"Hot air balloons?"

Chen Du pondered for a moment and asked, "It's not a problem with the hanging basket, but do we have the corresponding materials to make the sphere?" ”

"Normal hot air balloons are made of reinforced nylon or polyester, of course there are none, but we are not going to travel around the world, we don't need such professional things, and thin plastic after Lu Shanshan's weight loss can be." Tang Jing explained.

Chen Du said again, "Then there must be a strong heat source as a driving force, is the level of the three-legged cat of the squad leader enough?" ”

Dong Junwei gritted her teeth on the side.

Tang Jing said, "Although it's a little dish, with our current body shape, it's not impossible." ”

The sound of gnashing teeth is more pronounced.

Tang Jing said again, "However, I don't want to use heat to lift the hot air balloon. ”

"Huh?"

"Although it can be done, the safety performance is too poor and not stable enough, especially since our temperature control is not up to that requirement."

"If you don't need heat, is it still called a hot air balloon?" Chen Du was puzzled.

"As long as you can fly, don't you?"

"Well, what else can be done?"

"This needs to rely on Lu Shanshan." When Tang Jing said this, he didn't continue the topic, but asked Chen Du, "You said before that you can use your ability on gas now?" ”

"It's just a little feeling."

Since the last successful experiment with liquids, Chen Du has been working this aspect, and it is clear that if his ability can really affect the air, the increase in effect will be subversive, especially in combat, it is simply killing people invisibly.

Of course, even if you succeed in changing the shape of the air, you will hardly feel anything, let alone affect anything else.

It's just that Chen Du still tries it every day.

Finally, one day, when he was "generating electricity" into the air, he suddenly felt as if he had grabbed something in his hand.

It was an indescribable feeling, as if the formless, colorless air suddenly took on a substance.

Although that feeling quickly faded, with this success, at least it shows that the road can still be taken.

He immediately told Tang Jing about it.

Tang Jing didn't say anything, just let him continue to try according to his feelings.

Today, Tang Jing suddenly talked about this matter, Chen Du was a little confused at first, but soon understood, "What do you mean...... Lu Shanshan can too? ”

Tang Jing smiled, "If you can reduce the weight of the air, then it can be easily achieved?" ”

"Hydrogen balloons?" Zhao Xiaoyan asked.

Du Jiajiadao; "I heard that the hydrogen balloon is actually filled with helium?"

Tang Jing said, "Normally, it should be like this, but the cost of helium is more than 20 times that of hydrogen, and many businesses will continue to use hydrogen in violation of regulations in order to save costs." ”

"But Lu Shanshan can already lose weight on gas?" Chen Du was a little surprised, even he had just touched on this level, and Lu Shanshan actually walked in front of him?

"We've tried it before, and it's working, but we still need to keep working on it, and the nature of her abilities is different from yours, so we can't compare them, but Shanshan still has a long way to go.

"Let's take hydrogen as an example, its density is 009g/l, and the air is 129g/l, the density ratio of the two is nearly 15:1, which makes the balloon so easy to take off, but Lu Shanshan can only reduce the density by half now, if you want to achieve the same effect, the volume of the balloon will be larger, which is still difficult for us now."

Chen Du nodded after hearing this, "Moreover, I always feel that with our current size, even if we make a hot air balloon, once we fly into the air, a breeze will blow us away, and how to solve the problem of birds?" ”

"I've got an idea for that." Tang Jing said, "Using the abilities of our current people, it can probably be done, but everyone still needs a certain amount of time to grow." ”

The issue of the hot air balloon sparked a heated discussion among everyone, and at the same time, it also aroused the sighs of everyone in Class 4 for Luo Hui.

Soon, the conversation turned back to the conversation.

The container truck was quietly parked by the wall, and Chen Du roughly calculated the amount of work to install tracks and modify the engine.

"Let's get started."

The next few days.

Chen Du was once again so addicted to work that he often brought him lunch because once he got his hands on a part, he had to use the memory of the muscles to continuously consolidate it in a short period of time, and being interrupted in the middle would reduce the efficiency.

"You're working too hard, aren't you?"

He Ying handed the plate containing the food to Chen Dui, who was sitting on the ground, surrounded by various parts of various materials.

"Thank you."

Chen Du worked for a while before he stopped and picked up the plate.

"Don't you wash your hands?"

"Uh-oh."

Chen Du ran to wash his hands, and washed his face by the way, and then came back to pick up the plate and eat.

"Du Jiajia's craftsmanship has improved again." Chen Du swallowed the food in his mouth and nodded constantly.

As soon as he said this, he heard Du Jiajia cheering in the distance, and rushed towards the direction of the gate.

"The cats are here again?" Chen Du chewed on his food and turned his head to the door.

"Twice a day, thunder doesn't move." He Yingdao.

"But I didn't hear the cat's voice."

"You are outdated, Du Jiajia can now perceive Xiao Huang and Xiao Bai in advance." He Ying also had a little envy in his words.

"Everybody's improving." Chen Du sighed.

"Hmm."

"What about you?" Chen Du asked He Ying.

"Me?"

"I see that your speed hasn't improved in the last few days." Chen Dudao.

"Hmm." He Ying nodded, and said with some distress; "It seems like we've reached a bottleneck."

"It's pretty good to hold a tenth of your body weight for five minutes." Chen Du comforted.

"If you don't beat you, it doesn't mean it's enough." He Ying, who had never won once, said fiercely.

"Well, come on." Chen Du didn't care.

There was a cheerful meow outside the door, and then the sound faded away.

Chen Du asked, "Isn't Du Jiajia tired of playing?" ”

He Ying snorted, "How can this be tired, you can go outside for a walk every day, or use the perspective of a cat, you won't get tired of playing for a hundred years." ”

"Will she still be dizzy?"

"It is said that I am used to it, and now Xiaobai can run, and can climb the fence and drill the grass......"

"It's a pity that I still can't control the route." Chen Du interrupted.

"Hehe, that's true, but wouldn't it be too much if it could be like that? Is there anyone else's way to live? ”

"Yes." Chen Du smiled.

Du Jiajia's ability is indeed enviable at present, just this range of activities is far beyond the average person, because the time is still short, Dong Junwei still does not allow others to take the cat bus, which makes Zhao Xiaoyan and others itch and scratch.

He Ying was just about to speak.

Just then, a string of bells rang from the door.

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