Take Off My Aviation Era

Also found to be unbelievable was Maxim, who was standing on the edge of the grass field in a daze. It didn't matter that he landed in disbelief. He actually carried the wounded and took off in such an incredible way. How far did he slide 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 in a miracle, so that the Yun-15plus has been flying away for a while, Maxim I feel like I'm sleepwalking.

There is no way, the scene I saw just now has exceeded the scope of his attempt, and I can only find the answer from the scriptures.

The problem is how the scriptures formed more than a thousand years ago can’t describe the current affairs. So Maxim spent countless brain cells and didn’t find any answers. At last, he could only look at the cold sky and silently say something that was suppressed for a long time. : "How did you do it?"

"Yun-15plus uses a technology called external blowing flaps." Just as Maxim muttered to himself, there was a violent word behind him. Maxim looked back and found that he had Zarif, Pakistan’s military attache to China, also arrived here by plane just now.

Only at this time Zarif has resigned from his post as Pakistan's military attaché 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 belong to the Ministry of Internal Affairs, Zarif and Maxim's old father are old acquaintances, and of course they also know the young local tyrant who once worked in the Ministry of Interior of Bahrain.

Maxim didn't expect that Zarif would come in person. He was slightly surprised. When Zarif saw this, he said: "You were too focused on luck-15plus just now, and you didn't notice that I was normal."

"Uh..." Maxim is a little embarrassed, but he and Zarif are also old acquaintances, and the embarrassment is just that, and then continue the topic: "You just said what the external blowing flap technology used for Luck-15plus? ?what is that?"

"This..." Now it's Zarif's turn to be embarrassed. This slurred term was only when he participated in the introduction of Yun-15plus, and he only learned about it from the introduction of the aircraft model in Ascendas Group. Later, he was transferred back to China. After entering the Ministry of Internal Affairs to deal with emergencies in the country, after the introduction of Yun-15plus, I did not participate in the matter. Naturally, it is not clear what the so-called external blowing flap technology is.

But 13 had already been pretended just now, if he showed his timidity at this time, where would he put Zarif's old face?

So he licked his big belly, and the dark old face laughed, showing an expression that I didn’t understand. By this, he said, "What can it be? Of course it is very advanced." Technology..."

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

It’s okay if I don’t say this, it’s a question mark full of brains when I talked about Maxim. If this scene is known by Zhuang Jianye who is arriving in Peshawar with the take-off medical team, he will definitely grab Zarif without hesitation. This guy’s neck, how can you tell the local tyrants how to install 13 products like this?

Only the Americans have it, not the Soviets. Do you want to pretend like that?

Obviously, only China's Ascendas Group knows the external blowing flap technology best, but other people only know a little bit, OK? This is low-key, luxurious, simple but not simple!

Of course, if Zhuang Jianye really said that, there would be no one who really dared to run out of the playing field in the world. The reason is simple. There are many countries and aerospace manufacturing companies that study external blowing flap technology, such as the United States. McDonnell Douglas and Boeing; Antonov and Ilyushin in the Soviet Union; Dassault and bae in Europe.

Many of them have completed the engineering verification aircraft, such as McDonnell Douglas and Boeing.

There is also mass production. Antonov's An-72 short takeoff and landing transport aircraft is the world's first mass production short takeoff and landing transport aircraft.

However, only the Yun-15plus of China Ascendas Group is the only one that truly applies this technology to the extreme, and is in line with the convenient maintenance, simple structure and mass production of modern aviation aircraft.

Unlike another mass-produced short takeoff and landing An-72 transport aircraft, the Yun-15plus did not use the shoulder-mounted engine layout that was very popular in the American 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 "Kangda effect" is used to form a downward air guiding effect on the surface of the wing, thereby forming an upward reverse lift.

The "Kangda effect" theoretical description here is very boring, but the experiment is very simple. Use a strip of water to put the arc on top of the flowing water, and the phenomenon of changing the flow direction of the water along the arc of the strip is the simplest Kangda effect. .

The An-72 transport aircraft and Boeing’s engineering demonstrator are both fans of the "Kangda effect" and have achieved unquestionable success. Both models can achieve normal take-off and landing on the meter runway under 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. In the early 1980s, the An-71 carrier-based early warning aircraft was developed. What they valued is the excellent short-range start of the An-72 transport aircraft. Degradation.

However, regardless of whether it is an-despite the success, it is the so-called success and failure. The shoulder-mounted engine layout can maximize the use of the "Kangda effect" to make it capable of short takeoff and landing.

However, this layout obviously limits the further development of this type of model.

The reason is simple, the fixed engine compartment is too poorly adaptable and can only use a fixed-size engine. If you want to replace it with a better performance, a large duct with a larger thrust-to-weight ratio is impossible than the engine, unless the aerodynamic layout is overthrown. It can be achieved by doing.

In addition, the maintenance of the engine has also been greatly increased. The wing is suspended, and the maintenance staff can perform simple inspections on the engine with a simple herringbone ladder.

But the engine was carried on the shoulder~www.readwn.com~ The crew had to climb along the fuselage to the wing before opening the engine compartment cover for inspection, which virtually increased the workload of maintenance maintenance.

Finally, and most importantly, this type of aircraft has insufficient expansion capabilities. At best, it can only carry two engines. It is not impossible to increase to four engines. The key is that the structural strength of the wing must reach a very abnormal level. The point is that even if you do this, it is not cost-effective, because the aircraft's own weight has increased invisibly, which actually reduces the aircraft's performance.

This means that the space for this kind of aircraft is not large, and it is very difficult to increase the length of the fuselage like a conventional layout aircraft, and to expand mission flexibility.

All of the above are the important reasons why the United States dismissed sadly, and the Soviet An-71 carrier-based early warning aircraft was finally replaced by the Yak 44.

In contrast, the path of Yun-15plus is much more flexible. It is similar to McDonnell Douglas. This model is generally unfamiliar to people, but another model based on this model is well-known, and that is The U.S. C-17 "Global Master 3" strategic and tactical transport aircraft that has rewritten the military transport aircraft rules.

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