"006, report data." There was a sound coming from inside the headphones.

Now that it has left the factory, the test flight is about to kick off, and it is not easy to fly an airplane.

If subdivided, this kind of ground sliding, can be divided into low-speed sliding, medium-speed sliding and high-speed sliding, the speed is faster than one time, and when the last high-speed sliding run, you have to try to pull up the steering rod to see if the nose can pry up, although in the design, these data are not known to have been calculated many times, but no matter how the design, it is all theory, from theory to practice, there is a big gap, which requires test pilots to fly.

The first thing to do is to run at low speeds.

Hearing the sound from the headphones, Qin Feng's feet stepped on the pedal, feeling the whistling of the two engines behind him, compared with the previous turbojet engine, the sound of this turbofan engine is softer, not so sharp, but more full of power, this is caused by different working principles, the two engines in the tail have been ignited, and now they are ready to go!

"006 received, engine oil pressure 1.6, speed 2000, all instruments are displayed normally, request for coasting experiments."

"Yes, let's start gliding." When he heard the sound, Qin Feng released the brakes, and under the impetus of the engine in the tail, the J-7 fighter relied on its own power for the first time and slid forward!

Qin Feng didn't notice his meter, how fast he was taxiing, he could compare it by looking at things outside, what he needed most was to see if the front was aligned with the center line of the runway.

Low-speed gliding, mainly to see whether the aircraft has deviation, in the design, the aircraft must be symmetrical, but in the manufacturing, if the torque on both sides is different, such as the thrust of the engine is different, the braking performance of the tires on both sides is different, etc., may cause the aircraft to deviate, if this situation is encountered, then it is necessary to spend time to find the reason, and then solve it, otherwise, the take-off deviation is good to say, the landing deviation is really hopeless.

He watched as he aligned himself with the center line of the runway, moving forward, the scenery on both sides was constantly retreating, and then, the voice of his companion behind him came: "The speed has been reached!" ”

Qin Feng turned off the engine, relying on inertia, the fighter continued to slide forward, and at the end of the runway, Qin Feng even operated the fighter and directly made a turn.

No problem!

This plane is not a heavy aircraft, but it is supported by two wheels on both sides, and it is very stable.

The people on the ground cheered.

Qin Feng's first test flight only lasted five minutes, and after he slid back, he began to measure various data, and the engineers were busy.

"Qin Feng, how do you feel?" Chen Lao was under the gangway, watched Qin Feng come down, and said with a smile.

"Yes, this plane, it's like riding on a tall horse, the previous plane, well, it was a little donkey." Qin Feng used an analogy, this plane is very tall.

Chen Lao smiled: "Yes, if you want to tame this fierce horse, you still need excellent test pilots, today is very smooth, but this is only the first step of the long march, in the future, we still have a lot of test flight work to do." ”

Before this plane, one of the projects in China that went through the complete process was Jian-8, this aircraft Qin Feng also participated in the test flight, knowing that many of the small problems may bother you for a long, long time, now, it is really just the first step of the long march.

"No matter how many problems there are, I believe that we will be able to overcome them." Qin Feng said.

The first test flight inspired everyone, and in the past few days, several gliding experiments were carried out every day, and soon, the low-speed taxi, the medium-speed taxi, were over, and finally the high-speed taxiing was left.

Taxiing at high speed is to accelerate the plane to a speed of about 200 knots, and then pull the operating lever to make the nose of the fighter lift, continue to fly forward for a while, and then turn off the engine to come down, if you continue to refuel, the plane will get up.

This is also the last hurdle before the first flight.

"Fortunately, our runway is long enough, if it is Factory 132, I am afraid it will not be possible to experiment at all." Qin Feng looked at the long runway here and said with a sigh.

Factory 132 has always produced fighter jets, and its runway, as long as the J-7 can fly, so the runway is only more than 1,000 meters, and what about this side? The main thing here is to make the H-6 bomber, which has a long enough runway to fly, so the factory runway here is almost three thousand meters long!

Let the fighter pull up the nose, if it flies directly, forget it, but now it is not to fly, but to slow down to stop, if the runway is not long enough, then it will not be able to stop safely, after all, the current aircraft still uses the most ordinary brake pads, if Qin Feng brakes directly like flying the Phantom 2000, the brake pads below will definitely catch fire.

The length of the runway is enough, then everything will be solved, at this time Qin Feng just said casually, he absolutely didn't know, ten years later, when they started to test fly the J-10, the problem that the runway was not long enough troubled them for a long, long time.

Carrying his helmet, Qin Feng got on the plane, skillfully completed the preparations, and then began to slide forward.

This time, he turned on the afterburner.

Both low-speed and medium-speed sliding only require military thrust, but if you want to run at high speeds, in order to shorten the distance of the sliding as much as possible, turning on afterburner is obviously the most appropriate, no matter how long the runway is.

The afterburner thrust of the Spey engine reached 9 tons, and the two engines started together with afterburner, which is 18 tons of thrust! And now the J-7, the total mass is less than 16 tons, so, theoretically, the thrust-to-weight ratio is more than 1, the acceleration should be quite rapid, don't look at it as a bomber, if you need to, you can still fight with fighters! Of course, it has to be in the hands of highly skilled pilots.

With such an idea, I let go of the pedals under my feet, and sure enough, a long-lost feeling of pushing my back appeared!

What would it feel like if these two Speys were installed behind J-8's ass?

Of course not, the J-8 is a high-altitude and high-speed fighter, and with this engine, it can't fly fast. Besides, there is a lot of difference in diameter, and it is not easy to stuff it in.

This thought flashed by, and the J-7 had already rushed forward rapidly!