The silver-gray L-15C falcon dragged its slender pointed majesty, like an eagle, revealing a fierce momentum, and swept head-on towards the higher sky.

5,000 meters!

Seven thousand meters!

10,000 meters!

After shuttling through the thin layer of high-altitude cumulus clouds, two slender and long-lasting wake clouds hung on the tail of the aircraft, and the whole warhawk climbed to an altitude of 10,000 meters in the eternal blue sky.

The air is thin and only a few people in the world set foot here, and they are entitled to enjoy the beautiful scenery that will never get tired of it.

As the altitude grew, the air became thinner, the power output of the two S-17 turbofan engines gradually decreased, and the nimble and light L-15C Falcon gradually became like a slow snail, with maneuverability and climbing efficiency declining linearly.

12,000 kilometers.

13,000 kilometers.

After more than ten seconds, the clumsy and slow L-15C Falcon climbed to a predetermined altitude, and the forward pressure of the nose changed its angle of attack, and it smoothly changed to fly.

"Now put the rod, according to the falling posture, the tail spin is generally divided into three kinds, the tail is down, the fuselage is horizontal, and the nose is down, of which the nose tail spin is the easiest to change, and the fuselage horizontal tail spin is the second most difficult, and the level needs to be changed to the nose tail spin, and the tail tail is the most dangerous and difficult to control."

After climbing to a predetermined altitude, Yang Xiaolong took over the control of the airframe and carefully explained the situation of tailspin to Zhou Hai through the radio communicator: "The reason why the aircraft has different tailspin attitudes is related to the action and center of gravity distribution before the stall. ”

"Hmm."

Zhou Hai listened quietly, and Yang Xiaolong's explanation included not only the aviation theoretical knowledge that he had already known, but also the precious personal flight experience.

Stall tail spin out - this training subject full of extreme danger must be treated with caution, and Zhou Hai will not take it lightly.

"Zhou Hai, the most important point in dealing with stall tailspin, calm down, calm down! After the aircraft enters the stall tailspin state, you must not panic and avoid blind operation. ”

Yang Xiaolong held the joystick steadily, maintained the horizontal attitude of the fuselage, and emphasized: "Last year, when a Mountain Eagle higher education was training to change the tail spin of the high-altitude stall, because the students were too nervous and panicked, they pulled the lever indiscriminately, causing the nose to turn into a tail-down attitude, and encountered the influence of high-altitude turbulence, and finally could not change it, only catapult and parachute, wasting a valuable fighter and resources of the country. ”

"What about the students and instructors?" When Zhou Hai heard this, his heart sank, and he asked softly.

"The two of them are safe, nothing serious. Time is the most important thing to deal with tailspin, at an altitude of 14,000 kilometers, we have about 140 seconds, in the nose tailspin state, we have to reset the throttle to zero, let the engine in a slow 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 tail spin: "At this time, quickly judge the direction of tail spin, assuming that it rotates around the vertical axis to the right, we need to step on the left rudder with the opposite direction of rotation, and then slow down or eliminate the rotation. ”

"Remembered."

After listening to Yang Xiaolong's careful explanation, Zhou Hai had a basic concept of the operation steps and process of stall tailspin, took a deep breath, and responded.

Complex!

It's really complicated!

The high-altitude stall tail spin is worthy of being the most difficult flight subject to learn in the stage of higher education aircraft.

The aircraft enters the stall tailspin, which is from the normal flight attitude to an unstable spin state, rotating around the vertical axis, because the air separation is in disorderly turbulence, and there is no fixed control law, so that the aerodynamic control surface is all invalid, can not play its own efficiency.

The easiest nose-down tailspin requires a series of complex and fast maneuvers and reactions, not to mention the fuselage horizontal and tail-down tailspin.

"Remember, you must not panic, and you can't make a mistake in judging the direction of the tailspin, and the two more difficult tailspins, horizontal and downward, need to be converted to a head-down position."

Yang Xiaolong's voice was steady, and he said slowly: "The core idea of dealing with tail spin - do the opposite, use altitude to exchange speed and restore control, and then I will show you the change of nose and tail spin." ”

When the words fell, the right-hand lever stepped on the rudder, unblocked the restriction of the angle of attack by the airborne avionics, and operated.

The L-15C Falcon, flying at an altitude of 14,000 meters in a horizontal attitude, quickly reduced its speed, from 800 kilometers per hour to 350 kilometers per hour, and then the slender and rounded nose quickly rose up, and the fuselage was in a lateral left attitude.

"Drop!"

Suddenly, a rapid alarm sounded in the teardrop-shaped glass cockpit, and the display on the left side flashed a striking yellow screen, giving a hint that the angle of attack of the fuselage was about to be exceeded.

Yang Xiaolong was indifferent, calm, continued to pull the rod back, stepped on the rudder with his left foot, and after less than a second, the left wing of the fuselage exceeded the maximum angle of attack limit, the wingtip edge bar entered a stall state, the airflow separation was disordered, and the two aerodynamic rudder surfaces of the left wing flaperon system failed.

"Drop!"

The display on the left side flashes red, the alarm sound in the cabin is extremely fast, at the highest frequency, and the flight parameters show a stall prompt.

The left wing stalled, the fuselage deviated laterally to the left, the fuselage lost balance in an instant, the right wing and flaperon system and horizontal rudder failed, and the nose tilted downward to the left and rotated around the vertical axis.

In the cockpit, the surrounding scenery is swirling and blurry, the picture is as dazzling as a kaleidoscope, the alarm sounds non-stop, and the real airspeed of the fuselage is rapidly decreasing like an open sluice, falling at a height of 102 meters per second.

Stall!

Revolve!

This is the stall tail spin that countless people in the aviation field talk about, and the nightmare of every student of the higher education aircraft.

"High-speed spinning and overloading cause a lot of psychological pressure on people, and it's really difficult."

Zhou Hai, who sat smoothly on the ejection seat, did not show anything, his face was the same as before, calm and indifferent, his eyes observed the outside world through the cockpit glass, and then looked at the flight parameters and gave an evaluation.

The speed is as slow as 55 kilometers, the average drop altitude 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 and hesitate, collected the oil pressure rod at the fastest speed, filled the rudder with his right foot, operated according to the correct steps, and maintained the attitude of accelerating and diving with the nose facing down.

Although the important aerodynamic rudder surfaces of the wings, flaperons and rudder fail, as long as the downdive accelerates, the altitude is exchanged for speed, and the correct direction and angle of attack are maintained, the wing can eventually regain the pressure difference, provide lift, and then change the flight state of stall tailspin.

One second,

Two seconds,

Three seconds!