The silver-gray L-15C falcon drags its slender pointed majesty, like an eagle, showing its fierce momentum, and flies higher into the sky.
Five thousand meters!
Seven thousand meters!
Ten thousand meters!
After passing through the thin layer of high-altitude cumulus clouds, two long and long trail clouds hung on the tail of the aircraft, and the entire War Eagle climbed to an altitude of 10,000 meters, which is always blue.
The air here is thin, and only a few people in the world have set foot there, and they are qualified to enjoy the stunning scenery that they will never tire of.
As the altitude continues to increase, the air becomes thinner, and the power output of the two WS-17 turbofan engines gradually decreases. The flexible and lightweight L-15C Falcon gradually becomes like a slow snail, with its maneuverability and climbing efficiency showing a linear downward trend. .
Twelve thousand meters.
Thirteen thousand meters.
Ten seconds later, the clumsy and slow L-15C Falcon climbed to the predetermined height. The nose of the aircraft was pressed forward to change its angle of attack, and it recovered from flight smoothly.
"Now put the stick down, and according to the falling posture, tail spin is generally divided into three types: tail down, fuselage horizontal, and nose down. Among them, nose spin is the easiest to correct, and fuselage horizontal tail spin is the second most difficult. It requires Change the level to a nose-down spin, which is the most dangerous and difficult to control."
After climbing to the predetermined altitude, Yang Xiaolong took over the control of the aircraft and explained the spin situation to Zhou Hai in detail through the radio communicator: "The reason why the aircraft has different spin postures is related to the movement and center of gravity distribution before stalling. Relevantly, a stall does not necessarily mean a tail spin, and a tail spin must be in a stalled state."
"Um."
Zhou Hai listened quietly, and Yang Xiaolong's explanation included not only familiar aviation theoretical knowledge, but also precious personal flying experience.
Stall spin recovery—this training subject is full of extremely high risks and must be treated with caution, and Zhou Hai will not take it lightly.
"Zhou Hai, the most important thing when dealing with stall and spin is to be calm, calm! After the aircraft enters the stall and spin state, you must not be in a hurry and panic, and avoid blind operations."
Yang Xiaolong held the joystick steadily, keeping the fuselage in a horizontal posture, and emphasized: "Last year, when a Shanying Higher Education School was training to recover from a stall and tail spin at high altitude, the students were too nervous and panicked, and pulled the lever randomly, causing the nose of the aircraft to fall down. It changed to a tail-down attitude and encountered the influence of high-altitude turbulence. In the end, it was impossible to recover and the only option was to eject and parachute, which was a waste of the country's precious fighter aircraft and resources."
"Where are the students and teachers?" Zhou Hai's heart sank when he heard these words, and asked softly.
"Both people are safe, nothing serious. When dealing with spin, time is of the utmost importance. At an altitude of 14,000 meters, we have about 140 seconds. When the nose of the aircraft is spinning, we need to return the throttle to zero and let the engine In the idle state, press the lever forward and maintain the dive control lever position."
Yang Xiaolong's voice was calm and powerful, and he slowly and carefully explained the relevant steps and content of dealing with spin: "At this time, quickly determine the direction of the spin. Assuming that it is rotating to the right around the vertical axis, we need to fully step on the left rudder in the opposite direction of rotation, and then Slow down or eliminate the rotation. At this time, the attitude of the aircraft is stable, the aerodynamic control surface resumes its function, and it accelerates downward smoothly, and the flight can be recovered. Remember?"
"remember."
After listening to Yang Xiaolong's detailed explanation, Zhou Hai already had a basic concept of the operational steps and process of stall and spin recovery. He took a deep breath and responded.
complex!
It’s really complicated!
High-altitude stall tail spin recovery is indeed the most difficult flight subject to learn in the higher education aircraft stage.
When the aircraft enters a stall tail spin, it changes from a normal flight attitude to an unstable spin state, rotating around the vertical axis. Due to the disordered turbulence of air separation and the absence of fixed control rules, all aerodynamic control surfaces fail. Unable to exert its own effectiveness.
Just the easiest way to recover from a nose-down tailspin requires a series of complex and fast operations and reactions, let alone two types of tailspins: horizontal fuselage and tail-down.
"Remember, you must not panic, and you must not make mistakes in judging the direction of the spin. The two more difficult spins, horizontal and downward, need to be converted into a nose-down position."
Yang Xiaolong's voice was steady and he said slowly: "The core idea of dealing with tail spin is to do the opposite, use height to exchange speed and restore control. Next, I will show you how to recover the nose spin."
After finishing speaking, he pulled the lever with his right hand and stepped on the rudder to unlock the airborne avionics' restriction on the angle of attack and proceed with the operation.
The L-15C Falcon, flying in a horizontal attitude at an altitude of 14,000 meters, quickly reduced its speed, from 800 kilometers per hour to 350 kilometers per hour. Then its slender and round nose quickly tilted up, and its fuselage was tilted laterally to the left. attitude.
"drop!"
In an instant, a rapid warning sounded in the drop-shaped glass cockpit, and the left monitor flashed an eye-catching yellow screen, giving a reminder that the fuselage's angle of attack was about to be exceeded.
Yang Xiaolong remained calm and unhurried, and continued to pull the stick back and step on the rudder with his left foot. Less than a second later, the left wing of the fuselage exceeded the maximum angle of attack limit, the wingtip edge entered a stall state, and the airflow separation became turbulent. , two aerodynamic rudder surfaces of the left wing flaperon system failed.
"drop!"
The display on the left flashes red, the cabin alarm sounds extremely fast, at the highest frequency, and the flight parameters display a stall prompt.
The left wing stalled, and the fuselage tilted laterally to the left. In an instant, the fuselage lost balance. The right wing, flaperon system, and horizontal rudder failed, and the nose of the aircraft tilted downward and to the left and rotated around the vertical axis.
In the cockpit, the surrounding scenery was spinning and blurred. The picture was as dazzling as a kaleidoscope. The alarms kept ringing. The real airspeed of the fuselage decreased rapidly like an open floodgate, falling to a height of 102 meters per second.
Stall!
Spin!
This is the stall tail spin that makes countless people in the aviation field change their minds and is the nightmare of every higher education aircraft student.
"High-speed rotation and overload cause a lot of psychological pressure on people, which is really difficult."
Zhou Hai, who was sitting steadily on the ejection seat, didn't show much. His face was as calm and calm as before. He observed the outside world through the cockpit glass, looked at the flight parameters, and made an evaluation.
The speed is as slow as 55 kilometers, the average drop height is 100 meters, the cabin is spinning, and the flight overload acts on the body all the time, making it difficult to judge and adapt.
At this time, Yang Xiaolong, who did not dare to delay or hesitate, retracted the hydraulic lever as quickly as possible, put his right foot on the rudder, followed the correct steps, and kept the nose of the aircraft in an accelerated dive.
Even though the important aerodynamic surfaces of the wing, flaperon and rudder have failed, as long as the aircraft dives downward and accelerates, trades height for speed, and maintains the correct direction and angle of attack, the pressure difference on the wing will eventually be restored, providing lift, thereby improving the performance of the wing. Out of stall and spin flight conditions.
one second,
two seconds,
Three seconds!
