It's just a verbal discussion, and it can't be discussed.

Li Zhen slapped the lesson plan, and Lang shouted:

"All theories are not straightforward in practice."

When the crowd heard this, they stopped talking.

Li Zhen said: "We made all the single-winged planes and double-winged aircraft. Isn't it okay to experiment then? ”

Everyone shouted: "But ...... the engine"

Li Zhen waved his hand: "Don't worry about the engine first." Do the unpowered rack first...... Have you ever flown a kite? ”

When the words fell, everyone's eyes lit up.

"Hahaha."

"Yes. Kite. ”

"Kite flying."

"I know what it means."

"What Li Shi means is to make the frame first, then pull it with a rope, and pull it with a steam cart or a horse. Take to the sky like a kite. ”

"Hey, why didn't I turn the corner. What's the use of verbal discussions, this is the science that requires trial and error and countless experiments to reach a conclusion. ”

“……”

Say it 10,000 times, it's better to do it again.

It's a simple truth.

No one has any experience, no one has ever seen what a real plane looks like, including Li Zhen, who has never seen it, and he just described it verbally from Zhang Zhi, and then imagined it in his own mind.

Just do it.

The Kyushu Academy of Sciences is not bad for money. Under the call of the Aviation Institute, the internal studio began to act.

As for the material.

Don't think about metal materials just yet.

Aircraft made of metal do not belong to the current era.

Because the engine power is too weak, even if the star-shaped reciprocating engine is introduced, the estimated theoretical power is simply not enough to drive the metal fuselage.

After much discussion, Li Zhen decided to use wooden materials to complete the fuselage structure of the aircraft.

Building the fuselage structure out of wooden materials makes the job much simpler. Wood is the easiest to mold, the easiest to sand, with the help of steam tools, in the conditions of existing drawings. In two days, all the parts needed for the aircraft were polished.

The best workers are in charge of grinding the parts. The greatest entertainers are responsible for the plasticity of the wooden material.

Li Zhen and others took the drawings and continued to analyze and analyze the internal structure.

Writing a number on the drawing with a pencil, Li Zhen said:

"In general, the wooden structure still can't withstand the pressure of the wings."

Lin Xiufeng frowned and nodded: "What Master Li said is right. The wings can't be made of solid wood, the solid wood is too heavy, and you can't fly without thinking about it. Unless it is supported by super power, it is obvious that the largest power engine in our world comes from the star-shaped reciprocating engine, which unfortunately has not yet been successfully developed. Motivation limits development ......"

Liu Jinghong was also extremely embarrassed, he did what he said, and he did it with a pat on the head. It's simple.

Excellent carpentry sharpens the wings they want, effortlessly, and down to the millimeter. But the problem is that it comes to mind when preparations for the building of the wing begin.

The wings of solid wood are simply not enough to fly, they are too heavy. Theoretically, it is possible to reduce the weight by thinning the thickness of the wing, but the principle of conservation confirms that if the thickness is reduced, the strength is reduced.

So what to do?

Li Zhen patted his head: "There is a way, you need to try it boldly." ”

"What's the solution?"

"We used steel tubes, or metal tubes, to build the shape of the wings. Then put on a canvas, or an oilcloth. ”

Liu Jinghong frowned: "Oilcloth? Canvas? With cloth, huh? This...... This can be done. ”

Lin Xiufeng's eyes lit up: "This method is good." Metal frame, which enhances the strength and strength is higher than that of a solid wood wing. And the canvas tarpaulin is covered with a lot of weight reduction. It's a good idea, I think it's feasible. ”

Li Zhen said with a smile: "In the frame built of steel pipes, iron bars are used to connect the diagonals, so that the strength of the wing is greatly guaranteed. Even if the fuselage falls apart, the wings will be fine. ”

“……”

Just do what you say.

Li Zhen still underestimated everyone's enthusiastic fantasies about the aviation dream.

Immediately after the abandonment of wooden wings, steel tubes began to be used instead of wings. The thumb-thick steel tube is hot-pressed and heavily pressed into the shape of a wing.

The latest achievement of alternating current in the electromagnetic institute, electric welding technology, supports the connection between metals.

After half a day's work, the wings were formed. When the wing frame was placed in front of everyone, at that moment, everyone had this confidence that it could fly.

The wings with a total length of ten meters and a width of three meters have a total weight of just over fifty kilograms.

The weight was restricted, and everyone began to feel hopeful. Maybe, it really works......

Because the drawings of two different models have been drawn for a long time. The Kyushu Academy of Sciences has industry, capital, and manpower as support, and in just two and a half days, all the parts and components needed for two different types of aircraft have been built.

It's like playing a jigsaw puzzle. No, it's more like playing a game of building blocks.

Even Li Zhen personally went into battle and began to assemble it.

"The wooden fuselage needs to be fixed with steel wire."

"Try not to use rivets and screws. Because it will destroy the tolerance of the wood. ”

"Let's all use steel wires to hold and pull. Although there is a risk of falling apart, there is no better way to solve it. ”

“……”

Monoplane, full weight three hundred and six kilograms.

Biplane, full weight 410 kg.

When the two formed planes appeared in front of everyone, Li Zhen couldn't help but shake his head and sigh.

No matter how restrained it is, when the final product appears, the weight still exceeds the expected limit.

Under Li Zhen's command, everyone began to cover the wing frame.

First, a layer of glue was brushed on the frame, and then everyone carefully pasted a layer of paper on it.

That's right, paper. It's the kind of paper that makes books, but it's a little stronger than that kind of paper, so it's good paper.

Of course, the wings can't just be made of paper. And that's just the first layer.

When the paper is firmly glued to the wings and is soaked in glue to dry. Another layer of glue was brushed on the paper, and everyone began to cooperate to wrap the silk on it.

Then brush another layer of glue on the silk and let it dry again.

After the silk is dried, the wings at this time are no longer frames, but real wings. It looks like it can fly.

But that's just the second process.

He covered the silk with glue and pasted the thinner canvas again. After the canvas was completely glued, Li Zhen and the others wrapped it around the wings with thin steel wires, and all the three layers of materials were firmly and securely.

Just the wings of the airplane, there are three processes.

The first layer is paper. The second layer is silk. The third layer is canvas.

The strength is enough, and the weight is not too heavy.

After all the glue inside the wings had dried, the frames of the two planes, without any power facilities, were formed.

A monoplane wooden aircraft.

A double-winged wooden aircraft.

The length, width and height specifications are all the same.

Li Zhen stood in front of these two planes, and suddenly became a little high-spirited.

In a trance, it seems to have returned to the time when I worked with them on the steam engine......