Inner city, Fang Mansion.

Although Fang Kaiyue was the second-rank general of the Jinwu Guard, his mansion was not big and was relatively simple and unpretentious, just like him.

Liu Mingqi gently entered the fat man's house and saw a terrible mummy.

Fang Lei was almost wrapped in a rice dumpling, with only one face exposed.

But this kid was pretty energetic. Seeing Liu Mingqi come in, he could squeeze out a smile: "Master!"

Just be able to speak, it proves that you have enough breath.

However, there were also many scratches and swelling on his face, which looked a little weird and terrifying.

“Woo woo woo woo…”

Mrs. Fang, who was sitting next to Fang Lei, kept crying. Even Fang Kaiyue told her that Liu Mingqi was coming, but she did not look back.

All right.

Mrs. Fang has an objection to me, and it’s not a matter of one day or two.

The last time the fat guy fell off a hot air balloon, she was angry once.

Now it's even better. Fang Lei's hot air balloon flew into the sky more than 20 meters, but fell down again.

If there wasn't a forest below, if it wasn't covered with a bear, and with a thick hat on it, Fang Lei and the few people in the hot air balloon basket had already gone to perform a hot air balloon for the King of Hell to take off.

But even so, they were still very injured. Fang Lei was not lucky and was the worst injured.

If Liu Mingqi had not given him a lot of funds and sent many subordinates, a group of people rode on horseback while they were flying, so they arrived at the right time to save them. When they woke up but couldn't crawl, they might not have been able to wait for rescue and would have been eaten by wild beasts that appeared from time to time.

When he was carried back, Fang Lei was still in a coma.

He slowly woke up by disinfecting the wounds with alcohol, bandaging them tightly, and pouring ginseng soup in.

After awakening, Fang Lei kept looking for his master. In no way, Fang Kaiyue sent someone to invite Liu Mingqi.

Liu Mingqi came to him and scolded righteously: "Didn't I tell you to teach your assistants more and let them record various data? Why are you going up again?"

"Master, I don't think about it either, but I really can't help it. I've met you all." The fat man lowered his eyebrows and admitted his mistake, "I will be more careful in the future."

"There is still a future?"

Mrs. Fang was just like last time, and she was furious: "Fang Lei, I tell you that there is no next time! I will burn all the things about you tomorrow!"

When Fang Lei heard that it was so great, he subconsciously wanted to get up: "Mom, mom, you can't do this...ohhhh!"

With such a move, he touched the place where the bones were damaged, and his facial features were distorted.

Mrs. Fang quickly pressed him down, "What are you moving? Ah? I don't know if I'm seriously injured? Lying down!"

No matter how much she scolded her, she saw her son in such pain, tears flowed down again.

"Mom, I'll say a few words to my master. Can you go out first?" Fang Lei said with a bitter face.

"No." Mrs. Fang refused neatly.

“Go out.”

Fang Kaiyue was very open-minded, "If you don't let Xiaolei talk to His Highness, wouldn't he suffer such great suffering in vain?"

"Yeah, yeah!"

Fang Lei nodded repeatedly, but my dad understood me.

The husband and son both had the same opinion. Mrs. Fang had no choice but to get up, but her eyes looked at Liu Mingqi.

At this time, she no longer cared about disrespect. Anyway, this kid was the culprit!

Liu Mingqi definitely won’t care about her as much as she can, and she smiled back to her.

When there were only two of them left in the room, Liu Mingqi said, "Xiao Lei..."

Fang Lei interrupted: "Master, stop talking. I know I'm wrong. Don't care about these small things!"

"No, I want to say that your behavior is very correct."

"oh!?"

Looking at Fang Lei's puzzled face, Liu Mingqi said: "How can a real inventor hide behind himself and not obtain first-hand information in person? Can other people's data and feelings be compared with their own personal experience?"

"Yes!" Fang Lei was very happy, "Master, that's what I think."

"But you still have some serious mistakes." Liu Mingqi said: "Did you ask your assistant to go up by yourself after experimenting a few times?"

"The third time." Fang Lei lowered his voice.

"I'll ask you to go there at least a few times?"

“Five times…”

"What environment should we correspond to?"

"Sunny, cloudy, windy, rainy, snowy."

"What's the weather the two times you had before?"

"Once a day, cloudy. Once at night, light rain."

"What about this time?"

"During the day, it was originally a breeze, but then it became heavier and heavier..."

"Isn't that right?" Liu Mingqi frowned: "You don't even know the most basic environment clearly, so you just go up rashly. Isn't this asking for trouble?

Have I taught you? You have to wait until the conditions are fully ripe before you can do dangerous experiments. Are you considered steady now?"

"No."

Fang Lei shook his head, "I'm sorry, Master!"

He apologized sincerely now.

After thinking about it carefully, Liu Mingqi gave him so many regulations and gave him special instructions, but he was lucky and careless in the end.

Such a consequence would be that one would almost die.

"The environment is ever-changing, and we cannot control it at any time, but in the experimental stage, we should try everything as much as possible to grasp the situation in all aspects." Liu Mingqi continued: "You have already understood now, so don't make the same mistake again next time, otherwise if something happens to you, Mrs. Fang will fight for me."

"Master, you are so nice!"

The little fat man smiled from ear to ear.

Liu Mingqi means that she will continue to pay for him to experiment.

Fang Lei understands how much it is to do a hot air balloon experiment.

With more than a dozen assistants and more than 30 helpers working, the single pay is a considerable expense.

Not to mention the materials he used, and the various costs added up, they used almost tens of thousands of taels of taels.

Fang Lei did not care about the accounts, but the person who was in charge of the accounts was from Prince Yu's mansion, but he also knew that his expenses were as good as a small landlord.

Only rich people like Liu Mingqi who are still interested in inventions can support him to continue making hot air balloons.

Liu Mingqi was a little embarrassed to see Fang Lei so happy.

The little fat man is a typical tool man. No matter what he invented, the one who benefits the most is Liu Mingqi.

As a result, the fat man was grateful to him, as if he had taken advantage of him.

Putting aside his mood, Liu Mingqi said: "When I came, I didn't hear your father explain clearly, how did the hot air balloon fall?"

"well!"

Speaking of this, Fang Lei was upset: "It's because the oil is not strong enough! Although it solved the problem of strong winds and easy extinguishing, the black smoke still rolled, and the gas replenishment of the entire hot air balloon was unable to be improved."

"Well, you need to further refine this to make oil more refined." Liu Mingqi said.

Of course, the word oil was taught to Fang Lei by Liu Mingqi. In the Dakang Dynasty, people had already discovered oil, but it was commonly called "temperature oil".

Because oil is very resistant to burning and is not easy to extinguish, people in remote places usually use it for lighting.

However, because there are too many impurities in oil, it emits extremely smelly black smoke when burning, and it is extremely easy to cause fires, so even the civilians on one side are unwilling to use it.

As a result, very few ordinary residents in the city can access it.

The basic principle of a hot air balloon is thermal expansion and contraction. By combustion, the hot air balloon is filled with gas, so that it can be lifted out of the air.

The first Mongolfie brothers to create hot air balloons in history, the way to let the hot air balloons be launched is to use straw and wood to ignite under the balloons.

Since straw and wood can do it, oil that is more flammable and wind-resistant than them is better.

In fact, hydrogen is better, but not only the trouble of separating hydrogen from it, but also hydrogen is extremely easy to explode and is not safe at all.

Safer liquefied gas also requires harsh conditions in the industrial environment and is more difficult to obtain than hydrogen.

After thinking about it, Liu Mingqi chose the existing oil as fuel.

Now it seems that there are too many impurities in oil and not strong enough heat. Although it can fill a hot air balloon, the combustion effect cannot be guaranteed to be sustained.

Fang Lei nodded seriously: "Okay! I will read the book you wrote in the next few days, and then do it carefully to purify it to see if there is any improvement."

This is the second time that the little fat man has been seriously injured, but he is still infatuated. This spirit of research makes Liu Mingqi admire him.
To be continued...