After Bernoulli's principle was overturned, humans have also put forward various hypotheses that aircraft can take off.

For example, Newton's second law and third law.

When the aircraft is flying, the wings will have an elevation angle, which will guide the airflow to move downward. Therefore, these airflows will receive a downward force. According to Newton's second law, the wing will receive an upward reaction.

force, so this force holds up the aircraft.

But this theory cannot explain all phenomena. There is also a low-pressure area above the wing. This low-pressure area is also an important factor affecting the lift of the aircraft.

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Others have proposed theories about vacuum.

The formation of a vacuum low-pressure area will cause a pressure difference.

When the aircraft flies forward, due to the bulge in the upper part of the wing, a vacuum-like state is formed in the upper part after the airflow passes through.

The upper airflow will receive a downward pressure to fill the vacuum area, thus forming a lower air pressure area, while the lower air pressure will be greater, which will also form an upward lifting force.

This theory is the most flawless.

But there is a prerequisite, that is, the aircraft must fly first before this pressure difference can be formed.

There is definitely no such pressure difference before the plane takes off, so this theory is obviously wrong.

In short, after the Wright brothers invented the airplane, until now there has been no complete theory that can fully explain why the airplane can take off.

The principle of airplane flight has puzzled mankind for more than a hundred years. To this day, mankind does not know why airplanes can fly.

Chen Bin looked at Li Xuan in confusion, "How is this possible? I remember watching One Hundred Thousand Whys when I was a child. Planes fly because of airflow. This is all common sense."

Li Xuan smiled, "But in the movie "Crash Landing", which was nominated for two Oscars, there was a scene that subverted common sense: the captain made the plane fly up and down when making an emergency landing."

It is absolutely impossible for an airplane to fly upside down if we follow the textbook theory.

But anyone who has watched the military parade knows that planes can definitely fly upside down.

Yingjiang even created a website specifically to criticize these common sense.

Chen Bin looked at Li Xuan doubtfully, "So, why is the book I read wrong?"

Li Xuan nodded, "This popular erroneous theory was very common in the past and was even considered to be the truth."

For a long time, humans have believed that it is Bernoulli's law that makes airplanes fly.

But this theory has been completely overturned since 2012.

In 2012, the Eagle Flying Demonstration Team performed an inverted flight in front of journalists from all over the world at the Arctic Thunder Air Show.

This was a very unscientific performance, but the aerobatic team did it. The plane flew upside down without falling from the sky, and it was even able to continue to climb in the air.

Chen Bin looked at Li Xuan in confusion.

Li Xuan smiled and asked, "Don't you understand?"

Chen Bin shook his head, "I can understand every word clearly, and I understand the meaning when put together, but I just can't figure it out."

"What can't you figure out?" Li Xuan asked with a smile.

"I don't understand a little bit. The plane is obviously ready to take off. How could scientists not have the clearest explanation and the most profound theoretical elaboration on it?" Chen Bin said, showing his hands.

Li Xuan spread his hands, "Maybe scientists know it, but we can't say for sure without announcing it. In short, flying a plane into the sky is a very complicated process. Even now, humans have no way to explain the process of flying in the sky through their own efforts.

This phenomenon, but now that planes can fly into the sky, the answer is not important. Let's continue to look at the wandering albatross. This kind of bird is very rare and generally only appears on the continental coasts of the southern hemisphere.

Many fishermen will never see them again in their lifetime."

"How can I still be in the mood to watch birds now?" Chen Bin complained with his lips pouted, but his head was raised high sincerely.

Typhoon weather like this is a natural disaster, whether it is to humans, other marine life, or seabirds, and there is no resistance.

But for the wandering albatross, it seems like a fish in water.

Albatross need a headwind to take off. In windless weather, they can only float on the water like ducks, or swing their clumsy bodies on land like Donald Duck.

To take off, this clumsy big bird even needs to find a cliff and jump from the edge of the cliff before it can take off.

The albatross in the sky seemed to be particularly happy, and it chirped loudly from time to time.

This kind of windy weather is like going to heaven for it.

With the help of strong winds, the floating albatross can soar across the vast ocean effortlessly, and can even stay in the air for several hours without flapping its wings.

"This thing feels like a kite." A crew member suddenly said.

Li Xuan raised his eyebrows, and it seemed that they really looked alike.

At this moment, the kite-like Wandering Albatross suddenly fell from the sky, head downwards, toward the sea like a kite with its string broken.

Chen Bin was startled and immediately shouted: "Not good."

"Don't make a fuss, it's because the Wandering Albatross has found its prey and is going to fish." Not far away, an older fisherman explained to Chen Bin.

As the elderly fisherman finished speaking, the albatross hit the sea and disappeared without a trace.

Chen Bin blinked, "Are you sure that albatross fell into the sea on its own to catch fish?"

Li Xuan shook his head helplessly, "Don't make such a fuss. All the albatross' food comes from the ocean. It can drill into the water and is very good at diving. Basically, any adult albatross can dive to the bottom of the sea ten times."

Go hunting in the deep sea below meters.”

Having said this, Li Xuan paused for a moment, and then continued: "It is worth mentioning that albatrosses can drink seawater. Their stomachs are very strange. They can not only degrade the salt in seawater, but also absorb water due to weather conditions.

Change and change the type of food.”

As soon as Li Xuan finished speaking, he saw a wave suddenly rising on the sea not far away, and a bird that didn't look very big emerged from the bottom of the water, flapping its wings and floating swayingly.

on the water.
Chapter completed!