Kyushu Academy of Sciences.
Liu Jinghong and others were busy following up on the aircraft project.
When they really put the aircraft project on the schedule, they discovered just how difficult it was.
Yes, when the aircraft appears in that shape and generates forward momentum, it will indeed generate lift.
But that is only a rough principle, and it also incorporates too much complicated knowledge about aerodynamics, fluid mechanics, structural mechanics, and materials engineering.
When one subject reaches a bottleneck, all academic fields enter a bottleneck. Everyone is looking for a breakthrough, and the opportunity for breakthrough is to cross this hurdle.
It may be difficult for outsiders to understand why developing an aircraft would cause all disciplines to reach a bottleneck.
In fact, if you look at the broad situation, you can find this problem.
A true aircraft is not as simple as an airship. Because the knowledge plane involved is too extensive, it is no exaggeration to say that if the aircraft can be successfully developed and tested this time, it will be a success.
Then the science of the entire world will collectively move up a level.
Aerodynamics, fluid mechanics will get more proof, and the theory with more real data.
Materials science will rise to a new level. Develop aerospace materials that will push New Kyushu's industrial level up a notch.
Dynamics will be taken to the next level.
Because if the radial reciprocating engine succeeds, then the world's power will leap from the steam age to the fuel age in a short period of time.
The upgrade of dynamics to point Arrancar will add more new directions to all knowledge related to dynamics 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, and it is inevitable that Li Zhen does not pay attention to it.
During this period, Li Zhen moved into the Aviation Academy and discussed the fuselage structure with Liu Jinghong and others.
Because of the problems with the radial reciprocating engine, only permutations and combinations are left, and it only takes time to trial and error to draw conclusions.
The School of Materials also requires a lot of trial and error to fuse new alloys into existing alloys. There is no formula, and even Zhang Zhi cannot find the ratio of this aviation material.
After all, in her time, these were considered cutting-edge science. Basically it is all state confidential data.
Li Zhen doesn't seek to reach the level of those countries. He only pursues one that can fly into the sky, is usable, and is safe. But just such a minimum requirement requires a lot of trial and error experiments to support it.
Then the only one Li Zhen can help with is the Aviation Academy.
At least in aerodynamics, the answer cannot be obtained simply by trial and error.
Li Zhen drew a picture on the blackboard. The sketch looked very much like an early fighter jet from ancient times. But the difference is that the wings of this sketch are double-layered.
In addition, it can also 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 later top-level fighters have the power system at the tail.
In conventional aircraft, the nose generates pulling force. The aircraft designed by Li Zhenhe Aviation Institute uses the butt to generate thrust.
Li Zhen tapped the blackboard with chalk: "The first-generation aircraft mainly conceived by Xu Xiufeng is named 'biplane'. Let's focus on this biplane. Liu Jinghong, what do you think?"
Liu Jinghong stood up and frowned: "Master Li. According to the theory of wind resistance, the double-layered wings actually produce greater wind resistance. Moreover, the fuselage is heavier. It will become extremely slow. And This wing is in the middle of the fuselage, and if the counterweight cannot meet the standard, there will only be one consequence."
Li Zhen asked: "What are the consequences?"
Liu Jinghong said: "The aircraft itself is too heavy, and the wind resistance has also increased. If the power is not up to standard, or the engine stalls in the air, there will be a big problem. Either the aircraft will fall vertically, or it will flip over. He somersaulted and fell."
Lin Xiufeng frowned and said: "What Dean Liu said is wrong. You are basing all this on the engine stalling in the air. Then I would like to ask you, if the bi-wing is not possible, is it possible that the engine of the monoplane stalls in the air? , won’t it fall down?”
Liu Jinghong said: "The aircraft with single-layer wings is lighter and more flexible. Therefore, driven by the engine, the speed will be faster. Under the same conditions, if the engine stalls in the air, the aircraft with single-layer wings will glide down. "
Lin Xiufeng said: "I know about gliding. But double-layer wings can also glide; and they are more stable. Now materials limit our imagination, so judging from the current materials, double-layer wings are obviously more stable. You said single-layer wings One-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 when encountering strong winds. Double-layer wings solve this problem. They are safer and more stable."
"What you said is even more wrong. Quality is relative. We can test the maximum load-bearing capacity of a single-layer wing material, and set the dead weight of the aircraft, the weight of the pilot, and the load weight within this limit. These can all be solved . But your double-wing aircraft is stable, but it cannot glide and land at all."
“…”
The two quarreled.
Li Zhen frowned and was thinking deeply. He looked at the aircraft on the blackboard and wanted to grab something with all his strength, but he couldn't grasp the glimmer of light in his mind.
Single-layer wings have the benefits of single-layer wings.
Double wings also have the benefits of double wings.
Zhang Zhi said that during the First World War in ancient times, there were many double-decker aircraft like this. The name is Bumblebee.
But as time went on, the double-winged ones became obsolete.
But Zhang Zhi couldn't explain why he was eliminated. Zhang Zhi's main field is not aeronautics, and the data and principles in 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 single-winged aircraft have become the mainstream, there must be some truth to it.
Maybe it's as Liu Jinghong said. The double-layer wings are stable and can share the weight of the fuselage. But it was too slow and cumbersome.
The wind-breaking efficiency of single-layer wings is obviously more powerful.
The double-layer wings will obviously be twice as long as the single-layer wings. The speed will also be reduced.
Don't underestimate the seemingly slight difference in data.
You know, that's aeronautics. You know, the imagination of the entire world is limited by the current existing power.
If there is insufficient power in the air, the consequences will be extremely serious.
Book recommended to a friend: "Super Egg":
December 25th. Christmas.
A woman from Suzhou and Hangzhou was pregnant for ten months and gave birth to a round egg.
The world is shocked!
All mankind is shocked!
At this point, a powerful Diablo came to the world.
It is - Super Egg!
(End of chapter)