It was already half an hour later when these disaster relief pioneers left the hall.

Because the food and grass from Boni, Yueli Dynasty and other places had not been sent here yet, there was no major military information on the front line, and the disaster relief matters were stable, so Zhao Dongting did not continue to discuss matters with the ministers in the hall.

After the resignation of the dynasty, he went to the workshop of the Military Science and Technology Department.

Since he returned to Hengyang to kill Xu Huiyuan last time, he has never left the palace again.

In the past, he would occasionally take his ladies out of the palace to relax, but these days, he spent most of his time in the workshop of the Military Science Department.

Li Goudan's Ministry of Science and Technology has not studied anything else these days.

Including Li Goudan, the ten accompanying students who accompanied him to study in the library, and many skilled craftsmen who Zhao Dongting convened from various places, stayed in the workshop of the Military Science Department.

Although the frontier has the advantage, the losses of those soldiers still make Zhao Dongting feel quite heartbroken.

Besides, the unfathomable old eunuch in the Yuan Dynasty was always a variable.

This made Zhao Dongting even more eager to develop the red cannon.

Only in this way can we ensure that the Song Dynasty can destroy the Yuan Dynasty.

Fortunately, all the girls understood and supported him. No one complained these days, but instead he even responded to Zhao Dongting with meticulous care.

When I went to the workshop of the Military Science Department, it seemed to be very lively.

There were dozens of blacksmiths outside, all of whom were open and sweating.

From time to time, people run out with drawings.

The red-clothed cannon requires a lot of parts, and Zhao Dongting encountered a bottleneck in the force-emitting device.

It is necessary to conduct continuous testing before the force-generating device can be produced.

Compared with the force device of the red-clothed cannon, the half-baked grenade launcher he had made before was really considered a pediatric department.

How far can a grenade launcher hit?

At most, a thousand meters is the ultimate, and it should be 700 meters away.

As far as Zhao Dongting knows, the effective range of the red-clothed cannon in the early stage was 500 meters away, and the maximum range could reach 15 kilometers.

Of course this cannot satisfy him.

What he wanted to develop was a cannon that far exceeded that of the grenade launcher, regardless of its power or range.

Only in this way can we be invincible.

At least it must be comparable to the improved red cannon, with an effective range of 1,500 meters and a maximum range of 2,500 meters.

And it can't be as bulky as a red cannon. It can weigh one ton or two tons at any time. I don't know how much manpower and material resources it will take to transport it to the front line.

Push open the door and walk into one of the rooms.

This room is a room where Zhao Dongting usually does research by himself. Apart from him, only people who participated in the research and development can come in.

The room was also lively.

Li Goudan and many skilled craftsmen from all over the world are busy.

They are either drawing pictures themselves or discussing something.

Zhao Dongting walked in. Although someone saw him, no one saluted him.

This was an order issued by Zhao Dongting himself, saying that when he came to the workshop, he was only one of the craftsmen, so that everyone would no longer waste time and interrupt their thoughts to salute him.

Gradually, everyone got used to it.

Zhao Dongting walked behind Li Goudan with slightest steps.

Li Goudan was drawing something on the paper, and she was very fascinated. Even Zhao Dongting didn't notice it when he walked behind him.

Zhao Dongting stretched his neck and looked at Li Goudan drawing the drawings, and gradually became fascinated.

Then about a few minutes passed, and a light suddenly flashed in his eyes.

The grenade launcher he designed before was actually based on a very backward technology principle and cannot be regarded as a real grenade launcher.

Its force-generating device uses elastic force as its main force.

With the current level of technology, the distance that can shoot shells out hundreds of meters through elastic force is already the limit.

This is also the reason why Zhao Dongting was unable to conquer the red-clothed cannon before.

He was in the dead end.

He was always thinking about how to develop a device with greater elasticity, but he never thought about using other forces to fire shells.

Now looking at the drawing drawn by Li Goudan, he suddenly realized.

To be more precise, it is to recall something.

Li Goudan drew dense ripples at the level of the force-explosion device he designed. It seemed that he wanted to use more things like springs.

This is not realistic.

Because it is not easy to press down these springs, and what is even more difficult is to concentrate the elastic force of these springs.

But these ripples inspired Zhao Dongting.

Air pressure! He recalled this word.

In the past, mortars used air pressure to fire! Using the air pressure generated by the combustion of the launching medicine, the shells were impacted out of the cannon chamber! To ignite the launching medicine, you only need to set up an impact needle.

This is not difficult.

"Air pressure!"

"Air pressure!"

Zhao Dongting gradually became happy and started to mutter.

Then, in the puzzled eyes of the people around him, he quickly started writing and drawing with his pen.

This is the real cannon launch device.

He secretly scolded himself for being so stupid that he hadn't recalled this for such a long time.

Little do people know that people will change due to the influence of the environment.

As I spent more and more time in this era, I had a lot of advanced knowledge in my mind, which was gradually forgotten by him.

After a while, a complete drawing was formed under Zhao Dongting's hands.

"quick!"

He handed the drawing to Li Goudan next to him and said, "Let the craftsmen outside drive this thing out quickly!"

His face was still full of excitement.

Li Goudan realized something and was also surprised, so she hurriedly ran outside.

That night, the sound of irons thrusting in the workshop of the Military Science Department did not stop.

Zhao Dongting returned to his bedroom, but it is said that the blacksmiths in the workshop were busy all night.

And I was quite excited until dawn.

And in Zhao Dongting's bedroom, the Le Chan and Le Wu sisters were also tortured.

It is true that people feel refreshed when they are happy.

Zhao Dongting was in Le Chan's room in the first half of the night, and rushed to Le Chan in the second half of the night, the same was true.

But in the morning, he was still refreshed.

I woke up early and started practicing swordsmanship and sword intent on the bamboo sea.

He had a premonition that there should be no problem with the power-emitting device he recalled recently.

The red cannon may be released soon.

By then, this would definitely become a nightmare for the Yuan Dynasty.

...                                                               

At this time, it had been seven days since Huang Fu went to Zhucheng, Mizhou to meet Liu Hongyi.

Of course he has returned to Juzhou.

The soldiers of Zhenguo Military Region under Liu Hongyi were able to all arrive in Zhucheng to meet him.

The army was happy, and Lu Guang, Yin Yongning and other generals arrived.
Chapter completed!