The altitude is 3500 meters, the speed is 170 kilometers, the route is correct and there is no error.

With his eyes fixed, Zhou Hai's face looked solemn and serious, his voice was strong and calm: "Remember, Master."

"What is the definition of stall?" Li Fu nodded and said casually.

Zhou Hai's theoretical definition of stall came to his mind, and replied: "The lift coefficient of the aircraft increases and increases as the angle of attack increases. When the angle of attack increases to a certain angle, the lift coefficient does not rise but falls, resulting in the lift of the aircraft less than the gravity of the aircraft. In the end, the wing loses the pressure difference and loses lift, resulting in a fall. This phenomenon is called stall."

Li Fu continued to ask: "What is the meaning of the lowest speed?"

"The lower the minimum speed, the shorter the take-off and running distance, and the shorter the corresponding airport runway, greatly reducing the ground residence time and improving safety and mobility." Zhou Hai replied without hesitation.

"What's the point of being good at low altitude and low speed performance?"

"Whether the performance of low-altitude and low-speed is an important indicator for measuring the performance of the fighter. Generally speaking, the performance of low-altitude and low-speed performance means stable flight status, stable ground attack, high lift coefficient, excellent comprehensive maneuverability, high airflow resistance, and excellent low-altitude and ultra-low-altitude flight status."

Zhou Hai's face was calm, his words were powerful and clear, and he replied slowly: "The poor performance at low altitude and low speed means that the plane crash is prone to crash."

Crash.

Yes, that's right.

Low-altitude and low-speed performance are poor, and there is only one consequence - it is easy to crash.

Of course, this description is more euphemistic, using professional aviation terms to describe it, namely, "flying coffin board".

Coincidentally, the F-104 supersonic fighter equipped in the history of the US Air Force was awarded this title by the air force of various countries.

Low-altitude and low-speed performance is an important indicator for measuring the maneuverability and performance of fighter jets.

"good."

When Li Fu heard what Zhou Hai answered, he praised him, but did not continue to set questions and test, maintained a horizontal posture, and flew along the scheduled route.

Maintain a cruise speed of 170 kilometers per hour, with an altitude of 3500, and the direction is north, and the destination is - Danzhen training base 580 kilometers away.

As for Zhou Hai's previous ideas and maneuvers, all of them were not realized.

Imaginary plane flight?

It does not exist.

It's really just imagine.

However, this is always a beautiful starting point. After all, he has been ahead of flight students of the same age in the aviation school for three years, and he is not in a hurry.

The following flight journey was quiet and dull, and Li Fu kept flying smoothly and did not continue teaching.

Zhou Hai gradually restrained his emotions, adjusted his mentality, returned to calmness, and accepted his situation of being about to take the phone.

Excitement, joy, expectation, these emotions have disappeared, only a calm heart.

The sky is slightly dark.

The unique roar of the front piston-6 star nine-cylinder aviation engine resounds through the sky.

...

In a blink of an eye, it was already afternoon.

After about three and a half hours of flight, carrying two people's first sixth class, spanning 580 kilometers, flying to the outer airspace of Dan Town Training Base. At this time, the airborne fuel was only 10%.

The ground, the Danzhen training base is covered with silver, and comes into view, the iconic straight runway and towers with high erected radar antennas, as well as low bungalow buildings.

At the edge of the airport runway, a military green first-class teaching six parked in an orderly manner and lined up.

"Buzz!"

In the dim sky, two first sects formed a two-plane formation, passing by hundreds of meters below Li Fu and Zhou Hai, flying freely, with a huge roar coming out.

On the west side of the base, six first-class teachings form a triangular formation, with a huge momentum and particularly spectacular.

"Call the tower, trainer plane No. 12 requested landing."

Li Fu held the joystick and slowly lowered the flight altitude. The nose of the aircraft faced the base base runway. He opened the airborne military radio communicator with his hand, connected to a dedicated encrypted communication channel, and called the ground tower.

"Buzz!" Suddenly, Zhou Hai, who was observing the ground base, his eyes condensed and the sound of engines with different rhythms came from his ears.

"Master!"

Zhou Hai looked up at the sky and saw a Chu Jiao Liu, numbered No. 11, like a sharp eagle, diving towards him with great momentum. The front hydraulic double-blade propeller formed a afterimage. He was shocked and quickly reminded Li Fu.

What is this to do?

Something happened?

Just when the height difference between the two aircraft was only about 30 meters, the first trainee suddenly rolled right and flipped three times in a row from the middle to fly to the right side of the fuselage, then leveled and stabilized, and flew together.

Bold and accurate.

After some operation, the distance between the two machines was only less than ten meters.

"Guru..." Zhou Hai swallowed his throat, stared at his eyes like a copper bell, and through the protective glass of the cockpit, he clearly saw the front seat of the first sixth junior high school teacher numbered 11 on the right side of the fuselage, sitting a flight instructor about forty years old.

In the back seat is a young flight attendant wearing a leather hat, his face calm and calm, without any fluctuations.

Li Fu looked to the right, stabilized the body, ignored it, looked calm and said lightly: "Oh, it's okay, that old guy's way of greeting."

"..." Zhou Hai was stunned and confused when he saw this.

this,

this,

Is there any such way of greeting?

Such a unique way of greeting completely shocked Zhou Hai.

What a terrible and brave man who dares to fly like this?

At the same time, the sound of the base tower sounded in the dedicated encrypted communication channel: "Training plane No. 12, northwest wind, wind speed level 3, gusts level 5, field pressure 1014, landing, runway No. 1 has been cleared."

"I received it on the 12th and am ready to land." Li Fu's voice was calm.

"Old Li, long time no see, are you here to pick up the rookie so soon?" At the same time, the slightly hoarse voice of the No. 11 flight instructor came from the encrypted channel.

Li Fu's eyes were locked at the base No. 1 runway, and his words were stable and powerful: "Fan Goudan, your skills have declined a little. Usually, they would be about eight meters, but now they have to have ten meters?"

"Old squad leader, I said, don't call me Fan Goudan!" The huge roar of the flight instructor came from the radio channel.

Li Fu said lightly: "Oh, Fan Goudan, you still owe me a meal, when will you pay it back?"

“…”

A noise came from the radio channel.

The No. 11, the first sixth student who was flying on the right, raised the head of the machine and rolled downward to the right, flew out a large angle arc, and then left.

"Ha!" Li Fu sneered, and while lowering the altitude to face the closer and closer runway, he said to Zhou Hai: "This old guy is Fan Erqing, the base flight instructor, and his flight skills are average. If you encounter it, don't be polite, and fight me hard."

“…”
Chapter completed!