Perhaps because there are not many people who want to obtain a helicopter pilot license, Zhou Yu had just expressed his intention when the other party warmly invited him to the club for an interview.
Zhou Yu naturally would not refuse this.
After asking the little princesses to get in the car, he followed the navigation and headed directly towards the club.
Perhaps due to security considerations, the club is not located in the city.
Although the distance was not far, there were few vehicles on the road out of the city. After about an hour, the group arrived near their destination.
Before Zhou Yu even pulled off the main road, the little kid in the back seat was already leaning over the window excitedly, exclaiming, "Little Nianjun, look! That airplane seems to be floating in the sky."
Hearing the little milk ball's exclamation, the other little princesses all stretched their heads and looked up at the sky.
When they saw the situation in the sky clearly, they couldn't help but exclaim in surprise.
"What the hell is going on? Why do the helicopter's propellers seem to have stopped turning?"
"It seems to be true. Will the helicopter fall down?"
"It's not like it fell down. Didn't you see it flew away?"
"How can a helicopter fly if the propellers aren't even spinning?"
"No, why do I feel like the propeller is spinning backwards?"
…
The little princesses were talking at once, expressing both worry and curiosity.
But no matter how hard they thought, they couldn't figure out what was going on.
Zhou Yu, who was driving, did not see the scene in the sky.
However, he knew what was going on based on what the little princesses described.
Out of curiosity, he even searched for it online.
Seeing the little princesses all looking at him eagerly, he smiled and said, "The helicopter's propeller may appear to be stationary or even spinning in reverse, but it's actually spinning at high speed. The reason you didn't notice it is because your eyes are deceiving you."
"The eyes are deceiving us? Why should they deceive us?"
When the little princesses heard this, they immediately became interested.
Even Li Lizhi and Yuzhang had curiosity written all over their faces.
When Zhou Yu heard the follow-up question, he did not try to be mysterious, but explained directly: "This is because the human eye's visual system has the characteristic of maintaining image stability.
Our eyes and brains automatically perform rapid image processing to control for movement and change in our surroundings, making us perceive our visual scene as static.
When we look at a helicopter propeller, it's spinning very fast, but if the speed is too fast for the human eye to process, we'll perceive it as stagnating.
In addition, the airflow generated by the rotation of the propeller will also affect the vision.
When an airplane is flying, the rotation of the propeller causes turbulent movement of the surrounding air, generating airflow.
These air currents disrupt the propagation of light around us, causing the image we see to be blurry and giving us the illusion that the propeller is moving slowly.
This is the case with the propeller blades you just saw.
In fact, this phenomenon often occurs in daily life. For example, on the road, you will see the tires of a car traveling at high speed slowly rotating in the opposite direction.
Dragonflies and bees seem to be hovering in the air, and it seems that their wings are not moving, but in fact they are flapping their wings very fast."
Zhou Yu said a lot in one breath.
Although the little princesses may not fully understand what is being said, it is natural to instill the knowledge into their brains first when there is such an opportunity to popularize science.
When their knowledge reserves are enriched, they will naturally be able to integrate some of the half-understood knowledge.
This is like asking a child to recite ancient poetry. Without seeing the scene described by the poet or encountering the poet's situation, the poetry is just knowledge.
One day in the future, when you really see "the setting sun and the lone wild goose flying together, the autumn water and the sky the same color", "the waterfall drops three thousand feet straight down, as if the Milky Way falls from the sky", that kind of throbbing will go straight to your soul.
But if we hadn’t memorized and accumulated knowledge as a child, when we saw such a shocking scene, we would probably just shout “Wow, that’s awesome!”
The facts were indeed as Zhou Yu expected.
After listening to his explanation, the little princesses were all confused.
But before they could continue asking questions, their attention was drawn to the roar outside the car window.
At the same time, three red training planes also flew quickly from the end of the wheat field in the distance.
The strong wind caused by the propeller turned the wheat fields into surging waves.
Rumble~
The helicopter flew over the car, and the huge roar and the sound of the wind sweeping past made all the little princesses excited.
The car drove forward along the road, and after turning a corner, a huge arch appeared in front of everyone.
Above the archway, the words "Yunyi Flying Club" were written in large letters.
On both sides of the arch are statues of helicopters.
The car had just arrived in front of the archway when a middle-aged man in a flight jacket trotted over to greet us. "Hello, Mr. Zhou, right? I'm Coach Zhang from the Yunyi Flying Club. We've spoken over the phone before."
"Hello, Coach Zhang, I'm Zhou Yu."
Zhou Yu got out of the car and shook hands with the other party, while also observing the surrounding environment.
Coach Zhang, who was standing opposite, saw this and quickly introduced with a smile, "Mr. Zhou, our club is far away from the city, and the surrounding terrain is very flat, which is very suitable for beginners to practice.
The club's flight camp consists of multiple parts including an aircraft runway, hangar, member club, office and living facilities, covering an area of nearly 500 acres.
We offer helicopter, fixed-wing aircraft, powered trike, hot air balloon and other aviation flight experiences and pilot training programs year-round.”
Coach Zhang made a gesture of invitation while explaining.
Professional yet polite, Zhou Yu had a very good impression.
As the group walked into the club, the little princesses' attention was quickly attracted by the helipad not far away.
There are planes parked on the apron, and planes are also landing and taking off.
The whirlwind stirred up by the propeller picked up a few pieces of grass, which reflected blurry images on the sun-baked ground.
Seeing everyone's eyes looking towards the apron, Coach Zhang quickly and enthusiastically introduced: "This is the training aircraft of our flying club, the model is Robinson R44.
The Robinson R44, developed by Robinson Helicopter Company, is a high-performance and highly reliable helicopter.
The helicopter uses a Lycoming Q-540 piston engine with a maximum power of 260 horsepower, a cruising speed of up to 210 km/h, a maximum range of approximately 645 km, and a maximum ceiling of 4,270 meters.
Due to its powerful performance and high reliability, it is very suitable for use in flight training, aerial photography, aerial forest protection and other fields.
There is a display prototype here, Mr. Zhou can take a look at it first."
As he said this, he made a gesture of invitation again.
Zhou Yu didn't rush to catch up after hearing this. Instead, he looked at the apron and asked, "Our flying club should have this model of helicopter for sale, right?"
Coach Zhang: ???
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