In fact, in Lin Ping'an's concept, the sheepskin used to make hot air balloons should be light and tough, but he didn't take into account that in this era, the production of this kind of sheepskin is very cumbersome, and the most important thing is that it costs money.

So when Liu Yiyi put the hot air balloon drawings drawn by Lin Ping'an in front of Liu Chengzhi, Liu Chengzhi was stunned.

He couldn't help but gasp, and his mouth exploded directly:

"Grandma, where is this to help, this special meow is robbing!"

Liu Yiyi opened her eyes wide and asked curiously:

"Daddy, does this cost a lot of money?"

Liu Chengzhi made a bitter face and spit out a sentence with difficulty:

"It is estimated that it cannot be done without tens of thousands of taels of silver."

At this moment, Liu Yiyi's cherry mouth suddenly opened, his eyes widened, and he muttered:

"But Dean Kobayashi said that this is a trivial matter, and it won't cost a few dollars."

Silly girl, your brain is estimated to have been sold by that kid, and you have to count the money for him...... Looking at his daughter's appearance, Liu Chengzhi let out a series of hehes from his mouth, although he took out the silver, but it was not a small amount after all, the relationship between his daughter and that kid was unknown, it was really a little painful!

The matter has come to this point, you can't give up halfway, if it really can't be done, don't say that Liu Yiyi will become a joke in the academy, and he Liu Chengzhi's old face has no place to rest!

"It seems that girls are outgoing, and they really want to lose money."

He sighed inwardly, waved his hand to the butler, and ordered the matter to continue.

Lin Ping'an naturally didn't know that in the conversation between Liu Yiyi's father and daughter, the production of the balloon had been solved, and the next thing to solve was the combustion system.

In fact, this is not difficult, if you want to use the simple version, then use a large iron pot, put wood in it, and burn it directly, and the heat generated can naturally carry the balloon to the sky.

It's just a bit too rough to do it, and it's not safe enough.

If the fire is too fierce due to strong winds in the air, and the hanging rattan is directly burned, it will be over.

Or if the flame goes out due to rain or other reasons, then you will definitely fall from the sky and fall into a meat dumpling.

So to be on the safe side, Lin Ping'an designed a closed combustion furnace with an air inlet below to ensure the oxygen needed for combustion, and an air outlet above to direct the heat flow to the balloon.

When you want to land, you can gradually close the air intake through the lever to reduce the oxygen entering the combustion furnace, so that the whole hot air balloon can slowly descend to the ground.

As for fuel, in this era, only coal and wood can be used.

Lin Ping'an drew all these things on paper, he now has to go to the Wind Thunder Pavilion to find Lei Zhen for help, if it is an ordinary craftsman, I am afraid that he will not be able to meet his requirements.

In the Wind Thunder Pavilion, Lei Zhen carefully read all the drawings one by one, then raised his head, patted his chest, and said very proudly:

"No problem, within ten days, I promise to get these things ready."

Lin Ping'an nodded, and immediately relieved himself, the core components of the hot air balloon are here, if Lei Zhen said that there is no problem, then the hot air balloon will basically be successful.

The rest is nothing more than hanging the hanging basket carrying people under the burning furnace, according to the current level of craftsmanship of Daming, this kind of hanging basket is not difficult, so under Su Meier's initiative, he handed over the production of the hanging basket to Su Meier.

After Jiang Xingzhou and the four of them listened to Lin Ping'an's arrangement, they all fell into silence.

"I didn't spend half a tael of silver in the academy, so I made this hot air balloon, and the dean is really terrifying!"

The admiration for Lin Ping'an in the hearts of several people suddenly deepened a little.

"After the fifteenth, I will personally show the manned launch of the hot air balloon, and you will see it then."

Lin Ping'an said confidently at the four of them, and there was also a little excitement in his heart.

.

Liu Chengzhi is very powerful, and he didn't give it for nothing, so he soon bought the kind of light, thin, and tough sheepskin, and also found a group of craftsmen who specialize in sewing sheepskin, and worked overtime to make it.

Liu Yiyi wanted to sew by herself several times, but there was really no way, her small hands could hold the embroidery needle, but it would be a little difficult to use this kind of professional sewing sheepskin needle.

So she could only watch the whole time, full of anticipation.

At the same time, in the back garden of Su Liangyong's house, the household servant, it was also a hot scene at the moment.

The hanging basket designed by Lin Ping'an is very large, not to mention standing a few people, even if it is a table of eight immortals, it is no problem.

When Su Liangyong saw that drawing for the first time, his reaction was exactly the same as that of Liu Chengzhi.

At that time, his eyes were round, his mouth was gasping, and he had a toothache.

But there is no way, he is a household servant, and that is also to save face, so he can only grit his teeth and order the housekeeper to handle the whole process, and he must drive out this extra-large hanging basket within fifteen days.

So Su Meier supervised the whole process, and she was very happy, because she finally found something that could be equal to Liu Yiyi.

Unsurprisingly, the news that Lin Ping'an was going to personally demonstrate the manned flight of a hot air balloon after the 15th instantly spread throughout Kyoto, and everyone was looking forward to it, waiting for this day to come.

In Kunning Palace, Zhu Youxiao was very excited, he paced back and forth like a child in front of Zhang Yan, and kept muttering to himself:

"Good boy, you can think of this thing, but why do you use a bamboo basket? That thing is so tasteless, you should at least ask me to build you an octagonal Flying Immortal Pavilion! ”

At this moment, he was like an irritable lion, complaining in his heart that Lin Ping'an didn't let him join in the production of this novelty.

Zhang Yan's eyebrows were picturesque, a smile appeared on her beautiful and vulgar face, she glanced at Zhu Youxiao, who was walking back and forth, and said softly:

"He's just a test flight this time, and when that thing is really successful, His Majesty can build a Flying Immortal Pavilion with his own hands, and the concubine will fly into the air with you, overlooking the whole of Kyoto."

As soon as he heard this, Zhu Youxiao suddenly became overjoyed, he grabbed Zhang Yan's hand, looked at the pretty face that captivated the country and the city, and said with a smile:

"I'd like to put another bed on it, what does the Queen think?"

Zhang Yan's pretty face suddenly turned crimson, she was unbelievably beautiful, she looked around a little anxiously, stomped her feet and said coquettishly:

"Your Majesty, what are you talking nonsense?"

Zhu Youxiao laughed, seemed to think that this was a very interesting thing, and nodded frequently:

"Yes, that's it!"

.

Suning Mansion!

Wei Zhongxian walked anxiously back and forth in the living room like an ant on a hot pot, his face wrinkled together, like the peel of an air-dried orange.

He hadn't slept well for a few days, and Sun Chengzong asked for money again, this time it was a full 500,000 taels.

He believed in Sun Chengzong's character, and even more believed that the other party would not personally send someone to his mansion unless it was absolutely necessary.

The household can only take out 200,000 taels, and there is no more than one tael!

Such a big gap really made him a little embarrassed.

Since the implementation of the industrial and commercial tax, it has indeed brought a lot of income to the imperial court, but for the entire Ming Dynasty, it can only be a drop in the bucket.

And in the whole process of implementation, it was naturally resisted by the collective resistance of those Jiangnan scholars, and Wei Zhongxian even used Jinyiwei and took bloody measures to reluctantly implement it.

The so-called far water can't quench the thirst of the near, and it is impossible for Daming's weak body to recover in a very short time.

For a country, 500,000 taels of silver is nothing, but for this country at the moment, it is a big problem.

"Old man Sun, old man Sun, you are picking the skin of our family!"

Wei Zhongxian muttered in his mouth, the last time Sun Chengzong went to Liaodong, he took away 500,000 taels of silver, and the household department only took out 300,000, and the remaining 200,000 was borne by him Wei Zhongxian, could it be that this time he still counted on him to solve it?

Wei Zhongxian shook his head, although he was nine thousand years old, he didn't have that much silver!

"What should I do?"

He asked himself again in his heart, and suddenly his eyes lit up, and he shouted in his heart:

"yes, how did I forget about this kid?"

Thinking of this, he hurriedly walked out of Suning Mansion and went straight to Lin Ping'an's courtyard.