Liu Feng, who had finished his 'morning exercise', was eating breakfast in the restaurant with Mina and the others.

The women didn't ask much about Liu Feng's going there all day yesterday, just frolicking and grabbing food as usual, and after eating, they went to go to their own business.

Instead, Allie was idle today and followed Liu Feng and Mina to the study.

"Crunch..."

"You've worked hard these days, it's rare to have free time, don't go around the city?" Liu Feng opened the door and sat in his place, looking at An Li, who was sitting on the side.

"If you don't go, it's still comfortable here for the young master, and I've had enough running around outside these days." Allie flicked her fox's tail and chewed on the small fish she had snatched from Mina's hand.

Mina glared at the side, hiding the small dried fish she had just taken out again.

"You can rest for a few days, it's not a big deal, just order them to do it." Liu Feng opened the drawer and took out a box of lollipops, which he brought from the other side of the earth yesterday.

There are twelve sticks in a box, each of which is transparent, and has a starry sky inside, which is a starry sky lollipop unique to the earth.

"Wow, look good, thank you young master." Allie took the lollipop, and there was no room for anything else in her brown eyes.

Mina glanced at the side, pouted, and didn't say anything, because after her 'morning exercise' this morning, she also got a packet of dried fish, cumin-flavored, which she had already hidden.

"Boom..." there was a sudden knock on the door.

"My lord, I'm Euphie." Outside the door came the voice of the dwarf Ephie.

"Euphie, could it be that there is progress in that thing?" Liu Feng guessed, and then spoke up, "Come in." "

"Crunch..."

"Tread..."

After getting Liu Feng's response, Euphie pushed open the door and walked in.

"My lord." With excitement on her face, Euphie saluted Liu Feng.

"It seems that there is progress, has it already been made?" Liu Feng looked at Youfei with a smile, this was the second time she took the initiative to find herself.

The first time I came I gave myself a big surprise and found a new alloy, so this second time, will there be another surprise?

"Lord, the shell of the Flying Fortress has been prepared, please move and advise." Euphie said excitedly, there was a trace of red blood in those eyes, it seemed that he was working overtime to study during this time.

"So soon?" Liu Feng was surprised, and after seeing the redness in Euphie's eyes and the exhaustion on his face, he knew why it was so fast.

"It's just the shell, the hanging basket and it haven't been installed yet, and the helium hasn't been solved." Euphie looked a little embarrassed and lowered her head slightly.

"You did a good job, as for the helium problem, let me solve it." Praise Euphie, the completion of this shell is much shorter than he expected.

Helium, in fact, is the gas filled in the airship, in fact, hydrogen can also be filled, but hydrogen is flammable and explosive. Helium will not, although helium is more expensive than hydrogen, for safety, Liu Feng finally chose helium as a filling gas.

However, whether it is hydrogen or helium, it will have to wait for Liu Feng to return to Earth to order a machine before it can be produced.

"Let's go, let's take a look." Liu Feng stood up, a little curious about what kind of airship shell Euphie made.

"Good." Mina and Allie nodded, they were also curious, and their hearts were a little excited.

They knew what Euphie was doing, the Sky Fortress, and could take them across the Forbidden Mountains back to the Brutus Kingdom.

The group left the castle and got into the carriage to the scientific research department, and Euphie was a little nervous along the way, this was the first time she had completed a study independently, and it was the sky fortress she wanted to study the most, and she didn't want to make mistakes.

Liu Feng looked at Youfei's hand holding the corner of his clothes, did not say much, and knew the result when he saw the real thing.

"Tread, tread..."

Twenty minutes later, the carriage stopped in front of the gate of the Ministry of Scientific Research.

"My lord, it's here." Outside the carriage came Zinke's voice.

Liu Feng led everyone out of the carriage and walked towards the Sky Fortress Research Institute in the Ministry of Scientific Research.

As soon as he entered the door, Liu Feng's line of sight was filled with an object. In front of him, a large 'rugby' is placed in front of him supported by many wooden frames, all made of new alloy.

And this behemoth is the shell of the sky fortress, that is, the core part of the airship, at a rough glance, the length must be forty meters, the diameter is eight meters, and there are four tail wings in the tail to control the direction, and there is a small propeller at the very end.

Mina and Allie were also surprised, and their eyes circled around the 'big rugby'.

I don't understand how this thing is going to fly, is it the same as a hot air balloon, order fire to fuel?

"Maybe a little bigger." You Fei looked at the expressions of Liu Feng and the others, and said a little embarrassed.

"It's not big, it's a little small." Liu Feng didn't feel big, and it didn't matter if the first test was small.

"Young Master, can this really fly?" An Lihu asked suspiciously.

"Can you or not, you'll know in almost two months." Liu Feng didn't have a bottom in his heart, after all, this was the first time to build an airship, and he had no experience in the past, only a lot of theoretical knowledge.

"Oh." An Li nodded and didn't ask more, since the young master said that he would know after two months, then wait another two months.

"Sir, this is a bleed valve, and then this is the place where the gondola is installed, and the steam engine will be installed here at that time, driving the propeller in the tail to rotate..." As soon as Euphie talked about her field, she began to gush.

The entire airship, in addition to the shell, the most important thing is the deflation valve and propeller, one is to prevent the filling gas from expanding to break the shell, and the other is to control the direction of travel of the airship, which are indispensable things for the airship.

"The rest can be completed in a month and a half, and it will be worse than the adult's helium." Euphie's pink eyes were full of light, something she had always dreamed of accomplishing.

"Within two months, helium should be able to solve it." Liu Feng calculated, he went back to Earth to find someone to buy equipment, and then disassembled and shipped it in batches, two months should be about the same.

"Great." Euphie got excited.

"Okay, it's time for you to take a good rest, don't worry about the rest." Liu Feng said seriously.

"Yes, my lord." Euphie nodded quickly, she really didn't have a good rest during this time, and she also felt tired.

"You can go shopping with Catherine and Lucy, it's not good to stay in the room all day." Liu Feng thought that Catherine and Lucy were staying in the castle during this time, and couldn't help but suggest.

"Yes, my lord." Euphie responded.

。。。。。。。。。。。。。。

"Three more,( ̄▽ ̄). Ask for support. "_

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