My item has an upgrade panel

Chapter 9 Paper Plane Hovering in the Air

"Do you have time for NO.13 in the middle of the month?"

While driving home, Tang Rui received a call from his classmate Zhou Tao.

They are father and son in the same dormitory, so there is nothing to say about their relationship.

"If you get married, you have time. If you don't get married, you don't have time."

Tang Rui then replied.

"Fuck off... Dad is an unmarriageist, how can he get married."

"Ha ha."

"Don't talk about this with you, next Saturday will be No. 13, the model club of our alma mater and the model club of China Southern Airlines jointly organize an event.

The flying airspace is applied by China Southern Airlines. Our alma mater is out of the field. There is no height limit. You can fly freely. We graduates can also participate. Are you going? "

Is there such a good thing?

He is worried that there is no place to test the various performances of the drone.

Today's test flight is just a test of the photoelectric system.

As for the performance of the UAV's limit altitude, limit speed, minimum stall speed, climb rate, etc., there is no way to test it.

"Go, where is the place?"

"Over there at Xianlin Zijin Academy."

"I know, kneel down."

"roll."

After hanging up the phone, Tang Rui still had a smile on his lips.

Although the relationship between the two is very strong, they don't usually communicate much.

After all, everyone has graduated.

Each has its own thing.

He opened his own online store and engaged in self-media, which is relatively easy and free.

People like Zhou Tao whose family is not from the local area but choose to stay in Jinling are the most tiring.

Not to mention how tiring it is to go to work, and after paying the rent, there is not much left over the money I earn every month.

Not to mention the need to eat, drink, shop, and get out and relax once in a while.

It's good to be able to use the money you earn, and you don't have to think about saving money.

Everyone is usually busy with their own affairs, and only when they are in a bad mood and have accumulated too much negative energy in their hearts, and need to talk and vent, do they call and ask someone to go out for a drink together.

Under normal circumstances, Tang Rui would play the role of adding salt to the opponent's wounds.

In his words.

This is called fighting poison with poison.

Although he will be drunk in the end, he is still very happy with his venomous tongue.

Back to the neighborhood.

After parking the car, I struggled to get the model plane upstairs.

The first thing Tang Rui did after returning home was not to pack his things, but to take a shower.

It rained all over.

I was sweating again.

The whole body is sticky and very uncomfortable.

ten minutes later.

After taking a shower, Tang Rui sat on a chair with a bath towel on, crossed his legs, and drank an ice coke in his hand.

Dried half a bottle in one go.

belch!
Comfortable.

But when he saw the paper airplanes all over the floor, his mood suddenly changed.

"What to do with these paper airplanes?"

Throw it away, waste it.

Don't throw it away, there is no place to put it.

Paper airplanes cannot be sold, at most they can only be sold as waste paper.

and many more……

It seems that it may not be sold.

Tang Rui picked up a paper airplane at his feet and looked at the system panel on it.

[Item: Paper Airplane]

【Experience: 0/20】

【Source: 0】

There is very little experience to upgrade, only 20 experience points are enough.

Try the effect of the upgrade first.

"Ha~"

He breathed out at the nose of the paper plane and threw it.

The paper airplane flies smoothly in mid-air.

The flight path is like drawing a straight line in the air.

Ding!
The paper airplane hit the mirror of the shoe cabinet and landed.

Tang Rui got up, ran to the shoe cabinet, and picked up the paper airplane on the ground.

[Item: Paper Airplane]

【Experience: 6/20】

【Source: 0】

All of a sudden, 6 points of experience have been raised, and it can be upgraded after flying three or four times.

Not much to say.

carry on.

Throw it lightly, and the paper airplane flies out again.

This time it may be due to the impact of the nose before, which caused the flight path to be a little crooked, but it didn't affect anything.

Pick up the paper airplane again.

This flight has added 7 experience points, not bad.

uuuuuuuuuuuuuuuuuuuuu...

After two more flights, the experience value of the paper airplane exceeded 5 points, reaching the upgrade standard.

Tang Rui directly clicked to upgrade.

Swish!
A gleam flashed.

The paper airplane has been upgraded.

[Item: Stable paper airplane +1]

【Experience: 5/40】

【Source: 0】

He picked up the paper airplane and looked it over carefully. It seemed that nothing had changed, but it seemed to have changed a little bit.

He really couldn't tell what had changed.

In the prefix on the system panel, the word "stable" also appeared.

After Tang Rui frowned, he threw out the paper airplane again.

He wants to see the effect of the upgraded paper airplane.

call out……

The paper airplane drew a standard horizontal line in the air and flew straight towards the window.

It seems that nothing has changed.

The previous paper airplane also flew like this.

Just when he was a little disappointed.

A gust of wind suddenly blows through the window.

The paper airplane that was flying towards the window suddenly paused at this moment, and then slowly backed up.

Grass!
Tang Rui was dumbfounded.

While he was stunned, the paper airplane that was slowly retreating stopped after rising ten centimeters in height, just hovering in mid-air stably.

Just ten seconds passed.

The wind blowing in through the window is reduced.

The paper airplane hovering in the air flew forward again, and slowly descended while flying.

But before the paper airplane landed, another gust of wind blew in through the window.

Then the wind.

The paper plane slowly backed up again, and raised its height, and finally hovered in the air again.

See here.

Tang Rui's mouth twitched unconsciously.

Is this magic?
Yes.

This is the magic of aerodynamics alone.

At this moment, Tang Rui already wanted to understand why the paper airplane would reverse, rise and hover.

In theory, if you want to make the paper airplane achieve such an effect, you must first ensure one thing.

That is the folded paper airplane, with complete gravity balance on both sides of the central axis.

That is, the weights on the left and right sides of the central axis are absolutely balanced and exactly the same.

And this consistency is not only about the weight, the shape and angle of inclination of the wings must also be exactly the same.

Secondly, it is the center of gravity of the paper airplane.

What he folded was a canard paper plane. Normally, the center of gravity of a canard plane is between the canard and the wing.

But the problem is, he is a paper airplane.

The overall center of gravity is on the nose, very forward.

As we all know, the more forward the center of gravity of the aircraft, the more stable it is, and the easier it is to fly in a straight line.

In this case, a forward center of gravity, perfect balance, identical lift on both wings, an aerodynamic body, plus the ultra-light weight of the paper airplane itself.

All of these add up to achieve a perfect balance of lift, drag and gravity.

That's why paper airplanes can hover in the air.

Tang Rui picked up a paper airplane that he folded by himself and hadn't been upgraded with the system, and threw it towards the window.

call out……

The paper airplane could draw a straight line at first, but after approaching the window, facing the wind blowing in from the window, it immediately started to deviate, and finally hit the wall.

For this situation, he is not surprised at all.

It is impossible to achieve that ideal state without a paper airplane optimized by the system panel.

After all, it is handmade.

There is no perfect balance.

After a while.

The wind from the window stopped.

The paper airplane hovering in mid-air also slowly glides down.

Tang Rui walked over and picked up the paper airplane.

[Item: Stable paper airplane +1]

[Experience: 58/40 (upgradeable)]

【Source: 0】

Unexpectedly, this gust of wind not only made him discover the awesomeness of the paper airplane, but also filled up the experience of upgrading.

There is nothing to hesitate about.

Just click Upgrade.

Swish!
With a flash of light.

The shape of the paper airplane has become more aerodynamic, and there are even two gaps in the tail. Matching the curvature of the upper wing, it even becomes two horizontal tail fins.

[Item: Stable paper airplane +2]

[Experience: 18/? (not upgradeable)]

【Source: 0】

After reading the upgraded panel, Tang Rui found that the paper airplane could no longer be upgraded.

It's okay to think about it.

After all, it is just a paper airplane. The first upgrade optimized the overall structure, and the second time the body shape was adjusted.

Without strengthening, there is no room for improvement of the paper airplane.

As for reinforced paper airplanes?
impossible.

Origin points are still very precious, he will not waste precious origin points on paper airplanes.

The current paper airplane is amazing enough.

Tang Rui picked up a few unupgraded paper airplanes from the ground and threw them towards the window.

He plans to get a few more upgraded paper airplanes, and then shoot a video of the paper airplanes hovering in the air.

This kind of strange video, even if it is fake, many people like to watch it.

Not to mention he is real.

When the time comes to upload the video and put the paper airplane on the shelves by the way, there should be quite a few people buying it.

(End of this chapter)