Shen Qingqian was originally engrossed in drawing, but he was suddenly interrupted by him, and he was so shocked that the charred branches in his hands were thrown away.

"Third Brother Cheng, people are scared to death, please make a noise next time you walk?" Shen Qing glanced at him, picked up the branch and continued to paint.

Sheng Ze was a little uncomfortable by her, but he quickly squatted down, looked carefully at the picture on the slate, and after seeing what she was drawing, he blurted out in surprise, "Are you drawing boats?" ”

Shen Qing said without raising his head: "No, I'm drawing rafts, rafts that can run faster in the water." ”

"How do you know this?" Sheng Ze couldn't help but ask.

Shen Qingqian said casually: "It's a fool's errand." ”

Sheng Ze: "...... so you draw so seriously, it turns out that you just draw casually?"

He was suddenly a little disappointed in his heart, but he didn't take his eyes off the slate.

The more Sheng Ze looked at it, the more he felt that it was wrong, where was this girl scribbled, she even marked where it was long and wide!

Sheng Ze couldn't help but look sideways at Shen Qingqian's face, she drew very seriously, and muttered something with her fingers while drawing.

Now Sheng Ze can be sure that she definitely didn't draw casually, and the raft on this picture can definitely be made.

A quarter of an hour later, Shen Qing let out a long sigh and smiled with satisfaction while holding the slate, "It's finally finished." ”

The history of human navigation is long and brutal, first people were inspired by ants on leaves, then people drifted in the water with logs, and then simple rafts, simple boats...... Until modern aircraft carriers.

All they needed now was a raft that could have some security, and compared to those complicated ships, the information in Shen Qingqian's memory could still be made with everything at the moment.

"I'll see." Sheng Ze couldn't wait to take the slate from her hand and looked at it very seriously.

Shen Qingqian didn't stop it, after all, it was up to them to make it.

"Why is there a difference in length here?" Sheng Ze pointed to one place and asked.

Shen Qingqian looked at it and explained: "Because the direction of the resistance of the water will change, the length is different, and the force is different......"

She tried to say it in a language he could understand, and she spoke very carefully.

Sheng Ze kept hearing unfamiliar words from her mouth, but at this time he didn't have time to think about it for the time being.

Shen Qingqian finally finished speaking, and quickly picked up the water bladder and poured a sip of water.

"Adding this to the front will speed up the raft in the water?" Sheng Ze asked, pointing to the fan blade in front of the raft.

Shen Qingqian nodded, "Yes, but it takes someone to keep pulling the rope to control the direction, but I don't know how to tell you this, because it's just my own random thinking." ”

She really didn't know how to explain this two-way spiral fan design principle to an ancient.

In fact, she just added a simple power system in front of the existing raft, and she has minimized the components.

The conditions are limited, this thing is the most suitable and can be made at present, the fan blades are made of branches and flexible enough leaves, and other small parts can be found to be fired in suitable soil, because it is only used once, and there is no need for too strict requirements.

In short, she believes that Cheng San must have a way to do it.

Sheng Ze took the slate and looked at her deeply, "I'll go talk to them." ”

Shen Qingqian hurriedly grabbed him, "Then don't say it's okay for me to draw it?" ”

Sheng Ze's eyes were gloomy, and he nodded after a while, "Okay." ”