Chapter 3067: 3067 - - 81-08 Magi rocket engine

Jin, who is independently developing the <>, sees room for improvement in <> magic.

"Earth's rocket engines use heat generated by rapid combustion to expand the air and injectant, but magical explosions don't need <> or <>, do they?"

Jin recognized that <> does not need these physical phenomena.

"In other words, an explosion without heat or light. ......"

"<>, isn't it, father?"

"It would be, but ...... it's a little too dangerous, too special."

<

Reiko can use it, but an ordinary magecraftsman can never do so.

And the risk of miscalculating the control is too high.

One wrong move and the engine itself could explode.

A slight margin of error is acceptable for destructive purposes, but not for use as a propulsion engine.

"First, let's see if we can remove the heat element from the fire bomb."

"Okay."

Jin then used the decompiler to analyze the composition of the fire bomb.

Just as in the past, he found the command to remove the recoil from the wind magic, erased it, and recompiled it. .......

"Well...... I found the command (command) to generate heat because it is a fire magic. However, I think it will not be able to expand the pseudo air. ......"

Jin's analysis of <> seems to follow the process of controlling free magic elements (ether) to temporarily create pseudo-molecular air, which is then diffused by heat: .......

The air molecule seems to return to free magic element (ether) in a few seconds after being injected.

This means that it can be used in places where there is no air ...... such as underwater or in a vacuum without any problems.

"That's good news, but ...... heat is ...... a problem."

Jin thought about the problems with the choice of materials and the heat protection for the other party to which it is attached.

Reiko gives him a word of advice.

"Father, isn't it impossible for an ordinary magician (magecraftsman) to improve magic?"

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

It is, in a sense, Jin's nature (saga) to try to push the envelope in this way, despite the fact that the development was based on the assumption that it was for the general public.

"First, we need to put this method to practical use, and then we will consider one for our own use.

"I think that's a good idea."

So, Jin began to think about physical heat measures.

"Adamantite has surprisingly good thermal conductivity."

Although it is inferior to copper and aluminum, it has much better properties than light silver and iron.

"First of all, should we install heat dissipation fins on the outside of the engine?　...... No. Would it be better to insulate rather than cool?"

Jin decides to test how the engine temperature rise affects the performance.

He uses the same engine as before.

He deployed a physical barrier (solid barrier) to see how the efficiency differs when the internal temperature is raised to 500 degrees Celsius (500 degrees Fahrenheit) and when it is at 0 degrees Celsius (0 degrees Fahrenheit).

Reiko, please.

"Yes, Father. I'll leave it to you.

And the experiment begins.

"Hmmm... ...... almost the same, huh?"

This <> was found to have minimal change in efficiency depending on the ambient temperature used.

"In other words, the <> effect of the <> is probably not very significant."

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This fact will be useful when Jin makes his own <>.

But for now, it's a development for the general public.

"Now we just need to find a balance between power output and heat generation.

So, I decided to check the heat generation when the thrust is kept at 500 km.

Reiko, please.

"Yes, Father."

The resulting temperature was 550 degrees Celsius.

Similarly, when the thrust is limited to 300 kilograms, the engine temperature stabilizes at about 400 degrees Celsius.

"Okay, that's about what I can tolerate."

If the standard thrust is 300 kg, the engine can be made lighter.

"Even if it can withstand double the thrust in an emergency, half the current strength should be sufficient.

The safety factor is well within expectations.

"Now we just need to find a way to make it using heat-resistant steel or high-tensile steel instead of adamantite.

This will lead to cost reduction and mass production.

However, as mentioned above, the thermal conductivity of adamantite is different from that of steel, so it is necessary to keep that in mind when designing.

"And then there's vibration. ......"

Since the explosion occurs at intervals of 0.2 seconds, there is a vibration of 5 Hz.

This would be transmitted to the fuselage and would make the ride uncomfortable.

Since it is difficult to shorten the explosion interval any further, we will try to adjust the ...... resonance so that the vibration does not affect the airframe so much.

"That's good enough for now."

It was late in the evening when we finished verifying most of these values and characteristics.

* * * * * * * *

"It's been a long time since we had a hard time, but we got some good data.

"That's great, isn't it, father?

Reiko was also happy to see the look of satisfaction on Jin's face.

The completed < has two types.

The popular type. Heat-resistant steel is used. It is a steel material containing 33% nickel and 14% chromium.

Nickel and chromium are factors that increase the cost, but the cost is lower than that of adamantite.

The nozzle has a maximum diameter of 20 cm and an overall length of 50 cm to make it easy to handle.

It weighs about 25 kg without the control system and has a maximum thrust of about 1.7 tons (about 16.7 kN). kN).

Note that in Japan, thrust and other < are expressed in N (Newton) or Kgf (kilogram-force or kilogram-force).

For reference, the engines of the F-15 (Eagle), even in its early stages, were capable of producing more than 10 tons of thrust per engine. The engine is for Horai Island.

For Horai Island.

Magi-adamantite is used.

The same size nozzle maximum diameter and length are the same 20 cm and 50 cm, weighs about 40 kg, and has a maximum thrust of 22 tons (about 216 kN). 22 tons (about 216 kN).

This output is made possible by the use of adamantite, which has a tensile strength 10 times greater than that of steel of the same weight.

For reference, the LE-7A engine used in the first stage of the H-IIA rocket has a thrust of It has a thrust of about 1100 kN and weighs about 1.7 tons.

The <>, which weighs less than 1/40th and delivers nearly 1/5th of the thrust, is still excellent.

After this, Jin removed the <> and officially named it the <>.

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