Test pilots, who are also engineers, the methods they provide are more complex with reality, and in the entire test flight of the Jian-10, Qin Feng has proposed a large number of plans, and these plans have been verified to be correct.

Now, everyone is looking at Qin Feng again.

"We can only increase the dive angle." Qin Feng said: "You have to dive to an angle of at least thirty degrees to reach this speed. ”

Dive to thirty degrees? Hearing Qin Feng say this, some people immediately objected: "No, in this case, the danger is too great." ”

If it is in normal combat, it is possible to dive to 90 degrees, and the Stuka in World War II was a famous dive bomber, but this thing is not easy to control, the speed of the dive is fast, and it is easy to disintegrate on the spot.

At that time, the dive angle of 20 degrees was designed to ensure safety, but now it is said that if you want to dive to 30 degrees, you can only increase it by 10 degrees, and the risk will increase dramatically.

"Yes, it's dangerous, but because it's dangerous, don't we fly? Guys, the Air Force has already placed an order, and by the end of the year, we have to fly all the subjects, and now we don't have time to delay. Qin Feng said: "We must bear a certain amount of danger!" ”

The Air Force placed an order, which is not only a spur, but also an encouragement, but also a kind of pressure, if you can't finish flying this year, what if the plane leaves the factory, what if there are still problems?

After the plane was built, a new problem arose during the test flight, and the parts of the aircraft had to be adjusted, and what was produced before was scrapped.

So, they didn't have time to delay and had to finish it as soon as possible.

In this case, you will have to increase the dive angle.

"Of course, we don't break through that much at once, we can take our time." Qin Feng said: "I suggest that our last 100 kilometers per hour speed be divided into five sections, and only add 20 kilometers per hour each time, and gradually experiment. ”

Song Lao nodded: "In this case, then let's take a risk, gradually test the flight, and control the risk within a reasonable range, Qin Feng, you also have to be careful, in the test flight, if you find a problem, immediately end the test flight and return to check." ”

Qin Feng nodded.

The angle of twenty degrees is not very big, and if it is thirty degrees, it feels like a roller coaster, especially, this is not like air combat fighting, the angle of air combat dive will be very large, but it will not dive for thousands of meters in succession, now, Qin Feng listened to the roar of the engine behind him, pushed the operating lever, and at the dive angle of thirty degrees, he dived down at high speed at high speed, his body trembled with the fuselage, and his heart was also diving out with it.

The speed is getting faster and faster, and finally, breaking through the 1,350 that has not been able to break through, reaching 1,370!

The first test flight, there was new progress, and then continue the test flight!

The second time, the plane continued to accelerate, and after reaching 1,370, it continued to accelerate, and just when the flat display in front of it had just indicated the number of 1,380, Qin Feng heard a bang.

"Report, airframe anomaly." Qin Feng shouted on the radio while turning off the afterburner, and then slowly pulled the operating lever.

In this kind of test flight now, the plane is close to the edge of the limit, after all, this is a low altitude, the air density is high, if the pull rod action is more violent, maybe the plane will disintegrate all of a sudden, after he turns off the afterburner, the speed suddenly comes down, and then, the nose of the nose begins to slowly flatten.

What happened to the sound just now? It can't be a landing gear, right?

Other Qin Feng is not worried, the last time he flew the leopard, the rudder fell off and flew back, but if the landing gear failed and could not come out in the end, then it would be a big trouble, this is also a situation that Qin Feng is most worried about, it is useless to worry, as a test pilot, you have to take risks.

"001, return immediately." Voices came from the headphones.

When the Jian-10 fighter appeared in everyone's field of vision, everyone was shocked into a cold sweat.

"001, the lower surface of the skin is torn." It was shocking to see that a large piece of skin had been torn open under the belly of the machine, as if the lid had been opened on a can.

"001 received, put down the landing gear, please check the landing gear." Qin Feng shouted.

The skin is torn, but there is no big problem, as long as the landing gear is normal.

He flipped the switch, put down the landing gear, and soon the sound of the tower came from the headphones.

"The landing gear is normal."

The J-10 fighter landed steadily on the ground, and when Qin Feng came down, he glanced under the fuselage, and suddenly opened his mouth wide: "No, it's so serious?" ”

The skin under the fuselage, starting from the third beam, has been pulled to the fifth beam, and various parts inside are exposed, and the aluminum alloy skin on the outside has become wrinkled, like a crumpled piece of scratch paper.

"This part of the skin is not designed to be strong enough." Song Lao also frowned.

When the aircraft is designed, it is definitely not as strong as possible, which will also lead to an increase in the weight of the aircraft, in the aircraft, designers often rack their brains in order to save a gram of weight, such as the Su-27, the aircraft designers are miserable on how to lose weight, and even punch the girders of the aircraft.

Therefore, the design of many places is based on the theoretical value, and it is enough to increase the margin of about 10%, and there will be absolutely no unlimited increase in weight.

Well, the result that is now appearing is that the intensity here is not enough.

What should I do if the strength is not enough? The best way, of course, is to fly back to Chengdu, study it carefully there, and increase the intensity, but it is too late in time!

"Let's go, let's go into the hangar." Song Lao said.

How to increase the strength, find a way to solve it in the hangar, how to reinforce how to reinforce, find out a feasible plan, and then, send the design drawings to Chengdu to produce, produce it, and then transport it over, continue to test flight! Only in this way can you save as much time as possible.

On the spot, everyone worked all night to recalculate and improve the new design, and the next night, the newly produced skin had been delivered.

Test flight, and proceed!

However, for several days, the meteorological conditions were not strong, the crosswinds were too strong, and the air currents were too strong, which was not conducive to the testing of the aircraft.

I have been waiting for half a month, and just when Qin Feng was impatient, the good weather finally came!

On this day, the temperature was full of minus 20 degrees, Qin Feng was wearing a winter flight leather jacket, and he felt a little cold, when he stepped back on the plane, he glanced at the skin a few times, brother, be more powerful, it depends on your performance!