Nangong Zhi's inquiry, Zhang Hao heard it, but he didn't look back. Mainly...... You didn't ask me directly.

The target of Nangong Zhi's inquiry was the commentator arranged by the Ocean Group. These are actually graduate students in the internship period.

The narrator simply explained: "In fact, the Star Cannon weapon system is already accumulating energy now.

On the other hand, because the starry sky cannon is powerful, its recoil is also great. The action of force is mutual, and the starry sky cannon and projectile in a stationary state are subjected to the same force.

As a result, the cannons retreat during firing, which will undoubtedly prevent the projectiles from reaching their maximum power.

Once the cannon body retreats, a considerable part of the energy will be lost, and in addition, the retreat of the cannon body will lead to a shortening of the actual effective length of the barrel, resulting in insufficient acceleration time of the shell, and a reduction in the firing degree.

In this case, accelerate in advance, so that the cannon body has a certain speed and energy, which will cancel the reaction force when firing, so that the power of the starry sky cannon can be maximized.

In addition, if fired from a standstill, the cannon itself will retreat due to recoil, causing its orbital velocity to fall below the minimum orbital velocity, and it will be pulled back to the ground by the planet's gravity.

The Starry Sky Cannon is heavy and takes a long time to accelerate. Therefore, in order to prevent uncontrollable situations from occurring, it is only possible to accelerate in advance. ”

Everyone listened and nodded their heads. Even Nangong Zhi had to nod. Although these things feel simple to point through, they can't ignore their importance. Sometimes it's just a small oversight that leads to the defeat of the entire campaign.

When the rail cannon accelerated for about 17 minutes, the voice of Huang Mingshan, the person in charge of the front, came from the observation room: "100% energy storage, ready to launch!"

The next moment, everyone saw that the rail cannon in space that was accelerating and gradually trying to escape the gravitational pull of the Tianyuan Star suddenly stopped. The originally beautiful, light blue plasma engine tail flame in the rear suddenly trembled and confused.

As for the front of the cannon, nothing can be seen. There is no such gushing flame as when the cannon is fired.

It was so quiet, and there was not even a sound in space. If it weren't for the sudden pause of the giant cannon itself, I'm afraid no one would have known that the starry sky cannon had just completed its first launch.

The launch of 160 small high-power nuclear islands was completed in 17 minutes, and everyone would like to see how powerful it is. It's a pity that this rail cannon wants to fly out of the star system. With such a powerful cannonball, as long as the Ocean Group is still a little normal in its brain, it will not be used to attack the planets in the galaxy casually.

A special rail-mounted artillery shell weighing 50 kg with a design flight speed of 500 km/s!

To get an idea of the speed of 500 km/s, you can follow several astronomical figures of the current Ocean Group:

The first cosmic velocity, which is the velocity around the gravitational attraction of the celestial element, is 25.3 kilometers per second;

The second cosmic velocity, that is, the speed at which it gets rid of the celestial elementary star, is about 36 kilometers per second;

The rotational speed of the Tianyuan star is 30 kilometers per second;

The third cosmic velocity, the vehicle emitted from the orbit of the Tian Yuan Star, has a 'minimum velocity' of 16.7 kilometers per second. It should be noted that the so-called minimum speed is added to the rotational speed of the Tian Yuan Star itself. That is, its absolute velocity is '30 + 16.7 = 46.7 ' kilometers per second.

This is still in the orbit of the Tian Yuan Star. If you're near Venus, or even the Sun, it's even faster.

Then there is the rotational speed of the Sun, which is 250 kilometers per second.

It is the fourth cosmic velocity, which is 120 kilometers per second, and the speed of the sun itself, which is 370 kilometers per second.

In other words, a rail-mounted artillery shell with a speed of 500 kilometers per second can theoretically fly out of a large galaxy! As long as it is launched, it should not be contrary to the rotational speed of the sun.

At a speed of five hundred kilometers, it already has the capabilities of a preliminary interstellar strike. Of course, at a speed of 500 kilometers per second, it would take 600 years to cross a distance of one light year, which is the diameter of the gravitational influence of the galaxy!

For 600 years, the target has long since lost sight of where to go.

However, if it is to attack targets such as planets, it is completely feasible. The rules of motion of the planet can be calculated.

However, regardless of the power of the rail cannon, its firing effect is really invisible. Even the eyes of a cave master can't catch a small object with a speed of 500 kilometers per second.

Soon Huang Mingshan reported to Zhang Hao: the launch was successful. This will be followed by a brief inspection, followed by nine consecutive launches, after which a major overhaul will be undertaken. The overhaul process is expected to take one month.

The first Starry Sky Cannon was still experimental, so it was necessary to check, verify, collect data, and gain experience.

After a little inspection, an hour later, the Star Cannon was fired a second time, and the direction remained the same, it was fired in the direction of the Red River civilization.

By the way, because the launch from Tianyuan Star to the location of the Honghe Civilization is all in the interior of the large galaxy, it is basically possible to ignore the movement of stars and other issues. It can be seen as a relatively static system.

That is, the speed of the shells of the starry cannon, in the void, will fly at a speed of 500 kilometers per second. However, the Red River civilization is closer to the core of the Great Galaxy, and if the cannonball can fly, the speed will increase to 800 kilometers per second.

At a distance of 700 light years, the shells are expected to take 3,300 years to fly – if the shells don't run into obstacles along the way.

The advantages of the rail gun can also be seen from this point. If it's a laser, particle technique, etc., if the flight distance is long, it will basically disperse by itself. But the railgun can keep flying until it meets the one it was destined to meet...... Unlucky egg~

Since then, Zhang Hao and others have stopped paying attention to the test of the starry sky cannon. It's been a year of trouble, but when I finally observed, I didn't even bring a halo, and I said it was a good visual feast.

It is also the scene of a laser launch spacecraft on the ground, which is the most spectacular. A pillar of light reaches into the sky, reaching as far as the eye can see. Even if it breaks through the atmosphere, because the laser contains a large number of particles, the laser still emits a faint orange brilliance.

From a distance, it looks like a pillar of heaven pushing the ship directly from the ground into space.

The tour is over, but the tests are still ongoing. There are a few people who are more inward-focused than those who just want to see the grandeur.

This invisible, powerful weapon really brings a sense of security to everyone. Although it is not known what level such technology belongs to in the Red River civilization.

However, on the ground before, the Ocean Group had tested the power of the rail cannon with the remains of the spaceship on Liuli Island. At that time, the maximum speed of the rail gun on the ground was 100 times the speed of sound, which was 50 kilometers per second. However, such a rail cannon can easily penetrate the shell of the Liulidao spaceship.

Then, the speed of 500 kilometers per second should be enough to penetrate the spaceship of the Red River civilization.

However, Zhang Hao is cautious. After all, in the past 100,000 years, or even 200,000 or 300,000 years, the technology of the Red River civilization may have made some miraculous progress. For example, to create nuclear-grade materials!

Previously, the spaceship material of the Xuanhuang civilization was atomic-level, but it can actually be regarded as a perfect structural material similar to diamond, and artificially strengthened.

But this material is atomic-level after all, and the atom itself is very 'empty'.

But if it is a nuclear-level material, such as the material of the 'water droplet' mentioned in the world, it will initially reach the point of indestructibility.

Although Zhang Hao also felt that the Red River civilization should be difficult to do. After all, whether it is the Red River Civilization or the Xuanhuang Civilization, they are both cultivation civilizations. Most of its own explorations of the material world are superficial.

But this so-called 'superficial taste' is also aimed at advanced civilizations.

The toys of children of advanced civilizations, placed on ordinary planets, may cause deadly threats. For example, the automatic robot toys in the hands of children may mutate into the intelligent technology of the Matrix in the former world.

Therefore, Zhang Hao asked the scientific researchers to continue to improve the limit of the rail gun. If the speed of the rail cannon can be increased to a tenth of the speed of light, it should have the ability to traverse the entire large galaxy.

In short, before encountering the Red River civilization, everyone had to do their best to develop technology and try to improve the level of technology and the power of military weapons.

Because people can't afford to gamble. Once lost, the entire Tian Yuan Star will be enslaved or completely cleaned up.

However, Zhang Hao has a lot of things, and Dayang Group has more plans. After rewarding and encouraging the staff in space, Zhang Hao hurriedly packed his bags and ...... from space Leap down.

Relying on the cultivation of the Cave Void Realm, Zhang Hao experienced a real bungee jumping.

Descending directly from space to the aura layer, the True Yuan shield around him actually supported the flames and impact when he landed. Finally, enter the aura layer and use spells to land steadily.

It only took less than 20 minutes for Zhang Hao to return to the headquarters of Dayang Group from space.

After dealing with government affairs a little, Zhang Hao came to the space center again the next day.

Here, a new flying vehicle is being created: the aerospace plane!

Since the successful research of plasma engines, Zhang Hao ordered relevant technicians to start researching aerospace aircraft.

A space plane is not a space shuttle. Space refers to aviation, and space refers to astronautics. Aerospace aircraft, which can fly in the atmosphere and fight in space, are amphibious technologies!

Aerospace planes are more agile and can take off from the ground and go straight into space. If you take off from the ground, you only need a runway, no more launch towers, etc.

The technology of the transmission tower is complex, the cost is expensive, the maintenance is cumbersome, the efficiency is first, and the carrying capacity is weak.

In contrast, aerospace aircraft only need a runway, and the maintenance of the runway is simple. And when the aerospace plane takes off, it can use air buoyancy, and its carrying capacity is beyond imagination.

With the advent of aerospace planes and mature technology, the cost of space transportation will be reduced from 4 yuan per gram to 4 yuan per kilogram, or even lower! The technical personnel of the Dayang Group have repeatedly demonstrated this.

Therefore, Zhang Hao pays special attention to aerospace aircraft.

By this time, the first aerospace aircraft was about to be assembled.