Li Chengfeng took out a small watercolor pen and a small notebook, and began to write and draw on it.

He was murmured: "The hot air balloon is the lifting force generated by the air burning by the flames! So I have to calculate first what the weight of all of us plus the weight of the bamboo basket, and then how big the hot air balloon needs to be."

"If you do it too small, you may not be able to fly, or fall down halfway through the flight!"

"In addition, the gauze of the hot air balloon needs to be airtight and cannot leak air! So, you need to get some flax oil to apply on it later. This may increase the weight of the hot air balloon again! So it needs to double the original area, so you will be prepared for any eventuality!"

Li Chengfeng said silly, Li Lizhi and Changsun Chong on the side, and they couldn't understand what he was talking about.

The few people were confused. Changsun opened his mouth and wanted to ask, but in the end he still shut his mouth obediently.

Because he knew that this would only make him less knowledgeable, and he was ridiculed by Princess Changle and the Eighth Prince.

"Okay, Sister Changle, Xiao Wu, you need to sew a five-meter-long hot air balloon with needles and threads. And this hot air balloon requires a large area and a small diameter!"

"Ah? Is this so troublesome? What is a large area? What is a small caliber?"

Li Lizhi and Wu Xu were confused.

Unexpectedly, Li Chengfeng’s flying plan was so troublesome.

But that's true, it's not that easy to fly to the sky!

Immediately afterwards, Li Chengfeng drew a prototype of a hot air balloon in a small notebook.

He tore off the page of paper, handed it to Li Lizhi, and said, "Sister Changle, Xiaowu, just follow the model above and start sewing it!"

"Model? Let's take a look. It turns out that it is a big fan, and then it needs to be sewn into a ball?"

"By the way, do you know how to do needlework?"

Li Chengfeng asked with a frown.

Li Lizhi smiled and said, "Of course, who do you look down on Brother Feng'er? As the princess of the Tang Dynasty, I am proficient in piano, chess, calligraphy and painting, and I am proficient in needlework and needlework. This is what my mother learned from me and said that this is a job that a lady must have!"

"Xiao Wu, do you know?" Li Chengfeng turned his head to look at Wu Xu.

Wu Xu nodded slightly and said, "Yes, I have sewed a cotton coat for my mother for winter. Eighth Prince, don't underestimate me!"

"Haha, that's good! Okay, then you guys start sewing according to the sample on this book!"

"Well, OK Eighth Prince!"

Xiao Wu bulged his cheeks and clenched his fists tightly, as if he was cheering himself up again.

Li Lizhi also took a deep breath, then picked up the needle and thread and began to sew the hot air balloon.

Li Chengfeng was not idle either. He was using bamboo strips to weave that huge manned bamboo basket.

Only Changsun Chong stood by and looked around, not knowing what to do.

Because he can't weave bamboo baskets or sew hot air balloons.

Changsun Chong came to Li Chenfeng's side and asked, "This, the Eighth Prince, what's the matter? Do you need the help of Xiaochen?"

"you?"

Li Chengfeng wiped the sweat from his forehead and said, "Oh, if you have something to do, go find me a large jar of pine oil, is there no problem?"

"Pineapple? Eighth Prince, what do you want pineapple to do?"

"Don't ask, I said you don't understand. Anyway, you just do what I said! Could it be that we are busy here, are you idle here? Hurry up and do things for me!"

"This, OK OK! I'll go find pineapple now!"

So, Changsun Chong ran out of the Zhenwang Mansion with a mercy again.

Changsun Chong used his identity and connections in the palace to get some pineapple.

...

When Changsun Chong returned to the town palace with a large jar of pine oil, it was already very late.

Eunuch Wu went to the imperial kitchen and asked the servants to bring eight dishes and one soup, which should be enough for Li Chengfeng and Li Lizhi to eat together.

After working hard for a day, Li Chengfeng wiped the sweat from his forehead and said, "I'm so tired, sister, Xiao Wu, have a meal! We'll be here tonight, let's continue tomorrow!"

"Okay Eighth Prince, let's come here!"

Xiao Wu has been busy for a day, and until night, her face is still red.

Li Lizhi was also sweating all over, and her clothes were soaked.

"I'm back, the eighth prince, I got a big can of pine oil. Do you see enough?"

Changsun Chong came to Li Chengfeng's side with great enthusiasm.

Li Chengfeng took the pine oil from Changsun Chong's hand and said, "It's enough, it's enough, a big jar full of it, it should be enough!"

"Okay, we can have a meal!"

"Yeah, OK!"

...

After dinner, Eunuch Wu suddenly came to Li Chengfeng's side and stammered, as if he had something to say, but he didn't dare to say it.

Li Chengfeng frowned, looked at Eunuch Wu, and said, "If you have anything, just say it, don't hesitate!"

"This is, the Eighth Prince!"

Eunuch Wu said: "The Eighth Prince, according to the servant's response, he said that General Li Yuanba, who was flattering the mountain, wanted to see you and play with you!"

"What? He wants to see me? Play with me?"

Li Chengfeng frowned tightly.

Eunuch Wu continued: "Yes, the Eighth Prince, according to the servant's report, when he went to deliver the meal, where was your uncle still getting angry! What should I do?"

"Oh, he, it's better to wait until I have time in the future and go see him!"

Regarding Li Yuanba's incident, Li Chengfeng actually doesn't want to be related to him.

But after all, Li Yuanba is his uncle, so Li Chengfeng thinks that if you have time in the future, you should visit him.

...

The next morning, Li Chengfeng called Li Lizhi, Wu Xu and Changsun Chong again, and continued to start their flying plan.

"Zhong Chong Chong, in three more days, our flying plan will be successful!"

"Well, okay. I also seem to fly to the sky to see what the outside world is like!"

Li Lizhi smiled happily.

So three days later, a huge hot air balloon stood up in the backyard of the Zhenwang Mansion.

Li Chengfeng ignited the pine oil, and the hot air balloon was exposed to heat and began to expand.

"Come on, come up quickly. If you don't, the hot air balloon will fly away!"

Li Chengfeng said anxiously.

"Okay, okay, let's come up now!"

Li Lizhi and Wu Xu quickly stepped onto the hot air balloon.

Changsun hesitated for a while because he was afraid that Li Chengfeng would cheat him, but in the end, he still gritted his teeth and jumped onto the hot air balloon.

Eunuch Wu was standing aside, stomping his feet anxiously and said, "Eighth Prince, what are you going to make trouble again? Could it be that you really want to fly to the sky?"
Chapter completed!