Although Zhu Lei opened the right to purchase plasma thrusters and anti-gravity engines, even the largest spaceship that can be built by civil forces will not exceed 50,000 tons, and the spaceship they make is fundamentally incomparable with the spaceships produced by Zhu Lei and the official Ming Dynasty in terms of speed and defense.

So whether it is Zhu Lei himself or the state-owned shipyard of the Ming Empire, they are very confident that they will win in the future competition, not to mention that the plasma thruster system is produced by Zhu Lei, and now Zhu Lei's Yongan Group plasma thruster has been updated to the fifth generation of plasma thruster, compared with the previous generations, the current thruster is stronger, more energy-saving, smaller in size, and more diversified in function. If under such circumstances, Zhu Lei and his Yongan Group still can't compete with these private shipyards, then he can simply die.

What's more, his Yongan Group, has been researching controllable nuclear fusion for nearly 20 years, and just a month ago there was finally a breakthrough in controllable nuclear fusion technology, according to scientists' calculations, due to the breakthrough, the first controllable nuclear fusion engine can be made in a few months, and then he can finally build a spaceship that can truly interstellar voyages, and the size of the spacecraft does not have to be limited to a range as now.

Because the controllable nuclear fusion technology is about to succeed, Zhu Lei has also changed the level of the size of the spacecraft in the Ming Empire, after all, the commander of the Ming Empire's space army is in charge of the entire Ming Empire's space program, and he has the right to divide the current Ming Empire's spacecraft.

So this time in the cabinet meeting, he and the ministers in the cabinet discussed the matter of the future classification of spacecraft.

According to the information obtained from the Super Plane Mall, Zhu Lei divided the spaceship into six levels according to the mainstream division method.

All spaceships below 10,000 tons are planned to be aerospace vehicles, which means that all spaceships under 10,000 tons cannot be called spaceships at all, so such spaceships are collectively referred to as aerospace vehicles.

Between 10,000 tons and 1,000,000 tons, these spacecraft are all kept as small spacecraft.

And the spacecraft belt between 1 million and 10 million tons is planned as a medium-sized spacecraft.

Spaceships between 1000 and 100 million are classified as large spaceships.

And a spaceship of 100 million tons to 1 megaton is called a heavy spaceship.

Spaceships over 1 megaton are called super-heavy spaceships, or superspaceships.

And this division method is also the common division method of all cosmic technological civilizations in the plane mall.

However, there are also subdivisions of each level in this classification method, such as spaceships under 10,000 tons, or aerospace vehicles.

Although this type of aircraft is basically used as a means of transportation between planets and spaceports in every civilization, some of these vehicles are spaceships with certain astronautical capabilities, so this type of aircraft is divided into two classes, and those below 1,000 tons are divided into one class, and those between 1,000 tons and 10,000 tons are divided into one class.

Although the various civilizations in the universe have different names for each level of spaceship, the basic division is still like this.

However, according to the results of the discussion between the cabinet and Zhu Lei, all spaceships under 1,000 tons are called aerospace planes, and spaceships of 1,000 tons to 10,000 tons are called spaceships, and only spaceships of more than 10,000 tons can be called spaceships.

As for the other five levels of spaceships, except for the super heavy spaceship, the remaining four levels are all subdivided into two levels, that is, the first-level spaceship and the second-class spaceship.

Of course, in addition to the weight of the spaceship, the volume of the spaceship, the size of the spaceship and the range of the spaceship will also be taken into account.

However, these are all ways to divide civilian or non-combat spacecraft.

However, the division method of combat spacecraft is completely different from that of civilian spacecraft, and the division method of combat effectiveness spacecraft still inherits the division method of surface warships on the earth.

Combat spaceships are generally divided into frigates, destroyers, cruisers, battleships or aircraft carriers, and star fortresses, and each type of warship is divided into light and heavy types except for star fortresses, but these types of spaceships are all more than 10,000 tons, and less than 10,000 tons of spaceships, of which spaceships below 1,000 tons are all classified as space fighters, and spaceships between 1,000 tons and 10,000 tons are all called space airships.

Therefore, according to this division method, the largest spaceship in the entire Ming Empire is only a small spaceship, but as long as the controllable nuclear fusion engine technology comes out, the Ming Empire has the strength to create medium-sized spaceships, that is, spaceships with a tonnage of more than 10 million tons.

However, even if the controllable nuclear fusion technology comes out, it is impossible for the Ming Empire to create a heavy spaceship now, after all, the tonnage of the heavy spaceship must exceed 10 million tons, and according to the information in the super plane mall, there are also hard regulations on the size of the heavy spaceship, so there is nothing that can be done about such a spaceship with the current technology of the Ming Empire.

It is very difficult to build a heavy spaceship, even if it is a mid-level and high-level civilization in the universe, and it is only after reaching the advanced civilization that it is a matter of course to build such a heavy warship.

And the ultimate weapon in the universe like the Star Fortress is impossible even if it is an advanced civilization wants to make it, because the Star Fortress not only has absolute requirements for weight, volume, and mass, but also has very high requirements for combat power, defense, etc.

Therefore, it is impossible for advanced civilizations to create interstellar fortresses, and only the ultimate civilization in the universe can create interstellar fortresses, so the Ming Empire does not have to think about such a weapon now, even if the Ming Empire is now a hybrid civilization, it is powerless to do anything about the ultimate weapon like the interstellar fortress.

However, these are not things that the Ming Empire needs to consider for the time being, after all, the Ming Empire is not even a mid-level civilization now, it can only be regarded as a mid-level civilization with one foot, but as long as it waits for a few months after the success of controllable nuclear fusion technology and the creation of a medium-sized spaceship that can carry out interstellar voyages, the Ming Empire can be regarded as a standard mid-level primary civilization.

Of course, Zhu Lei believes very much in the combat effectiveness of the universe army of the Ming Empire, even if it is compared with the intermediate intermediary civilization, it is not much worse, of course, this is under the same quantity.