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"<
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Jin Eira and the others return to the laboratory and begin the review meeting.
The first thing they did was to unify the names.
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"Recently, we've been doing a lot of joint research with the Aeronautics Laboratory," said Rusnar, the head of the laboratory.
Rasnath Heilbronn, the head of the laboratory, told Jin.
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"First of all, ...... special guest, Jin-san, please point out anything you notice."
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Jin opened his mouth, wondering if I was a special guest.
"Well, ...... first of all, kudos to you for the great idea."
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A voice said, "Oh," and there was a round of applause from everyone.
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"And in terms of weight reduction, the fact that it is a barrier using a magic circle instead of a magic tool is also a very good point.
"Oh, thank you. It was Katya who came up with the idea. I was thinking of using a magic tool.
"I see."
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There was another round of applause, and Cachéa turned her head down in embarrassment.
"Next, I was wondering about something. ...... why do they hang the gondolas from the air sacs?
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It seemed to me that if the wind was strong, the air sacs and the gondola would be affected separately, and the gondola in particular would sway and become unstable.
If they were attached directly to the air sacs, they would be more stable, Jin said.
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"Then there's the material."
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We need to consider weight reduction and strength, Jin concluded.
"Well, the gondola hanging from it is a prototype, so it should be ......."
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Eira explains.
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"As Jin said, we don't have to stick to the balloon format, after all, it's still in the experimental stage."
"That's right. Take a look at this."
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Following Eira, Zora Himmel, Deputy Director of the Aeronautics Laboratory, showed us a rough sketch.
The sketches showed a cigar-shaped airship, four air sacs arranged in a square shape, and various other ideas.
Most of them had a cabin instead of a gondola ...... attached directly to the air sacs.
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Let's assume that air weighs 1.2 grams per liter, so to lift a weight of 200 kilograms, we would need 167,000 liters of air sacs. 167,000 liters of air sac capacity would be required to lift a weight of 200 kilograms."
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One liter is one thousandth of a cubic meter, so 16 This means that more than 167,000 cubic meters of air sacs would be needed to lift the 200 kg weight. Of course, the 200 kg weight includes the air sacs and the cabin.
As a side note, 167 cubic meters is a cube with a side of 5.5 meters.
As a side note, a typical 12-foot container for railroad use has a capacity of 18.7 cubic meters.
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Another interesting fact is that the Hindenburg, which exploded and caught fire, had a maximum capacity of 200,000 cubic meters and a total deadweight of about 220 tons. The target was to carry a payload of 1 ton.
"The target is one ton of payload."
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By our calculations, this would require a vacuum air sac with a capacity of 835 cubic meters.
This means that a
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This value shows that the payload per capacity is a bit higher than the Hindenburg (Hindenburg is about 1.1 kg, <
"That size is practical, isn't it?"
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"Yes, that's a reasonable goal for us."
The laboratory is only for development, and commercialization and mass production will be done by another department or an outside company.
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"And what about the propulsion system when it is put to practical use?"
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Jin was curious about this question, so he asked.
"I'm a little worried about that.
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The answer was given by Mr. Lois Eisker, the head of the Aerospace Research Laboratory.
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I would like to use jet thrusters, but they are too heavy.
"That's true."
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Originally, Jin developed the jet thruster for marine use.
If they were to be used for balloons or airships, it is not surprising that their weight would be a problem.
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"I see, so you want a lightweight propulsion system.
Or rather, all the equipment on board should be as light as possible.
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"That's right. ...... I'm not going to be able to do this all in a magic circle style."
"Is that so?"
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What?"
Jin tells Roar Eisker with a resigned look on his face.
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"I think you can use the magic circle method depending on your way of thinking, don't you?
How do you do it?
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"Well, ......."
Since Jin had found the solution, it would be easy for him to explain it, but he thought it would not be good for them.
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So, let me give you a hint first.
"I think that airborne movement is inevitably by wind, but what do you think is the most efficient way to move by wind?"
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"What?"
Roar Eisker was at a loss for words at the sudden question. But Eira answers for him.
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"Well, first of all, you have to keep the wind at bay, don't you?
"That is correct. Then, what shape should the propulsion engine be?
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"Is it a sealed shape?"
"That's right. You can think ...... properly, can't you?"
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"...... maybe you can make the wind blow in one direction in a sealed container ......?"
"Bingo! That's what I'm talking about."
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Jin praised Eira's idea.
This was an idea that took Jin himself many years to arrive at.
Or perhaps it is something that takes longer for those with a background in <
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<
<
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"...... I mean, a hollow cylindrical container closed at both ends with the wind blowing in one direction?"
"Hmmm, that doesn't seem like it would allow for good air circulation, so maybe I should leave it hemispherical at both ends."
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It would be like a hard capsule of medicine.
This kind of thing is possible only with magic, which has <
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Because it ignores the general laws of physics, it is difficult for those who have a taste for science to conceive of such a thing.
In fact, Jin could not have come up with this method 400 years ago.
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"Then, instead of a circular magic circle, why don't you arrange it in a cylindrical shape?
"Oh, Katya, that's brilliant! Yes, that's right!
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Eira jumps at the idea from Katya. They make a good team. Jin was happy to see them.
"But Jin, if we put the magic circle in a sealed container, it will be hard to control it, won't it?"
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"Eira-san, since it is a cylindrical magic circle, you can just carve it on the outside of the capsule."
"Oh, I see. And if we just make the parameters that change the output variable, we can start, stop, and adjust the output.
"Oh, no, why don't we drill a hole in the capsule and open and close that hole manually ...... mechanically?"
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Groma came up with a good idea. The larger the opening, the weaker the thrust, and the more it closes, the stronger the thrust.
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"Now that we've got that much figured out, we're all set, aren't we?"
"Ah! Thank you, Jin!
Jin-san, thank you for the hint!
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You are indeed a Magecraft Meister!
Thus, the "sealed propulsion engine" was born.
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