Test flight, there will be danger at any time, although the high altitude has also pulled such a speed, but the pressure on the body is much smaller than at low altitude.

If you use specific data, it is at a speed of Mach 1, the height is 5000 meters, and the speed pressure is only 3856 kilograms per square meter; 5003 kg per square meter at a height of 3000 meters; At an altitude of 1,000 meters, it is 6,416.4 kilograms per square meter, and when flying close to the ground, this pressure is as high as 7,231.8 kilograms per square meter.

It's almost twice the pressure of 5,000 meters, and under this huge pressure, all surfaces of the body will be damaged at any time due to this huge pressure.

Qin Feng was mentally prepared for this, and now, the speed was only seven hundred, and he was still far from the goal.

The next day, after repairing the damaged landing gear guard, Qin Feng's test flight began again.

Keep flying!

Coming to this empty Gobi again, Qin Feng lowered the height and turned on the afterburner at a distance of two hundred meters.

Accelerate, accelerate!

As the speed increased, Qin Feng kept pushing the operating lever to offset the fighter's head-up moment, allowing the fighter to continue to fly at a level level, and soon, it reached yesterday's speed of seven hundred.

Yesterday's light sound, today is gone, it seems that the new aluminum alloy baffle strength is high enough, then continue to accelerate!

720，730，750.

As the speed continued to increase, Qin Feng's hand also slowly pushed the lever forward, and the green tendons on his arm slowly erupted, obviously having exhausted his strength.

In the low air, because the air is dense, the moment of the air flow blowing on the rudder surface is also very large, and when he breaks the operating lever, he is resisting with his hands and the rudder surface, and his arm muscles soon become sore.

760，770.

Before the pointer could point to 800, Qin Feng finally admitted defeat.

There is no way.

Because his arm couldn't hold on anymore.

The pilot of the fighter jet, when he sits in the cockpit, between his legs is the joystick, which is usually controlled with the right hand, and the throttle stick on the left is controlled with the left hand.

And now? Qin Feng almost put both of his arms on the operating lever, even so, the feedback torque from the rudder surface still made his arms sore, and he couldn't maintain it anymore.

It's not that Qin Feng's momentum is not big enough, when he wrestles his wrists in the test pilot, Qin Feng can also rank in the top three, and if he changes to others, he can't hold on.

No, you won't be able to continue to speed up at all!

As soon as Qin Feng's hand loosened, the nose of the plane immediately lifted up and flew towards space, his face full of frustration.

This test flight can't go any further!

This low-altitude test flight with a large table speed must exceed Mach 1 at least to determine whether the strength of the fighter's fuselage is sufficient at supersonic speeds, but now?

Mach 1, converted into the number on the dial, it is more than 1,002, and now it is less than 800!

This test flight can't go any further.

Qin Feng's arm was extremely sore, and when he landed, he even felt that his arm began to tremble.

"Qin Feng, why are your two arms bruised?" When he got off the plane and rolled up his sleeves to take a look, Wang Yang, who had just finished the high-altitude test flight mission, couldn't help but say.

Qin Feng looked at his two arms, his face was very helpless, flying other subjects in the air, his arms had never been in this situation, but now, the muscles of his arms were actually overexerted!

"If you want to reduce the force of the lever, you have to increase the power of the operating system, that is, increase the oil pressure in the hydraulic line."

After flying, it's time to analyze the problem again, and when I heard a technician say this, Lao Wang immediately shook his head: "No, no, this is absolutely not good, our oil pressure has been set at the time of design, and it must not be changed, if it is changed rashly, there will be a big problem, I dare not sign such a plan, in case a pipe bursts, there is no responsibility for me." ”

When Lao Wang arrived at this juncture, he once again showed his determination, in short, just don't care about my business, don't come to me for trouble.

However, what he said is also in line with the truth, and rash improvement will cause big problems.

Of course, if it is raised, it will definitely reduce the pilot's operating torque.

At the beginning, when the fighter first appeared, the operating rod in the pilot's hand was linked to the steel wire, and he completely relied on the strength of his arm to move the rudder surface.

Generally speaking, the second-generation aircraft are around 21 000 kPa, and when it comes to the third generation aircraft, it becomes 28 000 kPa.

The more maneuverable the fighter, the easier it is to operate the rudder surface, and the higher the pressure is naturally required, with the exception of fly-by-wire.

Now, if you want to change the pressure, that's not going to work, and what if you don't change the pressure, what can you do?

"Guys, I don't think we need to complicate this issue, it's really not advisable to adjust the pressure, let's just adjust our lever." Qin Feng put forward his own suggestion here: "This is the basic principle of leverage, and it is easy for us to adjust. ”

When Qin Feng said this, Lao Wang couldn't help but shake his head, Qin Feng, aren't you usually very smart? The proposed solution is also very professional, why is this problem so confusing today?

Can the lever be extended?

If you lengthen the lever in the cockpit and the arm is larger, you can reduce the consumption of physical strength, but the space in the cockpit is limited, how far can your arm shake the lever?

"I'm not talking about the lever in the cockpit, I'm talking about the lever controlled by the rudder surface of the elevator at the tail." Qin Feng said.

As soon as he said this, everyone immediately realized, and Lao Wang couldn't help but follow: "That is not called the operating lever, that is called the elevator arm, yes, this can be adjusted." ”

The arm can be adjusted to the arm value of the small arm so that the deflection angle of the flat tail can be increased when the push rod is made, and the head-up torque at low altitude and high speed can be balanced to solve the problem of maintaining level flight.

"How's it going, can you still fly?" Wang Ang on the side asked, looking at Qin Feng's arms like this, if he couldn't fly, he could fly once instead of him.

"Yes, of course I can fly." Qin Feng said: "Once the servo is adjusted, I will continue to fly." ”

Gritting his teeth, Qin Feng asked another question: "Penetrating defense at low altitude and high speed, that is already a common combat method for fighters, do Western fighters have to keep pushing the operating stick with their hands when they penetrate the defense like this?" ”

When he was flying just now, Qin Feng didn't expect it, but now such a question suddenly flashed in his brain, so he still has to die of exhaustion?