As soon as Yingyin Yan's voice fell, Jiang Xia said to Lu Xiao, "Okay, let it go." ”

Let go?

Lu Xiao's little head was full of question marks, although she didn't understand why Mr. suddenly let her go, and she also suspected that as soon as she let go of her hand, the thing that Mr. made might fall directly to the ground, but she still obediently slowly let go of her hand.

"Huh?"

Others didn't see it, but Lu Xiao, who was holding the paper cover, knew it best!

Her hands had slowly left the paper cover, but the paper cover did not fall directly to the ground as she imagined!

Could it be that you are really going to fly?

Only then did Lu Xiao put down her hands completely, so she could see clearly that after Lu Xiao let go of her hand, the paper cover did not fall to the ground as everyone imagined, but staggered up!

Under everyone's gaze, it slowly flew up at an extremely slow speed!

Yingyin stood up suddenly, excitedly pointed to the paper cover that staggered to the sky, her eyes were almost red, "Fly, really fly?!" ”

Xiang Lian's eyes were even more round, and he couldn't understand what was going on at all.

Didn't Sir say that you have to carefully study the secrets of birds in order to fly?

This......

Is this just a paper cover, half similar to birds?

Not at all!

Could it be that this is another way of lift-off?

And what is the principle of this?!

Xiang Li'an frowned, staring at the paper cover that flew higher and higher, although it flew extremely slowly, and it was also staggering and unstable after flying, but ......

"Sir, can a man fly in this way?"

"Yes." Jiang Xia said with great certainty, pointing to the wobbly super simple version of Kong Ming Lantern flying in mid-air, "This involves another knowledge, buoyancy." ”

"Buoyancy?" When Xiang Lian heard this new term, his mind was full of question marks, "What is buoyancy?" ”

Jiang Xia stretched out his hand and pushed Xiang Li'an, who was coldly pushed and staggered two steps, "Sir?" ”

"I pushed you, do you feel the force coming from me?"

Synergian nodded, "Yes." ”

"Do you think that I have been subjected to the reaction you have given me?"

Yes?

Xiang Li was stunned for a moment, thought seriously for a moment, and then said, "Yes!" ”

Jiang Xia nodded with satisfaction, "You took two steps back because I gave you more power than you gave me." ”

"In the same way, a boat can float on water because the force that water gives to the boat is greater than the force that the ship gives to the water."

Jiang Xia pointed to the Kong Ming lantern that was still dangling in the sky, "A lamp can fly, because the force of the heat is greater than its own weight, so what we see is that it flies." ”

"As long as the heat is big enough, it can carry a lot of weight! Including, people. ”

It's probably such a theory, and if it goes down to detail, Jiang Xia doesn't understand it.

Anyway, that's probably what it means.

Intuitively, it is the difference between Kong Ming lanterns and hot air balloons.

What he has to do is to give Xiang Lian a Kong Ming lantern, and Xiang Lian will give him a hot air balloon.

Xiang Li'an really deserved to be a genius of the Mo family, and he understood Jiang Xia's meaning almost instantly, "In other words, as long as you have enough heat in your pocket, you can take people to the sky!" This is what Mr. once said, as long as the leverage is enough, you can pry up the entire Sanchuan County? ”

Jiang Xia, "...... Well. ”

It can also be understood in this way.

"Sir, rest assured! I'm sure I'll be able to make a paper cover that can carry people to the sky! "Erian thinks he can do it!

According to Mr., as long as the paper cover is large enough, there will be no problem.

The only question is, "But how do you control the direction of flight after flying?" ”

Xiang Li was very concerned about this, their Mo family's wooden kite was because it couldn't be controlled, so it failed in the end, and he didn't want to make something that could only fly but couldn't control it.

Jiang Xia shook his head, "I'm afraid it's not good to control the direction of the hot air balloon." ”

Hearing Jiang Xia say this, Xiang Li'an's whole person was like a frosted eggplant, and his face darkened visibly.

Still doesn't work?

"The direction of the balloon can only be determined by the direction of the wind, but the lifting and landing can be controlled."

"Huh?!" Hearing Jiang Xia's words, Xiang Li'an's eyes lit up, and his eyes stared at Jiang Xia, "Ask Mr. for advice." ”

As he spoke, the paper cover that was still flying in the sky just now fell to the ground and shattered, and the small flame that had not yet been extinguished ignited the entire paper cover and ignited a small fire.

Seeing this scene, everyone present except Jiang Xia turned pale.

If anyone is sitting in it......

The consequences are unimaginable!

Seeing everyone's ugly faces, Jiang Xia couldn't help but shake his head, and said with a smile, "I just put such a small oil lamp, how long can it burn?" Isn't it normal that it falls off when it runs out of gas? ”

Oh, it's just out of gas......

Everyone exhaled in tacit understanding, and their hearts were relaxed.

Only Xiang Li'an had a flash of inspiration, and he seemed to think of something, to control the "force" to control the height!

"Sir, you mean, control the size of the fire to control the amount of heat, so that it rises and falls?"

The corners of Jiang Xia's mouth hooked, and he nodded very satisfied, "Not bad!" ”

Xiang Lian is worthy of being a genius carefully selected by him! Sometimes it's just a casual pudding, and Xiang Lian can understand something from it.

Amazing talent.

To Jiang Xia's surprise, Xiang Li'an thought of more than that!

"The example that Mr. just gave said that the buoyancy of water to a thing can hold a thing up, isn't it the same principle as a hot air balloon, as long as the hull is big enough, not only steel, but even a city can be built to float on the sea?"

"Shhh Ying Yinyan gasped and slowly turned her head to look at the hot air balloon that had just fallen to the ground.

A paper cover can carry itself into the sky with so much heat, and a ship made of steel has enough air to float on water......

It doesn't seem to be a difficult task?

Jiang Xia didn't expect that Xiang Lian actually diverged from the hot air balloon to the ship.

The boat thing......

The ships of later generations were all made of steel, and he really didn't know anything about the draft, load-bearing, and so on.

However, Jiang Xia was able to give Xiang Li'an a positive answer, "Not bad!" You can start with a hot air balloon, and when your father and the others arrive, they can work together on airplanes, iron ships, and so on. ”

"Airplanes?" Xiang Lian was stunned for a moment, and then immediately reacted, "Could it be a flying machine made by imitating birds?" ”

"Well, the boy is coming step by step, don't be in a hurry."

Although he felt that it was almost impossible to build an airplane with the current level of technology, it was ......

Building a hang glider shouldn't be a big problem, right?