On the morning of April 2nd, after breakfast at the Royal Castle of Selroa, Jin and his friends head for .

The time is 8:00 a.m.

"Thank you for everything, Jin-dono. I will bring you a gift later.

"We will come back later for the decontamination experiment. Besides, Makina will be here a little longer.

Both Jin and Makina want ...... materials, not money.

They want to save money, because hoarding money has a negative impact on the economy, but supplies have a smaller impact (but not entirely absent).

"Thank you for your help.

"No, no, I'm sorry for all the trouble I've caused you.

Please come again.

Yes, if I have the chance.

Rorona is also popular with the people of the castle.

Please come again, Mr. Arnold.

"Yes, this place is my home."

And Delphina.

Thank you very much.

I will transfer the expenses for this trip to the academy.

I'll be counting on you.

Thank you all for your hard work.

Thank you very much.

< is a part of the 's duties, the money and expenses are not directly handed over to the three, but are paid to the once.

The then decides on the reward for the three, taking into consideration the reports from the three, and in this case from Jin, Makina, and Arnold.

"Be careful, Jin."

"Yes. Makina, take care of the rest.

"Oh."

With these words, Jin, Reiko, Rorona, Delfina, Arnold, Chell, Kiku Masukawa, Laktato, and Yoh Nowki boarded the hurricane.

"Take care."

The <> begins its slow ascent, watched over by Marcel, the king's brother, and Boigny St. Zekan, Minister of Agriculture and Forestry.

When it reaches an altitude of 200 meters, it moves forward.

After circling slowly over the royal castle as if to say hello, it flew away to the south.

* * * * "Oh, my God!

"Wow, that's fast, isn't it?

"800 kilometers per hour... ......?

About that fast.

Today was a sunny day with a few clouds, so I could really feel the speed of the <>.

Although it was flying at the nominal speed of 800 kilometers per hour, the three <> researchers had guessed that the speed it was going seemed to be supersonic.

It is only natural that they can calculate the average speed if they know the distance between <> and <> and the time required.

(......<> people, you still have to work hard. ......)

Kiku Muskawa, who is from Mitsuho and has heard many legends about , thinks that it would be better not to tell about this.

But he does not.

"Air resistance is proportional to the square of the speed, so it is a big negative factor. If we can devise a way to solve this problem, we can expect to increase the speed with the same engine.

Jin explained to Laktato.

The Egelea native is interested in technology in general.

"I see. ...... streamlining is one of them, isn't it?"

"Yes, yes."

And reducing the number of retractable legs and protrusions as much as possible.

That's what I'm talking about.

Arnold joined in at this point.

Is the aerodynamic drag more negative than a small increase in weight?

"It depends on how much, but I'd say yes.

Jin felt empirically that the weight itself may have a negative effect on acceleration, but its effect on the maximum speed is small.

"I see... ...... So, there is still a possibility to increase the speed even with <>."

"That's true."

Arnold is the head of the <, so naturally he has this kind of interest.

<, he does not yet have a full grasp of all the technology that Horaijima possesses.

Rather, he avoids acquiring such knowledge in a simple way and finds joy in finding it out for himself.

"So that would be ......<>?"

"Oh, that's a good point."

"But covering the whole plane would be harmful, wouldn't it?"

"That's true."

For example, if we cover the aircraft with physical wards, physical attacks from the outside will not be accepted, but also physical attacks from the inside will not be possible.

And of course, not only attacks, but also physical forces such as ...... wind jets, etc. will have no effect.

"Maybe we should deploy it only in front of the aircraft."

"Yes, that's right."

"If it's going to help speed things up a bit, we should avoid covering the entire area."

"Yes."

The <> is a pseudo-air jet that dissipates and reverts to free magic element (ether) soon after it is injected.

Most of the propulsive force is the force that pushes the engine, which is generated inside the engine.

Therefore, it is possible to go forward even if the whole engine is covered with the propellant ......, but the pseudo air that is injected, even for a short time, also contributes to the propulsive force, so it should not be ignored if the maximum speed is to be increased.

Incidentally, when a <> makes supersonic speed, it mainly uses <>, so physical boundaries are not an obstacle.

* * * * * * * * * * * *

Meanwhile, Lorona, Delfina, Kiku Maskawa and others were discussing the soil contamination.

"It looks like the organic mercury was probably done by the Laurentians."

"Is that so? ......"

"Yes. Arnold said they sprayed metal vapors. They sprayed metal vapors.

Mercury is easy to vaporize.

War makes us do stupid things. ......

Yes, it does. That's what I'd like to focus on in this report.

I agree.

With this discussion of technology, the group set out for .

* * * * * * * * * * * * * * * *

< 30 minutes later.

It was 8:40 am local time.

"Wow, it was fast, wasn't it?

"Well, it was fast, wasn't it? At this time of the day, we had plenty of time to prepare.

The group went first to the Chief Superintendent Tomax Bartmann.

They were to report on their return. Jin, Rorona and Delfina greeted the visitors.

"Oh, welcome back. Please ask Manon for more information.

Yes, sir.

Jin-dono, Rorona-dono, Delfina-dono, welcome. I'll leave the rest to Manon.

"Yes, sir."

<.

Jin and the others were shown to the reception room, and Arnold and the three members of the went to their respective laboratories.