And it carries night vision and infrared sensing functions.

There is also an intelligent recognition function, and the cruising range can be set to sixty kilometers.

After the M3 debuted.

The relevant units are happy.

Although the price of the upgraded M3 has increased significantly.

But for the relevant units.

Overall or save money.

Because patrolling in the plateau area is very troublesome and very hard.

In order to reduce patrol pressure.

In general, each patrol is responsible for a range of ten kilometers.

But even ten kilometers are released to more than 20,000 kilometers along the land.

Then more than two thousand patrols are also needed.

Even a patrol of ten people needs twenty or thirty thousand people.

But if the patrol of the M3 is used.

Not only can the patrol radius be increased tenfold.

There are also drones that can cruise automatically.

The patrol efficiency and area will be greatly increased.

Although in some important areas, it is still necessary to rely on human supply for patrols.

But in some unimportant areas, even the kind of countries with better relations, it is not so troublesome.

But you can't help but patrol.

But if you use the M3 to patrol, it will be much more convenient.

Although the price is as high as four million. [Actually, four million is not expensive. One armored car also costs four million. Despite the large mass of the armored car, the M3 technology has a high gold content, and it does not burn oil. Overall it's still very cost-effective. 】

But after all, it is a one-time investment, and you don't eat forage during the whole process, as long as you charge it.

Five years according to the 'minimum' design life.

The average is only 2,000 yuan a day.

And to form a patrol team, not only to build sentinels, but also to be responsible for food and drink, the cost is naturally not small.

Not to mention zooming in to a national scale.

This is even more exaggerated.

If you think about it, it's still a good deal.

Because with this thing, the number of patrols will be greatly reduced.

Maybe it's about the same with only 5,000 people in the whole country.

Of course, Su Han plans to design a patrol version of the Wooden Ox Flowing Horse in the future.

More drones can be carried when the time comes.

As long as there is no one to release along the way, no one can complete the cruise independently.

It's even more practical.

……

The relevant units ordered fifty M3s in one go.

It is already a big order for Longhan Robot.

……

September.

Lian Shanshan finally succeeded in getting pregnant.

Even the family and Yuan Meixia were very happy.

Especially even the family.

After waiting for so many years, I finally waited for news from my grandson.

The surprise was certainly indescribable.

Of course, Yuan Meixia was also very happy.

It is natural for older people to have many children and grandchildren.

……

Su Han had just finished busy when Lian Shanshan was pregnant.

It's Dai Lan's due date again.

It's not okay to keep him busy.

Whether it is Shao Yutong or Dai Lan, it is the first time to have a child.

So I have to be by my side when I give birth.

So as not to take care of one or the other, it will affect the postpartum recovery of the other party.

Now it can only be said that there are more wives and more troubles.

In the future, the more children there will be, the more troubles will be.

Think about having six children in the future.

A child is twice as naughty.

Six children are six times naughty.

Of course, it may also be six six thirty-six times naughty.

Thinking about it also makes him a little big.

But it can't be helped.

The mother wants to hold her grandchildren.

The old father-in-law and mother-in-law want to hold their grandson.

Whoever can't satisfy their preferences can't do it.

……

Su Han before Dai Lan gave birth.

Rushed back to the vast company to look at the progress of research and development.

Although there is a dragon staring at it, it is not a big problem.

But I am also the project leader and chief engineer.

It is also appropriate to come to the scene to cheer everyone up.

At this time, the prototype production line of the Brontosaurus L1 engine was nearing completion.

And it was produced several units at once.

Because after the successful test run, it is necessary to test hovering on the arrow body.

Su Han's biggest concern is whether the hover test can be successful.

Although Shenlong's big data simulation should be no problem.

But the plan hasn't changed much.

The real world is not as controllable as big data simulations.

……

Su Han returned to the capital.

Dai Lan's due date is almost over.

Entered the hospital ahead of schedule to give birth.

Shao Yutong and Lian Shanshan also rushed over to accompany them.

No matter what the two say, they are also Su Han's big and small wives.

What's more, several of them are still girlfriends.

Dai Lan had a reaction a few days before her due date.

Su Han stayed in the delivery room for the second time and watched the birth of two children.

This time it's two daughters.

Of course, Su Han was very happy.

Yuan Meixia is also very happy, because she has a grandson and a granddaughter, naturally there is nothing happier than this.

The names of the two daughters were given by Su Han himself.

Eldest daughter: Su Jiazhen.

Second daughter: Su Jiabao.

……

Just when Dai Lan was in confinement.

The first prototype of the Thunder Dragon L1 was successfully put into trial production.

Prepare for a test drive.

However, this time it was not a test bench with a national prefix unit.

Instead, they use Haohan's own test bench.

Su Han didn't have time, so he didn't go.

The test run was presided over by Pan Chi.

The Brontosaurus L1 lives up to expectations.

The thrust reached two hundred and twenty tons.

Although the thrust alone is not as good as the Fire Dragon H2.

But the Brontosaurus L1 weighs only two tons.

Fire Dragon H2 is more than five tons.

Then the thrust-to-weight ratio of the Brontosaurus L1 reaches an astonishing 110 to 1.

The nozzle area of the Brontosaurus L1 is only 1.3 meters.

The volume is much smaller than that of the Fire Dragon H2.

What's more, the room pressure of the Brontosaurus L1 has reached an astonishing 34MPa.

This is already equivalent to three hundred and forty atmospheres.

A higher room pressure represents a higher combustion density.

The specific impulse of the Brontosaurus L1 reached three hundred and thirty-five.

This is already the rhythm of the world's first rocket engine.

The entire R&D team was naturally excited.

You know, this is a methane liquid oxygen engine.

Liquid oxygen and liquid hydrogen liquid oxygen relative to kerosene.

Methane liquid oxygen does not wear much wear and tear on the equipment and can be reused.

It seems that the biggest obstacle to the recoverable rocket that Suhan said has been solved.

Su Han knew that the news was of course very high.

But that's just the beginning.

Got the engine, and the hover test.

And his goal is to complete the hover test by the end of the year.

Naturally, the time pressure left for the team is very high.

The assembly of the Brontosaurus L1 and the Little Ant hovering rocket must be completed as soon as possible.

……

The Jin Yijun team of Longhan Robotics.

This will complete the production of the world's first prototype metal 3D printer with a size of 30 centimeters.

The printer uses a completely new carbon-tungsten alloy powder.

Successfully printed a 30-centimeter rocket engine shell.

Tested.

The comprehensive density of this shell exceeds the density of the shell used in the Brontosaurus L1.

If it is possible to produce a 3D printer with a size of more than two meters.

At that time, it will not only be able to greatly increase the production speed of rocket engines.

Engine performance will also be greatly improved.

However, it is not so easy to achieve a two-meter 3D printer.

The next goal of Jin Yijun's team is a 3D printer with a size of 1.2 meters.

……

Several engineering prototypes of the first phase of the Huolong H1 and H2 were delivered.

All of these engineering prototypes have successfully passed the acceptance of relevant units.