Also found it incredible that Maxim was standing on the edge of the grass in a daze, even if he landed in disbelief, he actually carried the wounded and then took off so unbelievably, how far was the glide just now?

400 meters or 500 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 within a miracle, so much so that the Y-15PLUS has been flying away for a while, and Maxim feels that he is sleepwalking.

There was no way, the scene he had just seen was beyond the scope of his attempt, and he could only find the answer from the scriptures.

The problem is that the scriptures formed more than a thousand years ago can't describe today's events in any way, because Maxim spent countless brain cells and couldn't find any answers, so he could only look at the cold sky and silently say something that had been suppressed for a long time: "How did you do it?"

"The Y-15Plus uses a technology called an external blow flap. Just as Maxim was muttering to himself, a rough voice suddenly came from behind him, and Maxim looked back and found that the former Pakistani military attache in China Zarif had also arrived here on the plane just now.

It's just that at this time, Zarif has stepped down from his post as Pakistan's military attache in China and returned to China to take up the post of director of the Emergency Management Agency of the Ministry of Internal Affairs of Pakistan.

Because they both belong to the Ministry of Internal Affairs, Zarif is an old acquaintance of Maxim's old father, and of course he also knows the young tyrant in front of him who used to work for the Ministry of Internal Affairs of Bahrain.

Maxim didn't expect Zarif to come over in person, and was slightly surprised, Zarif saw this and said, "You were too focused on Yun-15plus just now, and you didn't notice that I was normal. ”

"Uh......" Maxim was a little embarrassed, but he and Zarif were also old acquaintances, so the embarrassment continued the topic just now: "What kind of external blowing flap technology did you just say the Yun-15plus used?

"This ......" this time it was Zarif embarrassed, this awkward term was still when he participated in the introduction of the Y-15plus, only Tengfei Group knew when he listened to the introduction of the model, and then he was transferred back to China and transferred to the Ministry of the Interior to deal with domestic emergencies, and then the introduction of the Y-15Plus was not involved, so naturally it is not clear what the so-called external blowing flap technology is.

But 13 has already pretended to be out just now, if he is timid at this time, where will his old face be placed?

So he licked his big belly, and his slightly dark old face smiled, showing an expression that I didn't understand, and said something that made Maxim misty again: "What can it be......?"

Saying that, Zarif also lowered his voice with concern: "I heard that only the Americans have mastered this technology before, and even the Soviets can't figure it out." ”

It's okay not to say this, but Maxim is even more full of question marks, if this scene is known by Zhuang Jianye, who arrived in Peshawar with the Tengfei medical team, he will definitely not hesitate to grab Zarif by the neck, and introduce the product to the local tyrant, how can he pretend to be like this13?

Only the Americans have it, and the Soviets don't have it, so do you want to pretend to be 13 like this!

Obviously, only China's Tengfei Group knows the technology of external blowing wings, and the others only know a little about it? 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 really dared to run out of the field, and the reason is very simple, there are really many countries and aviation manufacturing enterprises that have studied the technology of blowing flaps externally, such as McDonnell Douglas and Boeing in the United States, Antonov and Ilyushin in the Soviet Union, Dassault and BAE in Europe, and so on.

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

Antonov's An-72 short take-off and landing transport aircraft is the world's first mass-produced short take-off and landing transport aircraft.

However, the only one that really applies this technology to the extreme, and conforms to the modern aviation aircraft's convenient maintenance, simple structure and mass production, is only the Yun-15PLUS of China Tengfei Group.

Unlike another mass-produced short-distance take-off and landing An-72 transport aircraft, the Y-15PLUS did not adopt the shoulder-mounted engine layout that was very popular in the aviation circles of the United States and the Soviet Union in the 70s.

That is, the jet engine is placed on the upper part of the wing, and the "Kangda effect" is used to form a downward air conduction effect on the surface of the wing from the jet engine, thus forming an upward reverse lift.

The theoretical description of the "Kangda effect" here is very boring, but the experiment is very simple, using a basket, the arc surface is above the flowing water, and the flow water changes the flow direction along the arc surface of the strip is the simplest Kangda effect.

Both the An-72 and Boeing's YC-14 engineering demonstrator are fans of the "Kangda Effect" and have been unquestionably successful, with both models capable of normal take-off and landing on runways of 600 to 800 meters with full load.

Based on this, the Soviet Union even once used the An-72 transport aircraft as the carrier platform of the carrier-based early warning aircraft, and developed the An-71 carrier-based early warning aircraft in the early eighties, and what it valued was the excellent short-range take-off and landing capability of the An-72 transport aircraft itself.

However, whether it is the An-72 or YC-14, despite the success, the shoulder-mounted engine layout can make maximum use of the "Kangda effect" to make it have the ability to take off and land short distances.

However, this layout also significantly limits the further development of such models.

The reason is very simple, the adaptability of the fixed engine compartment is too poor, and only a fixed-size engine can be used, and if you want to replace it with better performance, it is simply impossible to have a large bypass ratio engine with a thrust-to-weight ratio, unless the aerodynamic layout is pushed down and redone.

In addition to this, the maintenance of the engine has also been greatly increased, and the wings are suspended, allowing the maintenance staff to do a simple inspection of the engine with a simple herringbone ladder.

But the engine was carried to the shoulder, and the maintenance personnel had to climb along the fuselage to the wings before they could open the engine compartment cover for inspection, which virtually increased the workload of the maintenance support.

Finally, and most importantly, the expansion capacity of this type of layout of the aircraft is insufficient, at best it can only carry two engines, and it is not impossible to increase it to four engines, the key is that the structural strength of the wing should reach a very variable ~~ state, the key is that even if it is done, it is not cost-effective, because the weight of the aircraft has increased invisibly, but it has reduced the performance of the aircraft.

This means that the aircraft does not have much room for upside, and it is difficult to increase the length of the fuselage and expand the flexibility of the mission as in the conventional layout of the aircraft.

All of the above is an important reason why the YC-14 of the United States was disgraced and the Soviet Union's An-71 carrier-based early warning aircraft was finally replaced by the Yak-44.

In contrast, the path of Y-15plus is much more flexible, similar to McDonnell Douglas's YC-15, this model is very unfamiliar to ordinary people, but another model expanded on the basis of this model is a household name, that is, the U.S. military C-17 "Globemaster III." strategic and tactical transport aircraft that rewrites the rules of military transport aircraft.

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