"Well, now it's finished."

The day after Saki's birthday, on the island of Horai.

While Saki and Goose were investigating the underground spider, Jin was completing .

The old man had heard Jin's mutterings and had made preparations for it, so it was completed quickly.

"It looks the same as Conlon 2.

As Erza said, <> is a that Jin made with the same appearance as <>.

However, there are still many problems to go to space at this stage.

For now, the spacecraft is limited to navigating in the atmosphere ......, although it is questionable whether it can be called a .

The advantages are speed, stability, payload, and safety.

In everyday use, the advantages are the same, but in times of emergency, they make a difference.

In terms of speed, it can reach Mach 5 supersonic speed in the atmosphere.

Unlike the helium-fueled , all levitation and propulsion is performed by .

Normally, passengers board the gondola attached to the bottom of the air sac-shaped hull, but there is actually a cabin inside the hull, which serves as the control room when the craft is going supersonic.

Because of its heavier weight, the stability against winds is much higher. The payload capacity is also increased.

<> was to use it on a daily basis and collect various test data.

On the other hand, the progress of the spacecraft under construction is about 60%.

The ship has already been completed and stands 300 meters in diameter in a huge shipbuilding dock built in the behind the institute.

It is supported by 12 landing legs that expand and contract like a telescope.

They are able to stabilize the hull even when the ground is slightly uneven.

The old man explains to Jin, Elsa, and Reiko who have come to check the propulsion system.

"Yes, I am glad that everything is going well."

"How is the interior?"

Then Reiko quickly responds,

"Father, I will use the force field generator to take you there.

She leaned in close to Jin.

"Well then, ......, will you take care of it?"

"Yes, I'll take care of it!"

Reiko replied and hugged Jin, holding him from behind. She then activated the force field generator.

"Okay, I'm coming!"

"Oh, okay."

"Bye!"

Erza waves him off with a smile, and Jin's body floats softly. Reiko is lifting him up, but it does not feel like she is forcing him.

It is because Reiko has slightly extended the range of effect of the force field generator "Force Generator" to cover Jin's body.

Let's start from the lowest level.

"The bulkheads have not been implemented yet, have they?"

"It seems so."

The floor and ceiling are almost complete, but the lack of walls makes the room look drab.

Jin and Reiko went up to the upper level through an opening where an elevator would eventually be installed.

"This was going to be a warehouse, wasn't it?"

"Yes, it was. We're going to store repair materials, spare magic tools, and so on.

However, there is nothing to see since there is nothing in here.

Jin and Reiko move further up.

"Is this a warehouse too?"

"Yes. But a part of it is supposed to be a hangar for the onboard boats.

That's the one your father built, isn't it?

Yes.

But it's an empty, dreary view. We passed through there as well.

On the upper level, some equipment had been brought in.

"So the water tanks and pantries are on this level?"

"I guess so."

Water is reused after <<>, but there are still losses, and it is not good for one's mental health to reuse sewage for ...... meals, so it is necessary to have more than enough water in stock. So it is necessary to stock more than enough water.

"Also, I'm thinking of building a here."

"A plant factory?"

Yes. We'll be able to harvest fresh fruits and vegetables, and eventually rice and wheat as well.

Self-sufficient.

Well, one meal a day, that's the rule.

Still, there is no doubt that it would be a breakthrough if food could be self-sufficient in a spaceship.

In addition, it would also make use of the carbon dioxide in the air.

After several more levels, Jin and Reiko arrived at the middle level.

<

The voice of the "Great Sage," the brain behind the spaceship's magic, echoes out.

"Great Sage, how are you doing?"

<

Since mithril silver is added to most of the alloys, it is very easy to form a <>.

<<

By understanding the entire manufacturing process, we will be able to give smooth instructions for repairs.

<

explains.

"Yes."

Jin knows the general structure of the building, but this explanation helps him to understand it better.

<<

He also explained the floors we had passed through.

<

"Okay, I'll go to the top then."

<>.

Cubic zirconia is not found naturally, so this time it was imported from the demon territory. In the near future, an attempt to metamorphose and synthesize it from natural zircon will be started in Penglai Island.

"The view looks nice, doesn't it?"

<

Both materials have hardness, toughness, and heat resistance, and the soft magic resin between them can seal even a small hole.

After listening to the explanation, Jin was taken to the top by Reiko.

"Oh, so this is the observation deck.

Through the transparent dome, he can even see the ocean now.

The height of the observation deck is about 320 meters when the height of the landing gear is added.

It is almost as high as the Tokyo Tower, and it is even higher than the Tokyo Tower observation deck.

"I can't wait to see it when it's completed.

"Yes, Father."

Satisfied, Jin descended again and exited the spaceship.

Looking up from below, the spacecraft looks massive.

"Well, then, I guess all that's left is sanitary facilities.

We should think about making the bathrooms and toilets usable even in a weightless state, Jin thought.

"It would be good if we could use air currents for suction," he thought.

Jin had an idea for now, so he decided to make a prototype along those lines.

"The question is, how to test it. ......

"Yes, let's do that. Let's do that."

Jin nodded his head in agreement with the old man. It is important to have a multifaceted view.

The development of spacecraft has just begun.