Arnold's explanation continues.

"The pieces of magecrystal are encased in magecrystal resin, and then the whole is formed into shape, consciously adding more magical power.

"Why is that?"

Gloma Trey interrupted with a question.

"The extra magical power from the forming process causes each piece of the magi crystal to turn in a certain direction.

"That's similar to the crystalline structure being aligned, isn't it?"

Yes. That is the intention."

In short, it is a degraded version of <.

By aligning the direction of the pieces of magecrystal in the magecrystal resin, pseudo-crystallization is performed.

< in a situation where it is not possible to use .

Naturally, it is desirable to use a piece of the same attribute.

Of course, it is a degraded version, so it is much less effective than the real <>.

However, it is several times more efficient than simply using .

"The grade of hardened in this way is in proportion to the quality of the magi crystals mixed inside.

The grade will be about two ranks lower than that of the magical crystals (magicrystals) contained in it.

"That's wonderful!"

It was also Katya who took a shine to the effect.

"I don't know how it was back then, but now you can make a magic crystal (magi crystal) that would cost about one million dollars for one-tenth of that cost. I don't know how it was back then, but it would mean that a magic crystal (magi crystal) that would cost about a million dollars now can be made for a tenth of that.

"So it would be about that much. ...... Well, the size will be quite large, though."

Still, this is an amazing technology!

"Still, it's a great technology!" "There are some drawbacks, though.　It's encased in Magi-resin, so it's vulnerable to heat.

"That depends on how you use it.

In this way, a meaningful lesson in applying technology developed during the war to the present day was given.

"Mr. Arnold, do you have any more?

Cachier is always greedy for cost reduction.

"Well, ......, how about a method of strengthening metal materials?"

"Yes, I'd like to hear about it."

Jin is very enthusiastic about this.

He hoped that if Arnold knew about it, it would not be a common method.

"It is not limited to metals, but if you strengthen the molecular structure, you can make it stronger. There are several ways to strengthen it, but there is one method that was developed during the war.

"Yes."

"It is known that common metals undergo work hardening. It is done artificially, uniformly throughout the metal. But it can only be used for things like armor or the exterior of a golem."

"What is it?"

"We hit the finished product with a small ball of adamantite that we have prepared in advance. The surface will be a little uneven, but it will be hard and scratch resistant.

"...... shot peening?"

"Oh, so Jin knew about this."

"In a manner of speaking."

Shot peening is a type of cold working.

It is a process in which countless hard balls collide with a metal surface at high velocity (these balls are called shots).

The metal surface becomes pear-shaped and lusterless.

However, the hardness of the surface is increased and compressive residual stress acts on the surface, which has an effect on metal fatigue.

In addition, wear resistance and heat dissipation are also improved.

Furthermore, it has a wide range of applications due to its low material dependence.

"So you knew about this too, Jin. That's too bad."

"No, I just know about it. I've never used it."

In fact, he had some knowledge of it as part of his work when he was in modern Japan, but he had never actually processed it.

And even after he was summoned here and became a Magecraft Meister.

"It's of limited use, but I like it."

"Yes. For example, if it can thin the exterior of a golem by 10%, it would be very effective.

Eira and Groma were quickly thinking of ways to use .

* * * * * *

Then, Loa Eisker, the head of the Aerospace Research Laboratory, came running in.

"Mr. Arnold, Mr. Jin!　...... Oh, thank goodness you're here."

"Oh, Mr. Roa..."

"It has just been officially announced that a new propulsion system has been discovered. And that Mister Arnold and Mr. Jin are familiar with it.

Yeah, yeah, well...

If you don't mind, we'd like to talk to them now. I have permission from the High Commissioner.

"...... Oh, I see."

It was hard to say no when he said so.

< was beginning to examine the techniques Arnold had told them about and think about their applications, so Jin and Arnold moved to the .

"You're all very enthusiastic, aren't you?"

"Yes, they are."

"And the and are getting along so well, aren't they?"

"No, they didn't get along with each other until a while ago.

Jin explained the situation to Arnold in a few words.

"I see, that's interesting.

While they were talking, they arrived at the conference room of the Aviation Research Institute.

"Welcome, Mr. Jin, Mr. Arnold.

The main members of the Aeronautical Research Laboratory were all there. Some of them had just met in the cafeteria.

The head of the lab, Roar Eisker, the deputy head, Zora Himmel, Tiner Vito, the red-haired Ena Kouki, and Ciel Azure. After we had been introduced, I asked the group to introduce themselves.

After introducing ourselves once again, we immediately get into a technical discussion.

We all know the principle of rocket propulsion, but this engine is a little different, isn't it?

The normal rocket propulsion system uses a to and then injects the combustion gases to utilize the recoil.

Air-filled balloons and bottles filled with compressed air are used to explain the principle of <>.

However, the one presented here is a little different.

< but .

This is called or in modern Japan.

In ordinary rocket engines, is the important thing, and < is a phenomenon that we do not want to see happen.

However, the <> makes use of <>.

In pure science, hydrogen and oxygen must be pumped into the combustion chamber for the explosion to occur, and this must be carefully controlled.

But what about magic?

<> is a legendary magic, but <> is an intermediate level of fire magic and can be used by anyone who has the aptitude.

In this case, what is exploding is the changed <>. In other words, it does not need <> and does not need oxygen.

In other words, it is compact.

And if it is perfectly controlled by a precise <>, it can be used as a rocket engine. .......

This is the rocket engine introduced in this article.

<