Suddenly, after the L-15C Falcon Gaojiao fell to a height of about seven or eight hundred meters, as the fuselage accelerated by diving, the high-speed air flow crossed the surface of the wing, and the left and right wings regained a certain degree of pressure difference, and the fuselage changed from a runaway state to a semi-runaway state, and the rotation state slowed down.

After another second, as the speed increases to 200 per hour, the air flow returns to normality, the flaperon system and rudder return to aerodynamic efficiency, the body returns to a controllable state, and the rotation state is eliminated.

"Buzz!"

The screaming sound of the engine spread throughout the sky, Yang Xiaolong gently pulled the lever, stepped on the rudder with his right foot, and the fuselage flew out of a graceful and elegant arc to the right, recovering a horizontal attitude.

"How do you feel?" Yang Xiaolong exhaled, and when the fuselage returned to normal, the tense strings in his heart relaxed, and asked.

Stall tailspin, even many old pilots are a little stunned, even Yang Xiaolong is no exception.

This subject is really about touching the edge of death.

In less than ten seconds, from entering the stall tailspin to changing out, the L-15C Falcon fell from a height of 14,000 meters to a height of 12,980 meters.

Zhou Hai's voice was the same, unchanged, relaxed and indifferent: "Fortunately, as long as you stay calm and handle it correctly, you can change the stall tail spin with a high probability." ”

"Don't forget, there's also the height! The stall tail spin may exist at any height, from 10,000 meters to 5 thousand meters, with a nose-down change rate of 90% and a tail-down change rate of 40%. ”

Yang Xiaolong took a deep breath, his words were serious and serious, and he admonished: "One thousand meters to five thousand meters, the two are 40% to 10%, below 1000 meters, the change rate is only 1%, if there are no people and cities on the ground, immediately parachute, we must not hesitate, we are not afraid of falling the plane, we are afraid of saving my life." ”

Height!

This is the most important basis for the stall tail spin to change, if you enter the stall tail spin at a thousand meters, the reaction time is only ten seconds, the nose down has a 1% change rate, the tail change out is almost impossible, must be ejected immediately to escape.

"Okay." Hearing this, Zhou Hai nodded in response.

Yang Xiaolong took a deep breath and arranged: "The control is given to you, the stall angle of attack limit has been lifted, we will carry out the nose down change training, for the sake of safety, climb back to 14,000 meters, remember what I said - stay calm." ”

The words fell, and the control of the body was handed over to Zhou Hai.

Holding the lever again, Zhou Hai exhaled a breath, clearing the slightest nervousness gushing out of his heart, his eyes were bright, his spirit was highly concentrated, and he pulled the lever up and maintained a normal climbing posture.

When the entire L-15C Falcon returns to an altitude of 14,000 meters in a slow manner, the speed is reduced to 350 kilometers, and the silver-gray rounded nose is raised high, like an eagle looking at the world, and the fuselage is sideways to the left.

"Drop!"

In less than a second, a rapid sound resounded in the cockpit, and the tip of the left wing was the first to stall, creating a domino effect that quickly spread to the aileron and flaps.

The left wing stalled, the fuselage lost its balance, and Zhou Hai pressed the lever homeopathically, causing the nose to tilt down to the left, and the entire L-15C Falcon re-entered the deadly and dangerous stall tail spin flight state.

Revolve!

It rotates at a rate of two revolutions per second, and the speed of rotation continues to increase.

The speed is 50 kilometers per hour, and the descent rate is 103 meters per second.

Standing on the seat, Zhou Hai's eyes easily captured the picture of high-speed rotation, dexterous and powerful hands carried out a series of operations, the throttle valve was reset to zero, the pressure lever was forward, the nose was facing down, and the right foot was full of rudder.

Calm and swift.

The rounded and sharp nose is aimed at the vast land below, and the body in a state of loss of control presents a free-fall motion that is expressed by the laws of physics.

One second, two seconds, three seconds!

The dive speed increases rapidly from slow to fast, the thin air blows the swept mid-wing, the flaperon system regains aerodynamic efficiency, and the rudder resumes its function immediately afterward, slowing down the rotation rapidly.

Sensing that the body was back in a controllable state, Zhou Hai did not hesitate, and changed the lever smoothly, pushed the throttle valve up, and supplied oil to obtain power.

"Boom!"

The L-15C Falcon, which was on the verge of life and death, flew out flat, hissing like an eagle accompanied by the roar of the engine, and the tail nozzle dragged out two slender white wake clouds, all showing an elegant and proud posture.

"Very good, Zhou Hai, you are really a good piece of material." After the fuselage was flattened and flew out, a bright smile appeared on Yang Xiaolong's face, and he did not hesitate to praise himself.

Outstanding!

To be honest, Yang Xiaolong didn't expect that Zhou Hai would succeed in changing the subject at a high-altitude stall tailspin, and the whole process was standard, without the slightest rustiness and pause, just like an old pilot.

Panicked and blindly operated, the performance that these flight students should have never appeared on Zhou Hai at all.

"No, I was a little nervous just now." Hearing Yang Xiaolong's praise, Zhou Hai smiled, and the tension in his heart disappeared and returned to calm.

Steady?

That's pretended, it's a fool to say that you're not afraid, you know, this is the famous high-altitude stall tailspin.

Fortunately, it was a success, and Zhou Hai accumulated valuable experience.

"Nervousness is nothing, as long as it is stable, every time I do a high-altitude stall tailspin, I am just as nervous, and I performed very well today." Yang Xiaolong smiled, and his words revealed a hint of exhaustion: "Okay, that's the end of today's training, let's go back." ”

"Instructor Yang, don't you practice the level and tail?" When Zhou Hai heard this, he wondered.

"Level and tail after the practice, the meal to eat one bite at a time, by the way, Lei Deputy, arrange a new task, and then go to learn to drive with the ground crew leader." Yang Xiaolong exhaled and replied.

"Learning to drive?" Hearing Yang Xiaolong's words, Zhou Hai was puzzled in his heart: "That, aren't we forbidden to drive?" ”

In everyday life, pilots and pilots are forbidden to drive, but this is a separate discipline.

"It's true that you don't want to drive, but you have to master the skills of driving and know how to drive so that you don't get blind in an emergency." Yang Xiaolong said with a smile: "I forgot to say, bicycles, motorcycles and cars must be learned, and they must also pass the assessment, but if you don't have a driver's license, you can return home." ”

"Okay." Zhou Hai was slightly helpless, responded, subconsciously pulled the lever and stepped on the rudder, and easily controlled the fighter to turn around and return home.

Learning to drive?

For Zhou Hai, who has been flying planes, it is a new thing, although this situation of learning to drive but not issuing a driver's license is a bit of a pitfall.

Yang Xiaolong is right, it is true that flying officers are strictly forbidden to drive, but you must master this skill so that you will not be caught blind in the event of war and other emergencies.

Considering this situation, it doesn't seem to matter if you have a driver's license or not.

Turning back, the two S-17 turbofan engines maintained a small thrust state, and the agile and light L-15C Falcon bathed in the sun, the nose of the plane was like a sword, revealing a sharp momentum, and swept towards the stone city at cruising speed.