In an instant, after the L-15C Falcon fell to a height of about 700 to 800 meters, as the fuselage accelerated in a dive, the high-speed airflow crossed the surface of the wings, and the pressure difference between the left and right wings regained a certain degree, and the body transformed from an out-of-control state to Semi-out of control state, the rotation state slows down.
After another second, as the speed increased to 200 per hour, the airflow returned to regularity, the flaperon system and rudder restored aerodynamic efficiency, the body returned to a controllable state, and the rotation state was eliminated.
"Buzz!"
The scream of the engine spread across the sky. Yang Xiaolong gently pulled the lever, stepped on the rudder with his right foot, and the fuselage flew to the right in a beautiful and elegant arc, returning to a horizontal attitude.
"How do you feel?" Yang Xiaolong exhaled and asked after waiting for the fuselage to return to normal and the tight strings in his heart to relax.
Stall and spin, even many veteran pilots are a little frightened, even Yang Xiaolong is no exception.
This subject is the true meaning of contact with the edge of death.
In less than ten seconds, from entering the stall spin to recovering, the L-15C Falcon fell from an altitude of 14,000 meters to an altitude of 12,980 meters.
Zhou Hai's voice remained unchanged, relaxed and indifferent: "Fortunately, as long as you stay calm and handle it correctly, you can recover from the stall spin with a high probability."
"Don't forget, there is also height! Stall spin may exist at any height, from 10,000 meters to 5,000 meters. The recovery rate is 90% with the nose down and 40% with the tail down."
Yang Xiaolong took a deep breath, spoke seriously and solemnly, and warned: "From one thousand meters to five thousand meters, the recovery rate is 40% to 10%. Below 1,000 meters, the recovery rate is only 1%. If there are no masses and cities on the ground, Skydive immediately without hesitation. We are not afraid of crashing the plane, but we are afraid of saving my life."
high!
This is the most important basis for recovering from a stall and tail spin. If a stall and tail spin is entered at 1,000 meters, the reaction time is only ten seconds. With the nose down, there is a 1% recovery rate. Recovery with the tail is almost impossible and must be done immediately. Ejection escape.
"Okay." After hearing these words, Zhou Hai nodded in response.
Yang Xiaolong took a deep breath and arranged: "The control is given to you. The stall angle of attack restriction has been lifted. We will conduct nose-down recovery training. For safety reasons, we will climb back to 14,000 meters. Remember what I said. of—keep calm.”
After finishing speaking, he handed control of the body to Zhou Hai.
Holding the joystick again, Zhou Hai exhaled to clear away the slightest tension in his heart. With bright eyes and high concentration, he pulled the lever and raised his head, maintaining a normal climbing posture.
After the entire L-15C Falcon returned to an altitude of 14,000 meters in a slow manner, the speed was reduced to 350 kilometers, the silver-gray round nose was raised high, like an eagle looking down at the world, and the fuselage turned sideways to the left.
"drop!"
In less than a second, an extremely urgent sound sounded in the cockpit again. The left wingtip was the first to enter the stall state, causing a domino effect that quickly affected the ailerons and flaps.
The left wing stalled and the fuselage lost balance. Zhou Hai pressed the lever, causing the nose of the aircraft to tilt downward and to the left. The entire L-15C Falcon re-entered the fatal and dangerous stall and spin flight state.
Spin!
It rotates at a frequency of two revolutions per second, and the rotation speed continues to increase.
The speed is 50 kilometers per hour and the falling rate is 103 meters per second.
Standing on the seat, Zhou Hai's eyes easily captured the scene of high-speed rotation. His dexterous and powerful hands performed a series of operations. The throttle valve was reset to zero, the pressure lever was moved forward to keep the nose down, and his right foot was full on the rudder.
Calm and quick.
The rounded and sharp nose of the machine is pointed at the vast land below. The out-of-control body exhibits free fall motion based on the laws of physics.
One second, two seconds, three seconds!
The dive speed increased rapidly from slow to fast, and the thin air blew the swept center wing. The flaperon system regained its aerodynamic efficiency, and the rudder resumed its function immediately, and the rotation quickly slowed down.
Realizing that the aircraft body was back under control, Zhou Hai did not hesitate, smoothly pulled out the lever, pushed up the throttle valve, and supplied fuel to gain power.
"boom!"
The L-15C Falcon, which had experienced the edge of life and death, leveled out and flew out, accompanied by the roar of the engine, it neighed like an eagle, and the tail nozzle dragged out two slender white trail clouds, showing off its elegant and proud appearance. attitude.
"Very good, Zhou Hai, you are indeed a good material." After the fuselage was leveled and flew out, a bright smile appeared on Yang Xiaolong's face, and he was not stingy in his praise.
excellent!
To be honest, Yang Xiaolong never expected that Zhou Hai would successfully recover from a stall and tail spin at high altitude. The whole process was standard, without any rust or pause, and he was as calm as an old pilot.
Panicked and blindly operating, the behavior that these student pilots should have never appeared in Zhou Hai.
"No, I was still a little nervous just now." After hearing Yang Xiaolong's praise, Zhou Hai smiled, and the nervousness in his heart disappeared and he became calm.
Calm?
That's just an act. Saying you're not afraid is just lying to a fool. You know, this is the famous high-altitude stall spin.
Fortunately, it was a success and Zhou Hai gained valuable experience.
"Nervousness is nothing, as long as you handle it stably. Every time I do a stall spin at high altitude, I am equally nervous. My performance today is very good." Yang Xiaolong smiled, with a hint of exhaustion in his words: "Okay, today The training ends here, let’s return.”
"Teacher Yang, don't you practice leveling and tail training?" Zhou Hai heard this and asked doubtfully.
"We will practice the level and tail section later. We have to eat our food one bite at a time. By the way, Deputy Lei, arrange a new task and learn how to drive with the ground crew leader later." Yang Xiaolong exhaled and replied.
"Learn to drive?" After hearing Yang Xiaolong's words, Zhou Hai was confused: "Um, aren't we prohibited from driving?"
In daily life, student pilots and pilots are prohibited from driving. This is a separate discipline.
"It's true that driving is prohibited, but you have to master the skills of driving and know how to drive so that you won't be blinded in an emergency." Yang Xiaolong said with a smile: "I forgot to mention that you must learn to drive bicycles, motorcycles and cars, and you must also go through Assessment, but no driver’s license is issued to you, please return.”
"Okay." Zhou Hai responded with a slight helplessness, subconsciously pulled the lever and stepped on the rudder, and easily controlled the fighter plane to turn around and return home.
Learning to drive?
For Zhou Hai, who has been flying airplanes, this is a new thing, although this situation of learning to drive but not being issued a driver's license is a bit embarrassing.
What Yang Xiaolong said is true. Flying officers are indeed strictly prohibited from driving, but you must master this skill to avoid being blinded in the event of war or other emergencies.
Considering this situation, it doesn't seem to matter whether you have a driver's license or not.
Turning around and returning, the two WS-17 turbofan engines maintained low thrust. The agile and light L-15C Falcon was bathed in the sun. Its nose was like a sword, exuding a sharp momentum, and it swept towards Shicheng at cruising speed.
