Three days passed in a flash, and a simulated robot that looked like Zhao Ci entered the palace as a female medical officer in her place.

After a period of treatment, Cao Xiang also recovered.

He was free of illness, and Princess Binh Duong saw her son recover.

She was very excited and admired Zhao Ci's superb medical skills.

Princess Pingyang prepared a generous gift to thank Zhao Ci, and the gifts she prepared were carefully selected by her.

Princess Pingyang still gave her thousands of acres of high-quality fertile land, thousands of catties of gold, and hundreds of precious jade.

Princess Binh Duong felt that these gifts were nothing compared to her son's life and health.

These were the only things she could get her hands on, like copper coins and other things that weren't worth much.

Zhao Ci did not accept the generous gift, but only accepted a hundred gold, which was regarded as a diagnosis fee.

After all, Liu Zhang and Liu Zhengchen lived in Princess Pingyang's Mansion and spent almost no money.

If she doesn't accept some gifts, Princess Heian will definitely insist on giving her gifts as a thank you.

After thinking about it, Zhao Ci decided to accept only some gold.

At the same time, everyone in the Shang Fang Department was watching the last test of the hot water ball.

If this hot air balloon test is not too problematic, the hot air balloon will be put into use.

After a period of improvement, hot air balloons can provide heat energy by burning coking coal.

Liu Zhang spent several days refining the hot air balloon so that it could change direction.

He designed the parachute, and Liu Che was very supportive of the scientific and technological research of everyone in the Shang Fang Agency.

has also invested a lot of manpower, material and financial resources, which is Liu Che's courage.

Willing to spend money on scientific research, Liu Zhang resented some of his actions.

But they won't send a simulated robot to kill him, after all, Liu Che's existence is still beneficial to the Han Dynasty.

The hot air balloon has two levels, one for the console and one for the bilge.

Some supplies can be stored, and personnel can rest inside.

It's just that there is not much space in the bilge of hot air balloons, and a lot of hot air balloons have been made recently.

It is possible to form a fleet of hot air balloon transports, on which steering rudders are installed.

It's like a hydrogen airship, so you don't let the hot air balloon fly.

Since the equipment of the Shang Fang Department is not as advanced as it is in the 22nd century, it is not yet possible to build a hydrogen airship.

Hot air balloons were good enough for them, at least much more advanced than the equipment of the Huns.

When the spring flowers bloomed, the Han army was about to go on the expedition again.

Send a hot air balloon transport team to the north to fight the Xiongnu, and you can also use hot air balloons to detect and track the Hun cavalry.

There are no attack weapons on the hot air balloon, but you can place some rocks.

It can be thrown from the air, and whether it can be thrown accurately or not, it's hard to say.

Liu Che came to watch the test in person, and of course he hoped that the hot air balloon would not be too problematic.

There were sacks on the hot air balloons with food in them.

The large balloon can accommodate 20 people, and there are balloons of various sizes on the open field.

The small hot air balloon can accommodate five people, and there is a little room left.

Such hot air balloons are mainly used for reconnaissance, and the target is not easy to detect if it is small.

Hot air balloons can only fly up to more than 400 meters, and the improved crossbows used by the Han army can shoot hot air balloons overhead.

And the crossbow in the hands of the Huns could not be shot, and besides, the hot air balloon would not fly above their heads.

Liu Zhang had already explained to them and made some simple telescopes.

The telescope is composed of lenses and bamboo tubes, and the distance and clarity of the telescope are naturally not comparable to the modern telescope in his hand.

This is enough for the Han army used to reconnoiter the enemy's situation, and simple telescopes are still easier to do.

Liu Che wanted to make the plane that Zhao Ci was flying on, but the craftsmen only made the shell.

But he can't fly, although Liu Zhang knows the technology of making airplanes.

But the industrial level of this era is too backward, and it is not so easy to build an airplane.

Being able to make a hot air balloon is the limit of a flying machine, and Liu Che has no choice but to give up.

Invest a lot of money to create something useless, and it is better to spend it on military spending.

Liu Zhang didn't want to make so many good things for him, and wanted to keep himself an absolute advantage.

Yesterday Xuanyiwei was going to take his wife to a secret place and interrogate her.

This made Liu Zhang resentful of Liu Che in his heart, do you want to help Liu Che make some good things?

It all depends on Liu Zhang's mood. I hope Liu Che won't push him to a dead end.

Otherwise, Liu Zhang would take his people to develop on a continent in the west.

Improving the weapon could continue, and he planned to keep a low profile.

In order to prevent the people of the Han Dynasty from being bullied by the Xiongnu, he made some powerful weapons to deal with the Xiongnu.

Liu Zhang only cared about the people of the Han Dynasty, so he didn't care what the emperor wanted to achieve.

His favorability towards Liu Che decreased, and Liu Zhang did not pursue fame and fortune.

He didn't lack anything in his hands, and today he was still so calm.

The hot air balloons are rising into the air one after another, and the hot air balloons are seen getting smaller and smaller.

Hot air balloons have barometric pressure and altitude dashboards that show how high they are flying.

The higher you fly, the lower the temperature, and the less oxygen you have.

"Fabulous! Later, hot air balloons were used to transport grain and grass, and the traces of the Xiongnu could also be detected. ”

Liu Che saw that the hot air balloon was flying quite high, although it was not flying fast.

But it is faster than the cavalry, and the Huns will not be able to take the hot air balloon at that time.

A few hot air balloons chased after it, and the Huns had nowhere to hide.

You can also let Xuanyiwei sit on a hot air balloon, and you can monitor every move of the Honghou Mansion.

What Liu Che could think of, Liu Zhang also thought of, if he dared to do this.

Liu Zhang has a way to shoot the hot air balloon down because he has a lot of drones in his hands.

Drones are naturally faster than hot air balloons and fly higher than hot air balloons.

The Red Marquis Kingdom has become a forbidden area for suspense, as long as Xuan Yiwei is found to enter the Red Marquis Kingdom.

The simulated robot will kill them as many as they send.

The simulated robot is not easy to find, and Liu Zhang is not small to fall out with Liu Che.

He just wants to live a stable life for a while, and then find a way to return to the future with his woman.

The test and success of the hot air balloon, the delivery of some supplies was not affected.

After a long time, the hot air balloon landed on the ground, and the person controlling the hot air balloon reported the situation to Liu Che.

The technology for making hot air balloons is well established, as long as the materials and money are sufficient.

can make more hot air balloons, and Liu Zhang does not discourage more manufacturing.

Anyway, he didn't spend his money, and he wouldn't be greedy for the financial and material resources provided by Liu Che.

If Liu Che hadn't been here, everyone would definitely cheer and clap excitedly.

After such a long period of hard work, I finally succeeded and realized my dream of flying.

"Wonderful! You have succeeded in making a hot air balloon, and you should be rewarded. ”

Liu Che saw the successful launch of the hot air balloon and conducted various tests.

If there is a smooth landing, then it will be much faster to transport grain and grass.

It can also save a lot of consumption of grain and grass, after all, the transportation of horses and cattle and other vehicles is too slow.

It is also limited by the terrain in case of bad weather.

There will be a delay in the delivery time to the destination, and the hot air balloon will be less affected.

Can Liu Che not be happy, this is a sharp weapon to deal with the Huns.

If you look down from above, your view will be much wider.

Liu Che also wanted to feel the hot air balloon take off, but he was afraid of accidents.

"How do you feel in a hot air balloon?"

Liu Che asked them how they felt about making a hot air balloon, and just now they saw that the hot air balloon in the air was getting smaller and smaller.

If you fall from a high altitude, it is estimated that the bones will not be completely broken.

"Back to Your Majesty, sitting on a hot air balloon is like walking on the ground, and there is a feeling of flying."

The person riding in the hot air balloon answered Liu Che's question, and the person in the hot air balloon felt that he was flying

Although not flying like a bird, there are such flying equipment.

It also allowed them to fulfill their childhood dream of going to the sky, to see the ground from above.

It's just a little scared, and many people are afraid of heights.

Living on a hot air balloon and looking down, the view is indeed a lot wider.

It is very clear to see people and other objects on the ground, which is very suitable for reconnaissance of the enemy.

Hot air balloons can fly higher, but according to Liu Zhang's requirements, the flight altitude is only limited to about 400 meters.

Liu Zhang was talking about the length unit of this era, and the hot air balloon had a dashboard.

You can see the height number displayed during the ascent.

After all, Liu Zhang is a highly talented student who graduated from Nanhua Institute of Science and Technology, and it is too simple to make such a thing.

"Your Majesty, since the wishing lantern can be made big and turned into a hot air balloon. The kite should be able to grow big and fly with people. ”

Someone suggested that the kite should be made bigger, so that it would be able to fly in the sky.

Liu Zhang heard the other party say this, isn't that paragliding.

Everyone looked at Liu Zhang, he always had wonderful ideas.

Kites are not as simple as making them bigger, but also consider safety issues.

"Theoretically, the kite is a little bigger. It's okay to fly with people, but safety can't be guaranteed, and huge kites need the help of the wind. ”

It's not difficult to make paragliders, but Liu Zhang doesn't really want to do it.

Engage in these things, and it is easy to have accidents during use.

It's better to spend more effort on improving the hot air balloon, and there is no need to spend money on making those useless things.