he said, ¡°It¡¯s normal that you were too focused on luck just now and didn¡¯t notice me.¡±

    "Uh" Maxim was a little embarrassed, but he and Zarif were old acquaintances, so the embarrassment lasted for a moment before he continued the topic: "What kind of external air-blown flap technology did you mention about the Y-15plus?"  ?what is that?"

    "This" Now it was Zarif's turn to be embarrassed. This awkward term was only learned by Ascendas Group when he was involved in the introduction of the Y-15plus. Later, he was transferred back to China and transferred to  He joined the Ministry of Interior to respond to domestic emergencies, and was not involved in the subsequent introduction of the Y-15plus. Naturally, he did not know what the so-called external air-blown flap technology was.

    But he had already pretended to be 13 just now. If he showed his timidity now, where would Zarif put his old face?

    So he licked his big belly, smiled on his dark old face, showed an expression that didn't understand me, and said something that made Maxim confused again: "What could it be? Of course it is very advanced.  Technology¡­¡±

    As he spoke, Zarif lowered his voice in a serious manner: "I heard that only the Americans had mastered this technology before, and even the Soviets couldn't understand it."

    It would have been fine if I didn't say this, but when I said it, Maxim's head was filled with questions. If Zhuang Jianye, who arrived in Peshawar with the Soaring Medical Team, knew about this scene, he would definitely seize Zarif without hesitation.  With this guy¡¯s neck, how can he pretend to be 13 when introducing products to a rich man?

    Only the Americans have it, not even the Soviets, why don¡¯t you pretend to be like this!

    ????????????????????????????????? Only China¡¯s Ascendas Group knows the most about external air-blown wing flap technology, and others only know a little bit about it, okay?  This is low-key, luxurious, simple but not simple!

    Of course, if Zhuang Jianye really said that, there would really be no one in the world who would dare to come out and kick the tires. The reason is very simple. There are many countries and aviation manufacturing companies that are researching externally blown flap technology, such as the United States.  McDonnell Douglas and Boeing; Antonov and Ilyushin of the Soviet Union; Dassault and Bae of Europe, etc.

    Many of them have completed engineering verification aircraft, such as McDonnell Douglas's yc-15 and Boeing's yc-14.

    Some have also entered mass production. Antonov¡¯s An-72 short takeoff and landing transport aircraft is the world¡¯s first mass-produced short takeoff and landing transport aircraft.

    But the only one that has truly applied this technology to the extreme and is in line with the convenience of modern aviation aircraft maintenance, simple structure and put into mass production is China Ascendas Group's Yun-15plus.

    Unlike another mass-produced short take-off and landing An-72 transport aircraft, the Y-15plus does not adopt the shoulder-mounted engine layout that was very popular in the US and Soviet aviation circles in the 1970s.

    That is to say, the jet engine is placed on the upper part of the wing, and the "Conda effect" is used to form a downward air guide effect on the surface of the wing by the airflow ejected from the jet engine, thereby forming an upward reverse lift.

    The theoretical description of the "Coanda Effect" here is very boring, but the experiment is very simple. Use a spoon to place the curved surface above the flowing water. The phenomenon of the water changing flow direction along the curved surface of the spoon is the simplest Coanda effect.  .

    An-72 transportation?? and Boeing's yc-14 engineering demonstrator are both fans of the "Coanda Effect" and have achieved undoubted success. Both models can achieve it on a runway of 600 to 800 meters when fully loaded.  Normal takeoff and landing.

    Based on this, the Soviet Union even once used the An-72 transport aircraft as the aircraft carrier platform for carrier-based early warning aircraft. In the early 1980s, it developed the An-71 carrier-based early warning aircraft. What they valued was the excellent short-distance takeoff capability of the An-72 transport aircraft itself.  reduce ability.

    However, no matter whether it is the An-72 or the YC-14, they have achieved success, but as the saying goes, success is also a failure. The shoulder-mounted engine layout can maximize the use of the "Coanda effect" to give it the ability to take off and land at short distances.  .

    But this layout also obviously limits the further development of this type of machine.

    The reason is very simple. The fixed engine compartment has poor adaptability and only fixed-size engines can be used. If you want to replace it with a large bypass ratio engine with better performance and a larger thrust-to-weight ratio, it is simply impossible unless the aerodynamic layout is overthrown.  Do it to achieve it.

    In addition, the maintenance work of the engine has also been greatly increased. The wing-suspended layout allows maintenance personnel to perform simple inspections on the engine with only a simple herringbone ladder.

    ¡°But the engine was carried on the shoulders, and the maintenance staff had to climb along the fuselage and onto the wings before they could open the engine cover for inspection, which virtually increased the workload of maintenance support.

    Finally, and most importantly, aircraft with this type of layout have insufficient expansion capabilities. At best, they can only carry two engines. It is not impossible to increase the number to four engines. The key is that the structural strength of the wings must reach a very different state.  The key point is that even if you do this, it is not cost-effective, because the weight of the aircraft is virtually increased, but the performance of the aircraft is reduced.

    This means that this kind of aircraft does not have much room for improvement. It is very difficult to increase the length of the fuselage and expand the mission flexibility like conventional layout aircraft.

    All of the above are the important reasons why the U.S. YC-14 was sadly discontinued and the Soviet An-71 carrier-based early warning aircraft was eventually replaced by the Yak-44.

    In comparison, the path of Y-15plus is much more flexible. Similar to it is McDonnell Douglas' YC-15. This model is unfamiliar to most people, but another model based on this model has become a household name.  That is the US military's C-17 "Global Dominator 3" strategic and tactical transport aircraft that rewrote the rules of military transport aircraft.

    And Yun-15plus uses the same short take-off and landing technology as the C-17!

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