The taxiing of the aircraft is divided into three parts, low-speed taxi, medium-speed taxiing and high-speed taxiing, three taxiing, the determined state is different, low-speed taxiing, mainly to verify whether the aircraft is flexible, U-turn on the field, steering and the like, while medium-speed taxiing, verifying whether the aircraft deviates, whether the aerodynamic layout is symmetrical, etc., and high-speed taxiing, verifying another problem, that is, whether the aircraft can fly.

That's right, this question sounds unnecessary, can't fly, is it still called an airplane? It may seem like something you don't need to think about at all, but in reality, it's a big problem.

After all, at the time of design, the wind tunnel has been blown countless times, and the lift characteristics of the aircraft have been determined, but in fact, whether this lift characteristics are consistent with the actual situation, no one knows, it must be obtained in high-speed taxiing, after the speed exceeds 100, the lift of the wings of the aircraft is already very large, at this time, it is necessary to verify whether it can fly in taxiing.

If you want to fly, don't you fly? Of course this is not the case, before the plane flies, first pull the front wheels, let the front wheels up, and then continue to accelerate and fly a certain distance before the rear wheels can get up, so that the plane flies.

The current high-speed taxiing is the process in the middle, taxiing to a predetermined speed after pulling the rod, according to the plan, at this time the aerodynamic force of the aircraft should be able to lift the front wheels. If the plane can't be lifted, then there is something wrong with the design of the plane, and then push the rod again, and the nose wheels of the plane return to the ground.

Although it did not fly completely, just lift the front wheel, and then put the front wheel, which has also begun to use the lift of the aircraft, at this time it can be determined whether the aerodynamic force of the aircraft is consistent with the design value, and this aerodynamic parameter can be compared with the wind tunnel blowing data to see if it is the same as the wind tunnel test flight, and the calculation model can be corrected.

If you say that you can fly directly, this runway is indeed long enough, but now, don't fly, but first accelerate and then slow down, Chengdu's runway is only 2,500 meters, which is not enough.

In the past, I really haven't encountered this kind of problem, after all, the previous J-6, J-7, are all designed, no need to verify whether it can be lifted, just fly directly, up to now, the only such test flight, that is, the Flying Leopard fighter-bomber, the Flying Leopard is flying in the west, people's factories also produce the H-6, the runway is very long, so there is no problem.

Now in Chengdu, there are not enough runways, this runway, according to the plan, is at least four kilometers enough!

"It's impossible for us to continue building the runway." Song Lao looked at the outside of the base, on the other side of the runway, it was already the road, and it was impossible to extend the runway.

What should I do if I don't extend the runway?

"The only thing that can meet our requirements is the test flight institute." Zhou Lao, the chief pilot of the test pilot, said: "So, I suggest that we take it to the test flight institute to do it." ”

Go to the test flight institute? It's easy to say, but it's actually very difficult, and the most basic question is, how do you get there?

In the past, all kinds of planes went to the test flight institute to fly, that is, they had already flown the basic actions in advance, so it was enough to fly to the test flight institute, but now the J-10 has not yet completed the glide test, and it is impossible to fly to the test flight institute, if it can fly, then there is no need to worry about the current high-speed gliding problem.

"Disassemble, reassemble?" Song Lao shook his head: "No, this is not good!" ”

If you can't fly, then you can only transport it by road, road transportation, at least remove the wings on both sides, in order to assemble this aircraft, how many employees worked day and night in the closed workshop, overcame one problem after another, and finally came out, and then, because of the debris problem when assembling, it was delayed for so long, and now, if it is disassembled and reinstalled, maybe there will be new problems, so, Song Lao will never agree!

"However, without this aerodynamic parameter, there is no way to go back to simulate, there is no way to simulate take-off and landing, and safety cannot be guaranteed!" Zhou Lao said: "Now if you want to complete the first flight, you must solve the problem of high-speed running as soon as possible, our first flight date has been postponed once, and it cannot be postponed again!" ”

Originally, it was planned to make the first flight in 97, but, because of the deviation problem of the medium-speed sliding run, it dragged on for several months, and now, it has finally been solved, and there is only one high-speed sliding run left, and the time has entered 98 years.

Many people are waiting to see the joke, even now, there are still many people who want to stop the J-10 project and buy a few more Su-27s.

"Old Zhou, Old Song." Qin Feng spoke: "We might as well do this, let's conduct a test flight first, when we slow down, the runway is not enough, we can continue to use the old method, as long as we use our brains, there must be a way to solve it, let's try a few more times, how?" ”

Now the problem is that the runway is not long enough, accelerate, pull up the nose, and then slow down, so that the runway is not enough, then force deceleration, take out the previous way, at that time, even without braking, the J-10 fighter can be stopped, why can't it now?

Qin Feng's opinion is very simple, let's try it first!

"Okay, give it a try." Song Lao said: "The aerodynamic layout of our aircraft is very advanced, according to the design indicators, at 100 kilometers per hour, the nose can be pulled up." ”

Whether the aircraft is advanced or not, just look at this indicator, how high the speed can pull up the nose, J-7, J-8, if there is no 200 kilometers per hour, you can think about it, when the J-10 has 100 kilometers per hour, it can already be pulled up, this is the world of difference! The mobility of the J-10, that is the most powerful.

This is caused by many reasons, the lift coefficient of the third-generation aircraft is already large, the large delta wing of the J-10 plus the leading edge of the maneuvering flap, also has this benefit, more importantly, there is also the J-10 is relying on the canard, the initiative to lift the nose up, is the positive lift, what about ordinary aircraft, the tail is in the back, it is forced to press the tail down, pry up the nose, therefore, the J-10 is easy to look up, another common name for the canard layout, it is called the head-up layout.

If you can pull it up at 100 km/h, the problem is solved.

Try it first, it really doesn't work, and then think of another way.

"Yes, we can only do this first, we will brainstorm and strive to fly the Jian-10 as soon as possible." Song Lao agreed.

A few days later, the high-speed run began.