Zhang Hao stood next to him and watched quietly.

The plane began to roar, and the sound of jet engines, which Zhang Hao had only heard in movies in the past, was finally heard in reality. The sound was light and surging, the sound of yearning for the sky.

A faint air flow erupted from the rear of the plane, and the plane slowly taxied forward to the outside of the warehouse, and after aiming at the runway, the plane erupted into an explosion-like sound, and the rear of the plane erupted into an incompletely burning, red flame. But soon, the flames turned blue, pale blue, and even a faint purple.

The engine's tail flame burst into the air with a tearing, screeching sound.

The plane accelerated rapidly, the roar quickly faded away, and the plane quickly became smaller in the field of vision. After about a dozen seconds, the plane suddenly cocked, and then with a long roar, the plane rose from the ground and the landing gear began to retract.

Only then did a strong wind roll up on the runway.

The staff at the base covered their brows with their palms and watched the plane lightning-fast into the sky. Compared to propeller aircraft, jet fighters are like real dragons, and after they take to the sky, their speed increases even faster.

The plane quickly became smaller at an unimaginable speed and soon became a black dot. After that, the black dots also disappeared, and only the magnificent and low echoes between heaven and earth gradually dissipated.

But the work on the ground doesn't end there. A new set of equipment is working, which is ...... Intercom!

Of course, walkie-talkies relying on computer and chip technology have not yet appeared, but the researchers of Dayang Group have temporarily designed a very practical plan with the ideology of the formation and the magic weapon.

They made a magic weapon, which was a 'magic weapon' class engine with a keyboard. This is a full-size keyboard, which is also one of the by-products of computer technology research.

This keyboard can be used to send combination codes through the telegraph in the form of root words or pinyin.

The telegraph on the other side can receive signals according to the individual keys of the keyboard, and then interpret the meaning of the other party through a magic weapon decoder.

Compared to the traditional telegraph, this new method is more convenient, and one person can completely manipulate it, and even professional knowledge is required - just refining a new magic weapon, and this is not difficult.

Of course, if you want a telegraph to send a signal, you can't put it in the storage space, you have to take it out. That's the only trouble.

At this time, the telegraph personnel constantly reported the situation of the clouds sailing in the sky. Following Yun Yangfan, there is also an engineer who is responsible for supervising the status of the aircraft.

In this aircraft test, the external formation was not turned on at all - in fact, there was no external formation on the prototype. Except for the portholes.

On the ground, Lin Yinghao, Zhu Min, Leng Fengxue and others couldn't take care of Zhang Hao, and everyone was already busy. According to the report on the plane, they need to check and think about all the process steps and design flaws.

Zhang Hao listened quietly and did not disturb everyone. It's just that soon Zhang Hao also found a little problem:

Airplanes cannot exceed the speed of sound, even if they can fly to a terrifying altitude of 180 kilometers.

When it is relatively close to the ground, the air is dense, and the speed of sound can reach 500 meters, or 1,800 kilometers per hour, and the plane cannot exceed the speed of sound.

When we reach an altitude of 180 kilometers above the aura layer, the density of the air drops, and the speed of sound plummets to 350 meters, which is 1,260 kilometers per hour, but the plane still can't exceed the speed of sound!

On the ground, the aircraft can reach a maximum speed of 1,650 kilometers per hour, which is equivalent to about 92% of the speed of sound – a speed that significantly exceeds the speed of upper-air sound.

But when it comes to high altitude, the maximum speed of the aircraft is only 1180 kilometers, which is only about 94% of the speed of high-altitude sound!

Aircraft can only reach subsonic speeds at the maximum, but they cannot break through the speed of sound in any way. There seems to be a powerful law that prevents aircraft from breaking through the speed of sound.

And even when it reaches subsonic speeds above, the plane begins to tremble violently, and according to the reports of Yun Yangfan and technicians, the plane is like a small wooden boat shuttling through the wind and waves, and it seems that it can disintegrate at any time. In that extreme flight, there was a creak throughout the plane.

That is, the structure of the aircraft is strong, otherwise it would have disintegrated. And at such an extreme speed, they didn't dare to try too much.

"It's weird!" the scientists on the ground exchanged their heads.

Without the help of spells to break through the speed of sound, there are many products of the Ocean Group. Whether it's a sniper rifle bullet or a cannonball, it can easily break through the speed of sound.

There is no reason why such a sophisticated high-tech product as an airplane, and after being precisely designed, cannot break through the speed of sound!

Could it be that the airplane is too big? The heated discussion also made the airplane keep trying.

They even try to make the plane dive from a high altitude, then turn off the engine and use the force of the fall to break through the speed of sound. But apparently this plan failed, the air resistance at the speed of sound was beyond imagination, and the speed of the aircraft quickly decreased after the engine was turned off.

The discussion became more and more intense, but at this time, Zhang Hao suddenly woke up, "Let the plane come back." I have an idea that maybe needs to be validated. ”

Then, Zhang Hao took out the flying sword and drew it on the ground. The cement floor was scratched by Zhang Hao, but it was very slight.

"You see, whether it's bullets, cannonballs, or ballistas, the lines are smooth as a whole, and the front and back are generally thick. But airplanes are not.

The plane with the wings, the central part is quite bloated! like a fat man.

You guys try to keep the 'cross-sectional area' of the front and back of the plane consistent. Try a thinner wing part of the fuselage. ”

At this time, Zhang Hao almost didn't directly point out the "equal area rule". When the sound barrier is breached, there will be powerful shock waves, which will form a complex fluid environment. However, it is possible to make the "overall structure" of the "appearance of the aircraft" simpler to eliminate this effect.

And the equal area rule is this principle.

The so-called equal area is the sum of the cross-sections of the aircraft from front to back, which is the same. So you see, all fighters are "small brute waists".

It took five years of hard work for a large number of good scientists on Earth to figure out the 'equal area rule', and some pilots died as a result. As for the national wealth consumed in this process, it is even more difficult to estimate.

However, Zhang Hao does not want Dayang Group to waste time on this.

Lin Yinghao and others were skeptical, but they still let the plane return and began to study.

They first simulated it with a model in the wind tunnel, but it would take a month or two to complete the simulation and improve. Zhang Hao encouraged everyone a few words and left. Next, there is more important things to do - go and fight with the Qinglong family!

After Zhou Xueyao's awakening, Zhang Hao also felt that the twelve families could not be too leisurely, so they could arrange in the back for a long time. It is also necessary to show the muscles of the Ocean Group to the world.

The vehicle was driving smoothly, but Zhang Hao already had a plan in his heart.