The world's first fighter to use a double vertical tail arrangement is the MiG-25, at that time because this is a high-altitude high-speed fighter, able to fly to an altitude of 30,000 meters, where the air is too thin, in order to prevent the torque of the rudder surface is not enough, so the designers of Mikoyan set it up with a double vertical tail, two vertical tails, just plugged into the top of the two engines, this design scheme, immediately inspired other designers.

The follow-up heavy fighters of the United States, F-14 and F-15, all use the design method of double vertical tails, and just a few years ago, the Su-27 fighter can use the vertical tail as an air scalpel to cut the engine of the American reconnaissance aircraft, and it is also because they have a double vertical tail, so even if there is a problem with one of the vertical tails, it will not have much impact, and it can still be controlled normally.

If you want to pursue advanced, the J-7 can also be designed in the form of a double vertical tail, but it does not, this aircraft is quite conservative when designed, from the structure of the wing knife it still retains, it can be seen that it also directly set up a tall single vertical tail in the back, and the tail has a large area of rudders.

Now, I don't know what the situation is for the time being, but in short, now the rudder must have fallen off, the rudder surface is gone, and the steering role has been lost!

The whole vertical tail, the front is fixed, so that the stability of the course can be maintained, the rudder surface behind can be rotated, when it turns to the left, it will let the airflow push it to the right, the tail to the right, the nose will naturally go to the left, which completes the steering.

Of course, this is not enough, although the fuselage has changed direction, but the overall course of the aircraft will not change, at this time, the fuselage needs to be tilted, so that the wing will be tilted, the inclined wing, the lift is no longer balanced with gravity, and the centripetal force of a side is synthesized, and it is this force that makes the aircraft turn.

Therefore, when the fighter wants to turn, the accurate expression is to pull the rod and push the rudder, turn to the left, then the operating stick will push to the left, and the left wing will deviate downward, and cooperate with the rotation of the rudder surface of the tail, then a turn will be completed.

Now, the rudder is gone, which means that the fighter has lost the ability to control the course, unless the fighter can face the airfield in the air, and there is no interference from the crosswind, so that it can fall behind, otherwise, it will be impossible to come back!

When Qin Feng's report came down, everyone in the tower of the base stood up.

The test flight institute is responsible for the test flight of the new aircraft, and in the test flight, all kinds of situations may occur, but it is really the first time that the rudder of this kind of aircraft flies off!

In an instant, everyone became nervous, and now, the rudder has fallen, and what about the plane, can it still be controlled? Even if it can be controlled, how can it be guaranteed to fly back safely?

"083, report the aircraft." The commander sent out an inquiry.

"The aircraft is generally stable." Qin Feng replied: "I can control it with other rudder surfaces, and now, I am turning, aiming at the airport." ”

Of course Qin Feng will not admit defeat like this, as long as there is a possibility of one point, Qin Feng will do his best to make a hundred efforts, he will fly the fighter back!

For the test pilots, this is an unshirkable responsibility, and only when they fly back can the technicians find out where the problem lies, and how to strengthen it, so as to prevent a similar situation from occurring again, if the plane falls, the failure will recur, and there will be other comrades who will take risks.

If there was no load, then Qin Feng could actually try to make a forced landing in the field, but now, there are four anti-ship missiles mounted under the wings, which add up to more than two tons, such a big guy, when he makes a forced landing, he will definitely tear off the wings!

Only a flat runway can ensure absolute safety, so it is incumbent on Qin Feng to fly the fighter plane back.

So, how do you do it?

The force of the rudder is to provide a sideways offset force, thereby changing the direction of the nose, and now, although the rudder is gone, he has two engines!

Using two engines to provide different thrust, this kind of action can be completed, this theory was put forward by Qin Feng during the air refueling test flight of the J-82 fighter, in order to overcome the lateral turbulence, he proposed such a theory, and then during the test flight, it was also verified.

This time, let's experiment on the J-7!

Single-engine aircraft, there is only one throttle stick, and double-engine aircraft, the throttle stick is linked, usually, the two throttle sticks are locked together, when operating, the two engines react together, and when it needs to be changed, it can also be separated, just like now, the left engine is in the state of slow driving, and the engine on the right is the maximum military thrust state, so that the nose can be deviated to the left, and then, Qin Feng gradually took the operating lever and pressed the operating stick slightly to the left, in the sky, An arc with a radius of several tens of kilometers was drawn, and this time the turn was quite slow.

Airplanes are difficult to adjust. After all, this is different from the rudder surface, the rudder is directly controlled, and although the thrust difference between the two engines is large, the thrust is backward and becomes a sideways change, which is so slow.

On the radar display on the ground, it is almost impossible to see that it is turning, only the data transmitted by the data recorder on the plane shows that the plane is turning.

Later, the test flight institute spent a high price and imported a set of Daming system, which can transmit all kinds of data on the fighter in real time, which greatly facilitates the test flight work. It also helps a lot.

"He can steer, but the steering force is too weak, so he has to be absolutely aimed at the runway this time back." Someone shouted.

To complete a turn, it takes a radius of dozens of kilometers, in this case, if he does not aim at the runway and return to flight, it will be very far to go around in a circle, and the test pilot inside has undergone too many tests, and a failed landing may make his psychological pressure even greater.

It must be aligned, the fighter plane is coming down at a speed of several hundred kilometers, and if there is a slight deviation, it will definitely rush out of the runway, and this plane also carries four missiles, once it rushes out, the consequences are unimaginable!