Rising: Ten Thousand Years Chapter 319: : single layer, double layer
Kyushu Academy of Sciences.
Liu Jinghong and others are struggling to follow up the aircraft project.
When they really put the aircraft project on the agenda, they realized how difficult it was.
Yes, when the aircraft appears in that shape, after generating forward momentum, it will indeed generate lift.
But that's just a general principle, and there are too many complicated knowledge about aerodynamics, fluid mechanics, structural mechanics, and material engineering.
A discipline has fallen into a bottleneck period, which has caused all academics to enter a bottleneck. Everyone is looking for a breakthrough, and the opportunity for a breakthrough is to pass this hurdle.
It may be difficult for outsiders to understand why the development of an aircraft will lead to a bottleneck in all disciplines.
In fact, you can find this problem by looking at the situation in a broad sense.
A real aircraft is not as simple as an airship. Because the plane of knowledge involved is too extensive, it is no exaggeration to say that if the aircraft can be developed and tested successfully this time.
Then the science of the whole world will collectively go up a step.
Aerodynamics, fluid mechanics will get more proofs, and more actual data theories.
Materials science will rise to a new level. Aerospace materials are developed, and these materials will push the industrial level of New Kyushu up a notch.
Kinetics will be taken up a notch.
Because if the radial reciprocating engine is successful, the power of the world will span from the age of steam to the age of fuel in a short period of time.
The upgrade of dynamics will add more new directions to all knowledge related to power in New Kyushu.
After that, people's understanding of the world will improve.
It can be said that this seemingly simple aircraft project actually covers an extremely wide range, so Li Zhen can't help but pay attention to it.
During this period of time, Li Zhen moved into the Academy of Aviation and discussed the fuselage structure with Liu Jinghong and others.
Because of the problems with the radial reciprocating engine, there are only permutations and combinations left, and it only takes time to make a conclusion by trial and error.
The School of Materials also needs a lot of trial and error to fuse new alloys with existing alloys. There is no formula, and even Zhang Zhi can't find out the ratio of this aviation material.
After all, in her era, these were considered high-tech science. It is basically state secret data.
Li Zhen doesn't want to be able to reach the level of those countries, he only wants to be able to fly to the sky, can be used, and is safe, that's all. But just such a minimum requirement also requires a lot of trial and error experiments to support it.
Then Li Zhen is the only one who can help.
At least in terms of aerodynamics, the answer cannot be obtained simply by trial and error.
Li Chen drew a picture on the blackboard. The sketch looked very much like an early fighter jet in ancient times. But the difference is that the wings of this sketch are double-layered.
In addition, it can be found that this aircraft, like the airship, follows the inertial thinking of the airship. The power unit is placed at the rear.
If the power of early fighter jets in ancient times came from the nose, then the engine system in the middle period was on the wings.
Only in the late top fighter jets, the power system is at the tail.
In conventional aircraft, the nose generates tension. However, the aircraft designed by Li Zhen and the Aeronautics Institute uses the buttocks to generate thrust.
Li Zhen tapped on the blackboard with chalk: "Xu Xiufeng mainly conceived the first-generation aircraft, named 'biplane aircraft'. Let's focus on the two wings. Liu Jinghong, what do you think?"
Liu Jinghong stood up, frowned and said: "Mr. Li, according to the theory of wind resistance, the double-layered wings actually produce greater wind resistance. And the fuselage is heavier. It will become extremely Slow. And this wing is in the middle of the fuselage, if the counterweight cannot meet the standard, it will only cause one consequence.”
Li Zhen asked: "What are the consequences?"
Liu Jinghong said: "The plane itself is too heavy, and the wind resistance has also increased. If the power cannot meet the standard, or if the engine stalls in mid-air, there will be a big problem. Either the plane will fall vertically, Or it will turn somersault and fall."
Lin Xiufeng frowned and said, "Dean Liu's words are wrong. All of yours is based on the condition that the engine is turned off in the air. Then I would like to ask you, if biplanes are not acceptable, is it a monoplane? If the air engine is turned off, it won't fall down?"
Liu Jinghong said: "The aircraft with single-layer wings is lighter and more flexible. Therefore, under the impetus of the engine, the speed will be faster. Under the same conditions, if the engine is turned off in the air, then the aircraft with single-layer wings will glide And down."
Lin Xiufeng said: "I know about gliding. But the double-layer wing can also do gliding; and it is more stable. Now the materials limit our imagination, so from the current materials, the double-layer wing is obviously more stable. You The single-layer wings are not stable enough. In the air, the wings have to bear the weight of the aircraft. If the wings are not strong enough, the wings may even be broken in strong winds. The double-layer wings solve this problem. It is safer and more Stable."
"What you said is even more wrong~IndoMTL.com~Quality is relative. We can test the maximum load-bearing capacity of a single-layer wing material, and set the weight of the aircraft and the weight of the pilot within this limit, and Load weight. These can be solved. But your double-wing aircraft is stable, but it can't glide and land at all."
“…”
The two quarreled.
Li Zhen frowned and was thinking deeply, looking at the aircraft on the blackboard, trying to grab something with all his strength, but he couldn't catch the dawn in his mind.
Single-ply wings have the benefits of single-ply wings.
Double-layer wings have the benefits of double-layer wings.
Zhang Zhi said that during the First World War in ancient times, there were many such double-wing aircraft. The name is Bumblebee.
But the further it develops, the double-winged ones will be eliminated.
But Zhang Zhi couldn't explain why they were eliminated. Zhang Zhi's main focus is not aeronautics, and the data and principles of aeronautics are not something you can find online.
But Li Zhen knew that there must be a reason for being eliminated. Everything in the world is survival of the fittest. Since the double-winged Hornet has been eliminated and the single-winged aircraft has become the mainstream, there must be some truth.
Maybe it's just what Liu Jinghong said. The double-layer wings are stable and can share and reduce the weight of the fuselage. But it was too slow and clumsy.
Single-layer wings are obviously more effective in breaking wind.
A double-layered wing is obviously twice as large as a single-layered wing. The speed will also be reduced.
Don't underestimate the seemingly slight difference in data.
Know that's aeronautics. You must know that the imagination of the whole world is limited by the current existing power.
If you lack power in the air, the consequences are extremely serious.
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