"--Um!"

Under the control of Lou Wuchen, the huge wooden dragonfly, the UFO, tilted its wings at a small angle, guiding the force of the oncoming wind to deflect slightly, and the power given by the wind also changed.

After the change, the fuselage drew an elegant arc in the sky and rushed towards the fantastic and magnificent Rainbow Bridge in the distance!

————————————————

"No! Accurate! Eat! River! Side! Grass!"

That day, Ye Zhang, a young man herding sheep by the river, was struggling with a stubborn lamb. But no matter how hard he tried, he still couldn't do anything about the lamb.

Although the lamb was small, the boy who was looking after it was even skinnier. The boy who had no idea what to do wanted to beat it away, but the whip fell halfway, and after all, he was reluctant to beat the precious lamb so hard that it only became a whip.

A gentle touch.

"Hmph, eat, eat. Don't expect me to find hay for you when you go back home after eating! Stupid sheep!"

The young man threw down his whip in despair, sat down on a big rock, and stared helplessly at the sky.

——Then he saw a scene that changed his life.

In the blue sky, a strange big wooden bird burst into the gorgeous rainbow beside the river with a faint laughter!

It is not that Ye Zhang has never seen flying monks. He has also seen immortals who come and go, but those 'people' really make him unable to have the desired thoughts. Ye Zhang is a very realistic child, and does not look like

The playmates in the village were so full of dreams of becoming immortals.

That's an immortal... Among thousands of people, there may not be even one person with the talent for cultivation...

They are people different from us. It is better not to have strange expectations. The boy accepted this reality.

But today's strange wooden bird gave the boy a different idea - he recognized that the strange bird's trunk was the common big paulownia tree on the mountain, and the rope across the wings was from Aunt Zhou's house in the village.

The wild grapevines next to it... are all familiar and familiar things to young people.

The young man vaguely saw the two figures on the big bird's back. They seemed to be smiling very happily. That joy seemed to have infected Ye Zhang, making his eyes blurry for a moment.

If...if it's these things, am I...

——Can you also use them to fly into the sky?

This idea took root uncontrollably in the young man's heart and sprouted.

Many years later, when the young man who was able to fly freely in the sky talked about the past, he could still vividly recall the incident that changed his life that year - the Shadow in the Sky.

——————————

Interlude:

"Master, Master, why is the rate of monks who have just entered the foundation building stage barely suspended? Is it a setting to facilitate the unfolding of the plot?"

"...Xiaoye, I am very busy as a teacher, so don't disturb me by saying strange words, okay? If you have any questions, go to the third textbook."

"Hey, Master, let's talk about it. Let's talk about it."

"...Do you really want to listen?"

"Listen, listen!"

"...Well, this is because if you want to levitate yourself by pushing the air, the air ejected at the speed V within the unit time t has Ft=mV according to the momentum theorem.

F=G, and the volume of air pushed is speed V times time t times support surface area S1, mass m=SVt*ρ, so Ft=SVt*ρ*V, so the required pushing speed V=√(G

/Sρ).

According to Bernoulli's equation, when the injection speed below is V1, the pressure P on the side should be approximately regarded as a negative pressure of (ρV12)/2, and the speed at which the surrounding air is pushed to replenish the air should satisfy PSt=mV, that is (ρV12

)S2t/2=(V2S2t)*ρ*V2, that is, V12=2*V22

Considering that in the equilibrium state, the amount of air supplemented from the surroundings per unit time should be equal to the air ejected from below, that is, S1*V1=S2*V2, S1=S2/√2

The surrounding area S2 and bottom surface S1 can be regarded as the side area and bottom area of ​​a cylinder. The radius of the support surface under the feet is r, and the height h of the cylinder is equal to the farthest distance that can control the spell module from the body. From S1=2πr*h, S2

=πr2, under the limit of , the maximum radius of the support surface is r=√2*h. If it is larger, the surrounding air replenishment speed will not be able to keep up.

Therefore, if a cultivator with a weight of G wants to levitate himself through flying, the power he needs to consume = FV = G√ (G/Sρ) = G√ (G/πr2ρ) = G√ (G/2πh2ρ)

So when the weight G is 490N, the air density ρ is 1.293kg/m3, and the spell control distance h=0.04m, the required power is about 95.13kw, plus some losses and - Hey, where is the Leaf Man?"

"...Master, Junior Brother Ye just ran away with a pale face."

"Alas...young people are really impatient..."

"Master, if you continue to bully readers like this, they will scare you away."
Chapter completed!